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1.
K. Aitken J. Li L. Wang C. Qing Y. H. Fan P. Jackson 《Genetic Resources and Crop Evolution》2007,54(7):1395-1405
Erianthus rockii, a wild relative of sugarcane, is drought and cold tolerant, and both are potentially important agronomic traits to the sugarcane
industry worldwide. As such it is of interest as a source of parental germplasm to sugarcane breeders and is currently being
used in sugarcane introgression programs in both China and Australia. To date morphological characters have been used to verify
the putative hybrids produced. Two crosses were generated between two different Saccharum species and two E. rockii accessions. Over 400 AFLP markers were used to identify the intergeneric hybrid progeny as well as determine hybrid diversity.
Both crosses generated hybrids but efficiency levels were very different and are probably related to the different Saccharum parent used in each cross. Cross 1 was between a Saccharum officinarum and E. rockii and generated 100% hybrid progeny. Cross 2, however, was between a sugarcane hybrid (S. officinarum × Saccharum spontaneum) and E. rockii and only 10% of the progeny were intergeneric hybrids. Inheritance of markers in the progeny was analysed and for both crosses
there were equal numbers of markers from both parents indicating n + n transmission of chromosomes. This is the first verification of E. rockii hybrids with molecular markers. It may now be possible to exploit genes of value from E. rockii in sugarcane breeding programs. 相似文献
2.
Thomas Nothnagel Holger Budahn Ilona Krämer Edgar Schliephake Edit Lantos Susann Plath Reiner Krämer 《Genetic Resources and Crop Evolution》2017,64(8):1873-1887
Forty-four Asparagus officinalis cultivars, gene bank accessions and breeding lines as well as thirty-four accessions of wild relatives of Asparagus were evaluated for resistance to Asparagus virus 1. Three different test strategies were developed for the assessment of individual plants: (1) natural infection under field conditions, or two vector-mediated infection assays using the green peach aphid Myzus persicae (2) in an insect-proof gauze cage or (3) in a climate chamber. The AV-1 infections were verified by DAS-ELISA and RT-PCR approaches. All tested 660 individual plants of A. officinalis germplasm were susceptible to AV-1 infection. In contrast, in 276 plants of 29 Asparagus wild accessions no virus infection could be detected. These resistant accessions comprised of nineteen diploid, tetraploid and hexaploid species of both the Eurasian clade and the African clade of the asparagus germplasm. Data of the AV-1 resistance evaluation are discussed in relation to the genetic distance of the resistance carrier and potential application in breeding. 相似文献
3.
The genus Nicotiana is a member of the nightshade (Solanaceae) family, and is comprised of 70 currently recognized, naturally occurring species.
Genetic variability within N. tabacum L., the species of primary economic importance, was likely affected by several genetic bottlenecks. Nicotiana tabacum is a classic amphidiploid that arose after chance interspecific hybridization between N. sylvestris Spegazinni et Comes and a member of section Tomentosae, likely N. tomentosiformis Goodspeed, N. otophora Grisebach, or an introgressive hybrid between the two. Only a fraction of the genetic variability that existed in the diploid
progenitor gene pools probably entered into N. tabacum. Genetic drift, coupled with natural and human selection, subsequently resulted in the formation of narrow genetic pools
corresponding to modern commercial market classes. Genetic variability in Nicotiana has gained increased attention in recent years because of investment in Nicotiana genomics research, interest in development of tobacco products with reduced harm characteristics, and concentration on using
Nicotiana species for plant-based production of commercially useful proteins. A storehouse of genetic diversity for N. tabacum is available in approximately 1,900 accessions maintained by the United States Nicotiana Germplasm Collection. Seeds of 224 accessions representing 59 wild Nicotiana species are also maintained. The collection is currently maintained by North Carolina State University and is part of the
United States National Plant Germplasm System (NPGS). The collection’s curator satisfies hundreds of seed requests made annually
by scientists using Nicotiana germplasm for basic biological investigations and by researchers in the area of applied tobacco science. 相似文献
4.
N’Diaye Amidou Noirot Michel Hamon Serge Poncet Valérie 《Genetic Resources and Crop Evolution》2007,54(5):1011-1021
The phenotypic and genetic differentiation between the two related Coffea species (C. liberica Hiern and C. canephora Pierre) was examined. These species differed markedly in terms of leaf, inflorescence, fruit and seed characters. A genetic
map of the interspecific cross Coffea liberica × C. canephora was constructed on the basis of 72 BC1 hybrids. Eighty-three AFLP markers, four inter simple sequence repeats (ISSR) and
five microsatellites corresponding to Coffea liberica species-specific markers were mapped into 16 linkage groups. The total length of the map was 1502.5 cM, with an average of
16.3 cM between markers and an estimated genome coverage of 81%. The two species were evaluated relative to 16 quantitative
traits and found to be significantly different for 15 of them. Eight QTLs were detected, associated with variations in petiole
length, leaf area, number of flowers per inflorescence, fruit shape, fruit disc diameter, seed shape and seed length. Results
on segregation distortion and the under-representation of particular markers were interpreted in terms of genome differentiation.
The implications for the introgression of QTLs involved in advantageous morphological traits (number of flowers per inflorescence,
fruit and seed shape) are discussed. 相似文献
5.
Evaluation of perennial wild <Emphasis Type="Italic">Cicer</Emphasis> species for drought resistance
About 90% of chickpea (Cicer arietinum L.) in the world is grown under rainfed conditions where drought is one of the major constraints limiting its productivity.
Unlike the cultivated chickpea, wild Cicer species possesses sources of resistance to multiple stresses; we therefore evaluated perennial wild Cicer species for resistance to drought. C. anatolicum, C. microphyllum, C. montbretii, C. oxydon and C. songaricum were compared with special checks; C. echinospermum, C. pinnatifidum and C. reticulatum and five cultivated chickpeas. After the cultivated chickpeas were killed, accessions were evaluated using a 1–5 scale, where
1 = highly drought resistant (no visible drought effect and full recovery after three successive wiltings) and 5 = highly
drought susceptible (leaves and branches dried out, no recovery at all). All accessions of perennial wild Cicer species were significantly superior to those annual wild species and the cultivated chickpeas including the best drought
tolerant chickpea, ICC 4958 under drought conditions. Perennial wild Cicer species did not only recover after wilting and drying out above ground level, they also tolerated high temperatures up to
41.8°C. But, they do not cross with the cultivated chickpeas. C. anatolicum should be taken account in long term breeding programs because it has closer affinities to the first crossability group than
the others. 相似文献
6.
Reciprocal crosses were made between Brassica carinata and its related species Sinapis alba. Pollen germination studies indicated the presence post-fertilization barriers in both ways. Sequential ovary–ovule culture
helped to realize the intergeneric hybrids from the cross S. alba × B. carinata. The F1 obtained was confirmed as a hybrid based on morphology, cytology and isozyme studies. The hybrid was backcrossed to its male
parent and obtained BC1 seeds, which were used to raise BC1 generation. The BC1 generation plants were further backcrossed to B. carinata in order to develop alloplasmic lines. 相似文献
7.
Jaime Prohens Gregory J. Anderson F. Javier Herraiz Gabriel Bernardello Arnoldo Santos-Guerra Daniel Crawford Fernando Nuez 《Genetic Resources and Crop Evolution》2007,54(3):451-464
Solanum vespertilio Aiton and Solanum lidii Sunding are endemic, endangered wild species from the Canary Islands. These species are of potential value for eggplant (S. melongena) breeding, given that they are part of the secondary genepool of this crop. We study genetic diversity with amplified fragment
length polymorphisms (AFLPs) markers from 5 populations of S. vespertilio (47 samples) and 3 of S. lidii (26 samples). Five related African species (S. dasyphyllum Schumach. et Thonn., S. delagoense Dunal, S. campylacanthum Hochst., S. panduriforme E. Mey, S. aff. violaceum Ortega) were also included in the analysis. A total of 235 AFLP markers included 178 and 156 that were polymorphic in S. vespertilio and S. lidii, respectively. Analysis of genetic distance, phenograms, and principal component plots showed that these rare Canarian species
are differentiated (G
ST = 0.412) from the continental materials and that Solanum vespertilio is more distinct to its African congeners than is S. lidii. There is a relatively high level of differentiation between the two species (G
ST = 0.373), that presumably reflects geographic restrictions (S. lidii to Gran Canaria; S. vespertilio essentially to Tenerife). However, both species have similar levels of total diversity. We speculate that the combination
of the many unusual reproductive features (andromonoecy, zygomorphy, heteranthery and weak enantiostyly in S. vespertilio) help explain genetic diversity that is high for self compatible species. The high genetic diversity may also indicate populations
were larger in the past. A decrease in population size could contribute to the relatively low genetic differentiation among
the populations. The data presented herein provide the foundation for initiation of ex situ and in situ conservation programs
for these wild relatives of eggplant.
This paper is dedicated to the memory of Dr. Richard N. Lester, who made significant contributions to the taxonomy, biosystematics
and conservation of genetic resources of African species of Solanum. 相似文献
8.
Agromorphological and molecular variability in the genus <Emphasis Type="Italic">Sesbania</Emphasis>
Green manuring especially in rice wheat cropping systems of many tropical and subtropical countries is regaining importance
due to increased fertilizer costs and environmental considerations. Many species of Sesbania genus have been reported as potential green manure crops. The genus is not well characterized and there is a lot of ambiguity
over the nomenclature and classification of the species of this genus. A pilot study based on agro-morphological and molecular
data was conducted to examine the interspecific and intraspecific variability in the selected species of Sesbania genus that were collected from diverse geographical locations and are recommended or traditionally used as green manures.
The study revealed a lot interspecific variability at both morphological and molecular level. It was also shown that species-specific
genetic markers could be generated. The potential use of such markers in Sesbania breeding program is discussed. The study also emphasizes the utilization of molecular profiling for proper identification
and classification of the species of this genus. In addition, various limitations in breeding and utilization of Sesbania as a green manure crop and the potential of a radiation induced late flowering mutant (Trombay Sesbania rostrata-1; TSR-1) for crop improvement is also discussed. 相似文献
9.
N. P. Goncharov S. V. Bannikova T. Kawahara 《Genetic Resources and Crop Evolution》2007,54(7):1507-1516
The effective utilisation of available genetic resources of related species is essential for successful crops breeding and
maintaining genetic variability within crops. Bread wheat, the basic cultivated wheat species, is an amphiploid (2n = 6x = 42) and, therefore, the production of new synthetic amphiploids using genomes of related species should reduce the difficulties
caused by direct crossings, for example, between hexaploid wheat and diploid relatives. Hence, exploiting synthetic amphiploids
is an effective and rapid way of introgressing desirable traits from related species into cultivated wheats. Some of the artificial
amphiploids that already exist were produced 80 years ago. Yet little work has been done to highlight potential contamination
and/or genetic changes during their conservation by genebanks. Thus, we utilised the electrophoresis of wheat endosperm storage
proteins (gliadins) to check such amphiploid authenticity, and also where differences had been previously observed between
synthetic wheat amphiploids. In addition, we checked putative amphiploid accessions where Triticum timopheevii (GGAtAt) was recorded as one of the parents. A synthetic species, T. timococcum produced by Kostov, together with a natural T. zhukovskyi found in Georgia (the former Soviet Union) were revealed to be identical according to our assays. The existence of several
T. kiharae accessions independently produced by different authors was confirmed, and they exhibited polymorphism for a number of traits,
including spike characters (awning, hairy glumes) and growth habit (spring vs. winter). The effective conservation of artificial
amphiploids in genebanks is discussed. 相似文献
10.
C. Toker 《Genetic Resources and Crop Evolution》2005,52(1):1-5
The study was aimed to select cold tolerant accessions of annual wild Cicer species in the highlands in the west Mediterranean area of Turkey. A total of 43 accessions of eight annual wild Cicer species was screened for cold tolerance and compared with the best cold tolerant cultivars, ILC 8262 and FLIP 93-53C. After the sensitive check, ILC 533, was killed, accessions were evaluated using a 1–9 scale. Three accessions of Cicer bijugum, 2 accessions of Cicer reticulatum and 2 accessions of Cicer echinospermum were highly cold tolerant, while 3 accessions of C. bijugum, 9 accessions of C. reticulatum, 2 accessions of C. echinospermum and 1 accession of Cicer pinnatifidum were cold tolerant. All accessions of Cicer judaicum were sensitive to cold. Whereas Cicer chorassanicum and Cicer cuneatum were killed, Cicer yamashitae was recorded as highly sensitive to cold. The cold tolerant accessions of annual wild Cicer species were superior to the best cultivar as far as hardiness is concerned. 相似文献
11.
Genlou Sun 《Genetic Resources and Crop Evolution》2007,54(8):1737-1746
Elymus trachycaulus complex species are known for their morphological variability, but little is known about their genetic basis. The phylogenetic
relationships among the E. trachycaulus complex, and their systematic relation to other species in Triticeae remain unknown. Nucleotide diversity of ribulose-1,5
bisphosphate-carboxylase (rbcL) gene in E. trachycaulus complex species and several other Triticeae was first characterized and compared. A primary conclusion of the present study
is that nucleotide diversity for rbcL gene in E. trachycaulus species was detected with the estimates of nucleotide diversity θ = 0.00039 and π = 0.00043. The estimate of nucleotide diversity
in rbcL gene for species with different genome constitution here ranged from 0.00099 (π) and 0.00099 (θ) for the species with Ns
genome to 0.00226 (π) and 0.00291 (θ) for the species with St genome. The phylogenetic relationships of these species were
assessed using these rbcL sequences. A total of 47 variable positions including 19 parsimony-informative sites were detected among 24 accessions of
18 species/subspecies. The species with St, H/I and Ns genomes well separated from each other, and formed a three distinct
clades with higher bootstrap values support for both Parsimony and NJ analyses. The St genome containing species is sister
group of H/I genome containing species. Our result confirms that Pseudoroegneria is the maternal genome donor to these Elymus species studied here, regardless of their distribution. Elymus trachycaulus complex are more related to each other than to E. glaucescens, E. patagonicus, and E. solandri. This study suggested that Elymus species with StH genomes may form from multiple closely related sets of donors. 相似文献
12.
Hirut Kebede Gloria Burow Raviprakash G. Dani Randy D. Allen 《Genetic Resources and Crop Evolution》2007,54(4):885-895
Since Upland cotton (Gossypium hirsutum) is known to have relatively low levels of genetic diversity, a better understanding of variation and relationships among
possible sources of novel genes would be valuable. Therefore, analysis of genetic variation of the genus Gossypium, especially the diploids, which are the putative donors of the A and D genomes for the commercially important allotetraploid
cottons (AADD), G. hirsutum and G. barbadense, could provide important information about the feasibility of using these genetic resources for cotton improvement. The primary
objective of this study was to analyze the genetic diversity in A-genome diploid cotton species, G. herbaceum (A1) and G.␣arboreum (A2) by using microsatellite markers. Forty-one A-genome germplasm accessions were evaluated with 32 microsatellite loci.
Genetic similarities between A1 and A2 ranged from 0.62 to 0.86 with a mean of 0.70. Within each A-genome species similarities
ranged from 0.80 to 0.97 with a mean of 0.89 for A1 and from 0.82 to 0.98 with a mean of 0.89 for A2. A UPGMA tree and principal
coordinate analysis based on genetic similarity matrices showed distinct clusters consistent with the genomic groups. 相似文献
13.
Bettina Heider Elke Fischer Tanja Berndl Rainer Schultze-Kraft 《Genetic Resources and Crop Evolution》2007,54(3):529-542
Pueraria montana var. lobata and P. phaseoloides originating from tropical Asia and parts of Oceania are ecologically and economically important legumes that are used as
green manure, cover crop or forage plants. Conservation and use of plant genetic resources require an understanding of the
extent and distribution of genetic diversity in any given region. In this study, genetic variation of five P. montana var. lobata and 16 P. phaseoloides accessions was analysed developing a random amplified polymorphic DNA (RAPD) marker methodology for Pueraria species and thereby creating basic data for follow-up research and the development of conservation strategies. Seeds were
collected from native populations in Bac Kan Province, a mountainous region in Northeast Vietnam. P. montana var. lobata presented a high level of variation with 54.3% of the detected markers being polymorphic, whereas P. phaseoloides exhibited an intermediate to high level of variation (45.5%). The P. montana var. lobata accessions clustered in congruence with their eco-geographical origin. For P. phaseoloides no correspondence between sampling sites and genetic differentiation was found. Inter-population differentiation was measured
as Jaccard's similarity coefficient (JSC). Mean JSC amounted to 0.35 in P. montana var. lobata and 0.52 in P. phaseoloides. Results are compared to other genetic studies of herbaceous legumes and conservation strategies are suggested. 相似文献
14.
Nidhi Rawat Vijay K. Tiwari Neelam Singh Gursharn S. Randhawa Kuldeep Singh Parveen Chhuneja Harcharan S. Dhaliwal 《Genetic Resources and Crop Evolution》2009,56(1):53-64
Grains of 80 accessions of nine species of wild Triticum and Aegilops along with 15 semi-dwarf cultivars of bread and durum wheat grown over 2 years at Indian Institute of Technology, Roorkee,
were analyzed for grain iron and zinc content. The bread and durum cultivars had very low content and little variability for
both of these micronutrients. The related non-progenitor wild species with S, U and M genomes showed up to 3–4 folds higher
iron and zinc content in their grains as compared to bread and durum wheat. For confirmation, two Ae. kotschyi Boiss. accessions were analyzed after ashing and were found to have more than 30% higher grain ash content than the wheat
cultivars containing more than 75% higher iron and 60% higher zinc than that of wheat. There were highly significant differences
for iron and zinc contents among various cultivars and wild relatives over both the years with very high broad sense heritability.
There was a significantly high positive correlation between flag leaf iron and grain iron (r = 0.82) and flag leaf zinc and grain zinc (r = 0.92) content of the selected donors suggesting that the leaf analysis could be used for early selection for high iron
and zinc content. ‘Chinese Spring’ (Ph
I
) was used for inducing homoeologous chromosome pairing between Aegilops and wheat genomes and transferring these useful traits from the wild species to the elite wheat cultivars. A majority of
the interspecific hybrids had higher leaf iron and zinc content than their wheat parents and equivalent or higher content
than their Aegilops parents suggesting that the parental Aegilops donors possess a more efficient system for uptake and translocation of the micronutrients which could ultimately be utilized
for wheat grain biofortification. Partially fertile to sterile BC1 derivatives with variable chromosomes of Aegilops species had also higher leaf iron and zinc content confirming the possibility of transfer of required variability. Some of
the fertile BC1F3 and BC2F2 derivatives had as high grain ash and grain ash iron and zinc content as that of the donor Aegilops parent. Further work on backcrossing, selfing, selection of fertile derivatives, leaf and grain analyses for iron and zinc
for developing biofortified bread and durum wheat cultivars is in progress.
Nidhi Rawat, Vijay K. Tiwari, and Neelam Singh have contributed equally to the work. 相似文献
15.
16.
Plant breeders are interested in strawberry species as donors of volatile compounds in breeding programmes because of the
diversity and intensity of wild strawberry aroma. Therefore, the topic of this paper is the prospective analysis of four accessions
of four wild strawberry accessions in comparison to a standard cultivar of Fragaria × ananassa Duch. by using human sensory, gas chromatography mass spectrometry (GCMS) and gas chromatography–olfactometry (GCO). The
wild species have higher aroma intensities compared with the cultivated one. The flavour quality differs significantly. Semiquantitative
GC analysis revealed that F. × ananassa cv. ‘Elsanta’ has the lowest content of volatile compounds whereas Fragaria moschata L. ‘Cotta’ has the highest. The aroma impressions, measured by GCO, support the findings of GCMS analyses. The nasal impact
frequency (NIF)-profiles of the wild types are more manifold and of higher intensities than those of the cultivated F. × ananassa cv. ‘Elsanta’ which corresponds with the overall flavour impression when tasting the fresh fruits. 相似文献
17.
Total 65 lotus accessions in genus Nelumbo mainly collected from China, were subjected to random amplified polymorphic DNA (RAPD) markers to estimate the genetic diversity
and to test the genetic basis of the relationships between morphotypes and molecular markers. Seventeen primers generated
a total of 195 highly reproducible and discernible loci, among which 173 were polymorphic. Percent polymorphism varied from
66.7 to 100 with an average of 88.72, and five primers out of them, OPC05, OPG10, OPN20, OPP09 and OPS17, showed 100% polymorphism.
A relatively high genetic diversity was detected among all the samples with the similarity coefficient values ranging from
0.45 to 0.85, and Nei’s gene diversity (h) 0.30, and Shannon index (I) 0.46. The UPGMA dendrogram clustered 65 accessions in four clusters and the clustering pattern showed two groups, N. nucifera ssp. nucifera and those accessions related to the American lotus, and some special cultivars, landraces, hybrids and the American lotus.
Principal Coordinate Analysis (PCA) further indicated that the genetic diversity of Nelumbo accessions was not evenly distributed, instead, was presented by a clustered distribution pattern. Similar to the results
revealed by the dendrogram, two main groups representing the two subspecies of N. nucifera, as well as some special landraces, cultivars of Chinese lotus, the Japanese lotus and hybrids out of the two groups were
obtained. Neither the UPGMA dendrogram nor the PCA analysis exhibited strict relationship with geographic distribution and
morphotypes among the accessions. 相似文献
18.
Daria Ryabova 《Genetic Resources and Crop Evolution》2007,54(5):973-980
Many crop wild relatives are usually widely distributed species, and in this relation a question arises about selecting populations
of special importance for conservation. Using Rubus idaeus as an example, we propose a compound selection of wild populations for in situ conservation. Twelve raspberry populations
in the Leningrad region have been evaluated from the point of view of their significance for in situ conservation. To exclude the run-wild forms from the evaluation process, we tried to identify them applying a mathematical
model developed by statusmetry method. The constructed model is based on morphological features of leaves of primocanes and
helps to distinguish the wild forms from the cultivated and run-wild ones. The wild raspberry populations were screened for
plants with features useful for cultivated raspberry improvement such as waxy cover presence, yellow fruiting plants, spinelessness,
fruiting primocanes and others. The diversity of wild raspberry populations was assessed by variation of morphological features,
presence of botanical varieties and polymorphism of seed storage proteins. The results of viability status assessment for
the chosen populations reflect the perspectives of their development and permit to determine the strategy and measures for
optimal conservation. 相似文献
19.
M. C. Vaz Patto M. Fernández-Aparicio A. Moral D. Rubiales 《Genetic Resources and Crop Evolution》2007,54(7):1517-1521
Several Lathyrus species have a considerable potential as alternative pulses in sustainable dryland farming systems mainly due to their high
tolerance to drought and disease resistance. Powdery mildew is a serious disease affecting several Lathyrus species. Little is known on the availability of resistance and the underlying resistance mechanisms against powdery mildew
in the Lathyrus genus. The present study assessed and characterized the resistance reaction to powdery mildew, Erysiphe pisi, in a collection of Iberian Lathyrus cicera accessions. In general, a compatible reaction with no macroscopically visible necrosis was observed but accessions with reduced
disease severity despite of a high infection type have also been identified. This Partial Resistance was in some accessions
only expressed in the adult plant stage. The controlling genes of the Lathyrus resistance mechanisms can be of great interest not only for the Lathyrus improvement per se but also for related legume species, like field pea. 相似文献
20.
Naod Beteselassie Chemeda Fininsa Ayele Badebo 《Genetic Resources and Crop Evolution》2007,54(2):337-343
Seedlings of 41 emmer (Triticum dicoccon Schrank) and 56 durum (T. durum Desf.) wheat accessions were evaluated for their response to stem rust (Puccinia graminis f. sp. tritici) infection under greenhouse condition at Kulumsa Agricultural Research Center, Ethiopia. The objectives were to identify
tetraploid wheat accessions that could serve as sources of resistance to stem rust, and postulate the stem rust (Sr) resistance genes through multipatotype testing. The test included screening of accessions for stem rust resistance and multipatotype
testing. To ensure vigorous screening, a mixture of six isolates (Si-1a, Am-2, Ku-3, Dz-4a, Ro-4 and Na-22) that were collected
from severely infected emmer, durum, and bread wheat (Triticum aestivum L.) varieties of major wheat growing areas of Ethiopia was used as inocula. Out of the tested accessions, 18 emmer and 6
durum accessions exhibited low infection types (0–2) response and hence selected as a source of resistance to stem rust infection.
Multipatotype testing was done to postulate Sr genes in the selected accessions. In the test, 10 different stem rust races (A2, A9, A11, A14, A16, A17, B3, B7, B15, and
B21), 33 stem rust differential lines, and a universal susceptible check variety, Morocco were used, The high (3–4) and low infection type reaction patterns of the tested accessions and differential lines were used
to postulate the genes that exhibit gene-for-gene relationship. The presence of Sr 7b, 8b, 9a, 9b, 10, 14, 24, 27, 28, 29, 30, 31, 32 and Tt-3+10 genes were postulated in 16 selected emmer and 5 durum wheat accessions. Efforts to transfer these valuable Sr genes from cultivated tetraploid wheats could be rewarding to get stem rust resistant varieties and boost wheat production. 相似文献