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1.
W. D. Branch 《Plant Breeding》2002,121(3):275-277
The objective of this study was to compare the variability among advanced large‐seeded ‘Georgia Browne’ mutant breeding lines induced by γ‐irradiation. Seeds of the small‐seeded, high‐yielding, disease‐resistant peanut cultivar ‘Georgia Browne’ were exposed to a 200 Gy dose of γ‐radiation. Several advanced (M6:7–M6:9)‘Georgia Browne’ mutant breeding lines were developed and evaluated at the University of Georgia, Coastal Plain Experiment Station over three consecutive years 1997‐99 for disease incidence, pod yield, total sound mature kernels (TSMK) grade, pod weight, seed weight and seed size distribution. Field performance tests showed significant differences among the advanced large‐seeded mutant breeding lines compared with ‘Georgia Browne’ for each of these variables. The results obtained demonstrate the beneficial use of mutation breeding for inducing and developing variable and desirable advanced mutant breeding lines within peanut cultivars.  相似文献   

2.
In British Columbia, Lucerne stand persistence is reduced by inadequate disease resistance, winter hardiness, or both. We evaluated the possibility that persistence could be improved by sowing mixtures of winter hardy and verticillium wilt (VW) resistant cultivars. Our hypothesis was that dry matter yield of mixtures of two Lucerne cultivars could be calculated simply from the proportion of each cultivar in the mixture and their yield in pure stand. A winter hardy cultivar, Beaver, was grown in mixtures with each of three VW (caused by Verticillium albo-atrum Reinke & Berthier) resistant cultivars (WL316, Sparta, or Barrier) in proportions of 0, 0.25, 0.5, 0.75, and 1.0. The yield of a mixture of two cultivars could be calculated from the proportion of each cultivar in the seed mixture and their yields in monoculture. In the absence of a winter where severe injury to Lucerne stands occurred, the VW-resistant cultivar Barrier yielded about 2 t ha−1 year−1 more than the more winter hardy Beaver.  相似文献   

3.
Over the course of two planting seasons field trials were conducted at the CIAT farm in Palmira (Colombia). The experiments included nine tropical bean lines grown in pure stands and seven mixtures obtained by combining these lines on the basis of equal proportions in seed number.
In the case of several pure lines, inferior seed quality led to low germination and uneven population densities, especially in the first planting season. Analogously, missing plants also occurred with the corresponding mixtures. A significant and positive relationship between mixing induced yield gains and patchiness in mixtures was found, indicating that intergenotypic compensation was a major determinant for mixture effects on yield. In common bean as a tropical subsistence crop seed quality is known to be erratic. It is concluded that compensation effects in mixtures of common bean may be expected to be of practical importance regarding the improvement of yield stability over seasons.  相似文献   

4.
W. Erskine 《Euphytica》1977,26(1):193-202
Summary Six pure lines and four mixtures were grown in six environments throughout lowland Papua New Guinea. There were no significant transgressive increases in the grain yield of mixtures above their pure line components, and mixture yields were adequately predicted by the mean of components. In yield stability it was found that the individual buffering of pure lines was of more importance than population buffering, and that the magnitude of population buffering varied with the particular combination of components. Competitive effects in all the mixtures were of the compensating type. Dramatic changes in mixture composition resulting from natural selection precluded their use in local agriculture. The outcome of competition in mixtures was strongly influenced by the growing environment, such that selective index was correlated to general fertility.  相似文献   

5.
The effects of row spacing (17.5 or 35.0 cm), support plant species (barley or triticale) and the proportion of crops in mixtures (no support plant or support plant 20, 40 or 60 %, respectively) on the seed yield and yield characteristics of Hungarian vetch (Vicia pannonica Crantz) were investigated. Increasing the row spacing increased the seed yield of V. pannonica from 881.0 to 1248.0 kg ha?1. On average, in a pure stand the seed yield of V. pannonica was 1141.0 kg ha?1. In mixtures with barley and triticale, the seed yield of V. pannonica averaged 986.0 and 1143.0 kg ha?1, respectively. In single mixed stands the seed yield of V. pannonica varied between 551.0 kg ha?1 (60 % support plant barley) and 1603.0 kg ha?1 (20 % support plant triticale). The yield advantage of V. pannonica in this triticale mixture was 40 % compared to the V. pannonica pure stand. With respect to the total yield in the mixture with 20 % triticale (1902.0 kg ha?1) the yield advantage over the V. pannonica pure stand was as high as 65.1 %. In the mixed stands the number of seeds per pod and the thousand‐seed weight of V. pannonica were higher than in V. pannonica pure stands.  相似文献   

6.
A. G. Agorastos  C. K. Goulas 《Euphytica》2005,146(1-2):117-124
Summary Pure line selection for grain yield applied within four durum wheat local landraces (Triticum turgidum L. var durum) was studied in an effort to determine: (i) the agronomic performance of selected line mixtures (bulks) and their value as potential new cultivars, (ii) the effectiveness of pure line selection for grain yield within local landraces and (iii) the correlated selection response of yield components and kernel quality traits. Four local durum wheat landraces were used. Two of them, Mytilini-1 and Mytilini-2 are still cropped in some rural areas of the island Mytilini whereas the other two, Limnos and Mavragani are maintained in the Greek Gene Bank. Following their preliminary evaluation for agronomic performance under current growing conditions, 100 individual plants from each landrace were randomly selected. Selected plants (pure lines) were field evaluated head to row during 1997–98 and 1998–99 growing seasons. Based on grain yield performance, bidirectional selection, high vs low, was practised within each landrace. Thus the five higher yielding lines and their corresponding lower ones from each landrace were identified. Selected lines, with no further progeny testing, were pooled using a balanced seed composite to form the high yielding five line bulk and its respective low counterpart. The resulting 16 bulks (eight high and eight low) along with their four source landraces and two commercial varieties, Mexicalli and Simmeto, used as checks, entered field testing for agronomic performance in two and one location during 1999–00 and 2000–01 growing seasons respectively. Data for grain yield and yield components (1000 kernel weight, number of kernels, and productive tillers) along with kernel quality data (protein content and vitreous) were recorded. Data for grain yield indicated that the landraces studied seemed to be line mixtures, as expected, since they responded to bidirectional phenotypic pure line selection. The high yielding bulks were of interesting agronomic performance, equivalent to or significantly better than that of the commercial checks and are worth further testing as potential cultivars. Selected high bulks of Mytilini 2 landrace significantly outyielded both the source landrace and the commercial checks maintaining the high protein content of the source landrace, which was significantly higher than checks. This performance provides evidence that the within landraces selection of lines combining high grain yield with high protein content seems to be feasible. In conclusion, evidence is presented that genetic variability seems to be available within the landraces studied which could be worth using in breeding programs. Furthermore the simple pure line selection breeding effort undertaken seemed to be effective in developing line bulks with promising performance and worth further testing as potential cultivars.  相似文献   

7.
The combining abilities for physical-quality traits in peanut were examined to understand the type of gene action governing these traits, and to identify peanut genotypes suitable for use as parents in breeding for quality improvement. The F1 hybrids including reciprocals from a six-parent diallel cross along with the parents were evaluated in a randomised complete block design. Data were recorded on five quality traits in peanut viz., shelling outturn, 100-pod weight, 100-seed weight, Count and proportion of sound mature seeds. Substantial genetic variability was observed among the hybrids for the traits studied. Diallel analysis indicated that expression of majority of the quality traits is regulated predominantly by additive gene action suggesting possibility of early-generation selection, while non-additive gene action also plays an equally important role in the control of seed size. Significant reciprocal effect for all the traits denoted role of maternal parent in the expression of quality traits and importance of parental selection in quality breeding. Genotypes ICGV 86564 and TPG 41 were good combiners for seed size, while J 11 was a good combiner for improvement of shelling outturn and proportion of mature seeds. Association between general combining ability (GCA) effects and mean performance suggested that the performance per se of the genotype should be a good indicator of its ability to transmit the desirable quality attributes to its progenies. Though performance of crosses was found to be independent of parental GCA status, it is evident that at least one of the parents used in hybridisation should have large pods and seeds for obtaining better segregants.  相似文献   

8.
以不同粒重的花生种子为试材,采用不同播种方式,研究粒重大小和播种方式对花生生长发育、光合特性及产量的影响。结果表明,单粒精播处理可使产量增加,与传统双粒穴播相比,在一垄两行播种方式下,相对大粒种子和相对小粒种子分别增产9.77%、4.19%;一垄单行种植方式下分别增产3.44%和2.77%。无论种子粒重大小,单粒精播处理的主茎高、侧枝长和地上部干物质积累量均显著高于双粒穴播,但其荚果干重、净光合速率和单株叶面积与双粒穴播间均无显著差异。相关分析表明,叶片干重、茎柄干重与单株叶面积间呈极显著相关关系;饱果成熟期与结荚期地上部干物重之差与产量间呈显著相关关系。采用垄作双行单粒精播模式,选用饱满粒重较小的种子,可达节本降耗、明显提高经济效益的目的。  相似文献   

9.
为配合福建企业开发马拉维花生产业需要,2013—2014年引种福建省农业科学院作物研究所选育的6个花生品种(系),结合马拉维4个品种,采用小区随机区组设计和大面积种植,在马拉维共和国进行品种比较和栽培技术示范。结果表明,雨季,7个参试品种品比结果,荚果产量1150.05~2943.75 kg/hm2,其中,‘抗黄1号’产量最高,为2943.75 kg/hm2,cg-7(CK)产量最低,为1150.05 kg/hm2,引种的6个品种比cg-7(CK)增产54.78%~155.98%。籽仁产量654.45~1845.6 kg/hm2,其中,‘抗黄1号’产量最高,为1845.6 kg/hm2,cg-7(CK)最低,为654.45 kg/hm2,引种的6个品种比cg-7(CK)增产55.67%~182.0%。干季,7个参试品种荚果产量2344.5~3559.5 kg/hm2,其中,‘福花0621’产量最高,为3559.5 kg/hm2,cg-7(CK)最低,为2344.5 kg/hm2,引种的6个品种比cg-7(CK)增产7.81%~51.82%,籽仁产量1428.0~2335.05 kg/hm2,其中,‘福花0621’产量最高,为2335.05 kg/hm2,‘福花9号’最低,为1428.0 kg/hm2,除‘福花9号’籽仁比cg-7(CK)减产6.44%外,其他5个品种比cg-7(CK)增产29.85%~52.99%。干季,栽培技术示范结果,马拉维的4个品种荚果产量1900.5~ 3213.0 kg/hm2,其中,BaKa产量最高,为3213.0 kg/hm2,Chalimbana产量最低,为1900.5 kg/hm2,籽仁产量1016.7~2307.0 kg/hm2,其中,BaKa产量最高,为2307.0 kg/hm2, Chalimbana产量最低,为1016.7 kg/hm2。试验结果表明,引种的6个花生品种生活习性等方面均适应于马拉维的生态条件和粗放的栽培习惯。福建省农业科学院作物研究所的花生栽培技术也适合马拉维4个花生品种,并取得高产。初步探明,利用马拉维湖等湖岸周遍特殊的生态环境,只要花期空气湿度≥50%,满足花生开花受精的生理需求,采用人工灌溉措施,可以在干季发展花生生产,建议扩大试验,示范后推广。  相似文献   

10.
Two semi-leafless pea cultivars and two highly lodging-resistant faba bean cultivars were grown in a series of replacement trials conducted on a highly fertile loam soil near Gottingen from 1992 to 1995. Cultivation as well as harvesting of mixed crops of both species proved possible. In spite of the delayed harvest of the mixed crop stands determined by the later pod ripening of the faba beans (varying between seasons from -f 5 to +21 days), noticeable seed losses due to pod shattering were not observed for the overripe peas. Standing ability of the peas was considerably improved by mixed cropping. Lodging began later and was less severe at harvest. Within mixtures with 50 % or more faba bean proportions at sowing (relative to the seeding rate of the pure stands) the peas, n i most cases, remained nearly upright until harvest and instead of the usual 'Plattlager', i.e., prostrate but upright top, frequently a more highly inserted 'Hohllager', i.e., upright but collapsed at higher nodes, was observed. In contrast to these remarkably synergistic effects for standing ability, such effects proved to be only small and nonsignificant for grain yield (−1.5–2.9%). Yield stability of the mixed crops was higher than that of the pure stands of both species. Estimates of the stability parameters, ecovalence, deviation from regression and environmental variance were at least halved. Yield proportions of peas and faba beans in the harvested seed of the mixtures did not correspond with the seed proportions at sowing. They differed considerably between seasons and cultivar combination. Higher yield proportions of faba beans were observed under wet and cold weather conditions and for the cultivar combination Victor/Disco, whereas higher yield proportions of peas were found under dry and warm weather conditions and for the cultivar combination Mythos/Baroness .  相似文献   

11.
旨在了解河南省育种现状和筛选适宜推广的花生品种。利用灰色系统理论对27个参试花生品种的11个主要性状:主茎高、侧枝长、总分枝、结果枝、单株结果数、百果重、百仁重、出仁率、饱果率、单株生产力、荚果产量进行关联度分析。结果表明:灰色关联度分析能准确判断参试品种优劣,筛选出适宜推广的参试品种;加权关联度值更为真实反映品种的综合表现,19个参试品种的加权关联度值比对照‘豫花15号’大,占参试品种的70%以上,其中‘商花17号’加权关联度值和产量排名第一,表现最好。河南省麦套花生整体育种水平较高,‘商花17号’、‘洛花3016’、‘濮花43号’、‘远杂14号’综合性状和产量表现优良,最适宜本省推广种植。  相似文献   

12.
The selection of cultivars for the predominant cropping systems of small farms in the tropics depends to a large extent on the information obtained by testing their performance across the different systems. The main objective of this experiment was to measure the genotype × cropping system (G × CS) interaction for yield and selected agronomic traits of climbing beans (Phaseolus vulgaris L.) grown as sole crop and intercropped with two morphologically contrasting maize (Zea mays L.) cultivars. A secondary objective was to identify the most efficient and productive bean–maize intercrop combinations. Seven climbing bean genotypes were grown as sole crop and intercropped with two maize varieties, BH 140 (Mix. 1) and Guto (Mix. 2), in a factorial arranged Randomized Complete Block Design with three replications at Bako Agricultural Research Center in western Ethiopia. Main effects due to genotype and cropping system (except days to flowering) were significant for all bean traits considered. The genotypes × cropping system interaction terms were also significant for the number of seeds per pod, 100-seed weight, harvest index and seed yield. While bean seed yield significantly correlated with the number of seeds per pod (in Mix. 1) and with harvest index (in both mixtures), positive and significant correlations occurred with the number of pods per plant and 100-seed weight under sole cropping system. The correlation between bean seed yields of Mix. 1 and Mix. 2 and between Mix. 2 and sole crop were positive and significant. No such relationship was found between Mix. 1 and sole crop. The results suggest that selection of suitable climbing bean cultivars for intercropping with maize varieties predominantly grown in the area should be made under the associated culture of the two crops. Intercropping contributed to a significant reduction in seed yield of the bean genotypes due mainly to its adverse effects on the numbers of pods per plant and seeds per pod. The index tLER1 identified most bean–maize genotype combinations of Mix. 2 as biologically more efficient system than Mix. 1. On the other hand, tLER2 values of more than 1.00 for all treatments of Mix. 2 demonstrated higher overall productivity of the intercrop system when the bean genotypes were grown in association with a late-maturing and high yielding maize hybrid BH 140.  相似文献   

13.
In a two-factorial trial, conducted in 1986 at the CIAT farm in Palmira (Colombia), the performance of nine tropical bean lines differing in resistance to rust and seven mixtures obtained by combining these lines on the basis of equal proportions in seed number was evaluated in a rust inoculated treatment and in a fungicide treated control.
Compared to the fungicide treated control, rust attack significantly reduced the yield of all susceptible lines by 24 to 56% in pure stands. In rust inoculated mixtures containing resistant, intermediate and susceptible genotypes, mixture effects on yield increased only by 3.3% compared to the fungicide treated control. In mixtures of common bean a higher proportion of resistant lines appears to be required compared to cereals for comparable reductions in the spread of rust due to lower plant density and correspondingly higher autodeposition rate of uredospores.  相似文献   

14.
The present study was conducted toinvestigate the genetic inheritance of podcomponents in spring-sown white lupin. Ananalysis of the genetic parameters ofproportion of pod walls and related podcomponents should be helpful to define aselection strategy in the future lupinbreeding programs. Two mating designs wereused, a complete diallel, and a halfdiallel, without reciprocals and withoutselfing. The parental lines covered therange of genetic variation for theproportion of the pod walls available inthe white lupin collection from INRA,France. Diallel analyses were carried outvia Griffing (model I and II) andHayman methods. Proportion of pod walls,seed weight per pod and mean seed weightshowed a mainly additive inheritance.Narrow sense heritability was higher forthe proportion of pod walls than for theother pod components. The correlationbetween general combining ability (GCA) andparental phenotypic values was high forproportion of pod walls. This suggestedthat mean parental performance could be auseful indicator of mean cross performancefor the proportion of pod walls in whitelupin. For pure line breeding, theestimates of GCA values showed thatEgyptian accessions would be valuableparents. Breeding for reduced proportion ofpod walls may be a way of improving seedyield.  相似文献   

15.
为明确不同花生品种(系)对钙肥响应的差异及机制,在酸化土壤上,以不施钙为对照,研究钙肥(CaO 450kg/hm2)对6个花生品种(系)钙素积累、分配、利用及产量的影响。结果表明,施钙肥可促进花生针壳和籽仁对钙素的吸收,籽仁尤为明显,而对营养器官(根、茎和叶)的影响较小。山花8号对钙肥较敏感,各器官钙含量及积累量较对照均显著增加,而花育32各器官增幅较小或没有增加,对钙肥反应较为迟钝;钙肥可促进籽仁发育,6个品种(系)籽仁干重平均值显著高于对照,但对营养器官和针壳干重影响较小,因此提高了收获指数。施钙可提高荚果产量,其中山花8号荚果产量增幅最大,为49.09%,花育32增幅最小,仅为4.11%;荚果产量与针壳和籽仁钙积累量呈极显著正相关,与营养器官钙含量呈显著负相关。综上,不同花生品种(系)对钙肥的响应差异较大,生产上应根据不同花生品种(系)对钙肥的敏感程度适量施用钙肥。  相似文献   

16.
Breeding programmes in common bean (Phaseolus vulgaris L.) have mainly focused on performance under monoculture conditions. Interactions among cultivars and cropping systems do occur and genotypes bred for pure cropping may not be suitable for intercropping. This study was undertaken to obtain estimates of genetic parameters of quality traits for bush bean landraces grown in two cropping systems, and the interrelationships of these traits between pure cropping and intercropping with maize (Zea mays L.). Field experiments were conducted at two locations for two years. Expression of most traits was not strongly influenced by genotype × environment interactions. Heritability estimates were similar in both cropping systems for most pod and seed quality traits. Positive correlations were observed between pure cropping and intercropping for pod characters (weight, length, width and texture) and seed characters (dry and imbided weight, length, hardness, coat proportion, water absorption and crude protein). Use of a selection index is suggested for breeding for seed size, water absorption,coat proportion and crude protein for both cropping systems. However, larger gains would be expected in pure cropping for most traits. Bean accessions PHA-0267, PHA-0285, PHA-0286 and PHA-0299 should be used for developing acceptable culinary and high protein breeding lines for either cropping system. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

17.
N. A. Fotiadis 《Euphytica》1988,37(2):167-171
Summary Eighteen alfalfa polycross progenies were tested for forage and seed yield in pure stand as well as in competition with the mixture of all progenies included in the test. The type of border affected significantly the forage and seed yield of individual progenies in one third of the cases. In most of these cases competition from the mixture resulted in reduction of the yield of individual progenies. There was no correlation between pure stand forage and seed yield, but there was significant positive correlation between forage and seed yield determined under conditions of competition. It is concluded that polycross progenies should be tested in plots bordered by the mixture of all progenies being tested.  相似文献   

18.
178 common vetch (Vicia sativa L.) strains were tested for 2 years under dryland conditions in Bursa, Turkey. Broad-sense heritability of the traits was calculated for each trait. Phenotypic and genotypic correlation coefficients between seed and straw yield, with several morphological and reproductive traits, were obtained. Broad-sense heritability estimates were high for 1000-seed weight and number of seeds per pod. Heritability values for both seed and straw yield were small and insignificant. Harvest index, 1000-seed weight and spring vigour showed significant positive correlations with seed yield, but days to flower correlated negatively with seed yield. Spring vigour, plant height and number of leaflets per leaf correlated positively, while harvest index, seeds per pod and seeds per plant correlated negatively with straw yield. Correlations between seed and straw yield were both positive and significant.  相似文献   

19.
Summary Plants from four species of barley, H. agriocrithon, H. spontaneum, H. distichum, H. intermedium, and their F1 hybrids were grown together in a mechanical diallel and competitive effects were investigated by the application of the diallel analysis technique of Durrant (1965).There was no evidence of hybrid vigour when the hybrids were grown as pure stands but in binary mixtures the hybrids, considered overall, were more vigorous than their parents. Although this relationship was not complete the hybrids grown with the parents formed the most productive class, exceeding by 24% the combined mean grain yield of the parents grown alone and in parental mixtures.In the eight characters investigated there was a tendency for compensation to occur between the mixture components but this was far from complete (i.e. an increase in one component was not precisely balanced by a decrease in the other). Those genotypes with large pure stand values tended to become smaller and, in compensation, the smaller genotypes larger. Since, however, the compensation was not complete the mixture means tended to be lower than the mean of the components in pure stand. The converse was found to be true for yield of grain.The principal response to competition is for each genotype to be either uniformly suppressed or enhanced in the presence of an associated genotype, the strength and direction of this response being given by the value calculated for each genotype. The values were negatively correlated with their pure stand values (e.g. plants with a high dry weight when grown alone were depressed more than plants with a low dry weight when grown alone, and vice-versa). There was, however, no correlation between the pure stand value and the value in respect of yield and 100-seed weight.Although both H. agriocrithon and H. spontaneum were found to be poor competitors, only those hybrids derived from crosses with H. spontaneum have this poor competitive ability transmitted: hybrids involving H. agriocrithon are intermediate in competitive ability between their parents. Again, the hybrid formed between the two advanced barleys H. distichum and H. intermedium produces a hybrid of lower competitive ability than either parent.The poorer competitors tend to produce fewer tillers and, as a consequence have a lowered seed output per plant when associated with other genotypes in mixtures. Grown in pure stand the weak competitors tend to be multi-tillering and to have a high output of seeds.The plastic responses of other characters associated with yield, together with those such as ear emergence and height are also discussed. One hybrid, (s×d), a cross between H. spontaneum and H. distichum is of particular interest in that although a poor competitor it is nevertheless very high yielding when grown in pure stand. Furthermore, its suppression in mixtures is not sufficiently great as to reduce its overall ranking compared with its associates when aggregate yield is considered. Analytical techniques such as those described here could be of use to the plant breeder in his search for high yielding, compatible genotypes, of low competitive ability. The technique may also be used to test breeding procedures.  相似文献   

20.
甘蓝型油菜裂角相关性状的遗传与相关分析   总被引:4,自引:2,他引:2  
崔嘉成  刘佳  梅德圣  李云昌  付丽  彭鹏飞  王军  胡琼 《作物学报》2013,39(10):1791-1798
抗裂角性是非常重要的油菜性状, 但相关研究报道较少。本研究对11个甘蓝型油菜骨干亲本品系及由其配制的30个不完全双列杂交组合在2个环境下的抗裂角指数及其他7个角果相关性状进行了遗传分析。结果表明, 抗裂角指数遗传变异显著, 遗传上受少数主效基因控制, 效应以加性为主, 显性效应和环境效应影响较小。大部分杂交组合的抗裂角指数杂种优势不显著。抗裂角指数与角果长、果皮重、千粒重和种子直径呈极显著正相关, 与结角密度和角粒数呈极显著负相关。抗裂角性相关性状中, 角果长、千粒重、结角密度和种子直径变异主要由加性方差解释;果皮重和每角粒数主要由显性方差解释。亲本评价分析指出, 作为波里马细胞质雄性不育系统保持系的ZS11B和恢复系的R11其抗裂角性的一般配合力高, 是培育抗裂角杂交油菜品种的首选直接亲本。  相似文献   

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