排序方式: 共有10条查询结果,搜索用时 296 毫秒
1
1.
The characterization Bulgarian natural growing areas of Leucojum aestivum L. was on the basis of the chemical composition of the plants and some soil characteristics which give an opportunity to choose those conditions suitable for growing and obtaining enlargement of the source of plant material with high galanthamine content. This information should benefit the improvement of natural growing areas for Leucojum aestivum L. as well as for the creation of new industrial plantations. 相似文献
2.
3.
Krasimir Rusanov Natasha KovachevaMila Rusanova Ivan Atanassov 《Industrial Crops and Products》2012,37(1):6-10
The composition of volatile compounds in the rose essential oils obtained from the rose flowers has been known to be affected by a number of factors including the region of rose growing. The variations of the flower volatile composition of Rosa damascena plants growing in 11 different rose plantations along the famous Rose Valley in Bulgaria were studied following GC/MS metabolite profiling. ANOVA statistical test revealed that only 14 of a total of 90 identified compounds were significantly influenced by the geographic location of the sampled rose plantation. The hierarchical clustering analysis based on the subset of these 14 compounds revealed no clear correlation between the levels of rose flower volatiles and geographic location of the studied rose plantations. The results from the study suggest low variability of rose flower volatiles accumulation and elevated plasticity of the common R. damascena genotype industrially cultivated in the Rose Valley. 相似文献
4.
Somaclones (R3 and R4 generations) regenerated from five winter wheat (Triticum aestivum L.) genotypes were evaluated for variation in agronomic
and morphological characters. Immature embryos were used as initial explant material. Comparisons for plant height, top internode
length, spike length, number of seeds per spike and 100 seed weight were made between the somaclones and their parents. Some
morphological variations of stem and spike characteristics were registered which demonstrate that plant height and spike length
can be changed by using immature embryo culture. The results obtained may be considered a biotechnological contribution to
wheat plant improvement.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
5.
Kamen L. Stefanov Dimitar L. Djilianov Zarka Y. Vassileva Rositsa B. Batchvarova Atanas I. Atanassov Liliana V. Kuleva Simeon S. Popov 《Pest management science》1996,46(4):369-374
After a one-step selection procedure with glyphosate added to the callus medium, tobacco regenerants were obtained from calluses surviving on field doses of the herbicide. The lipid and sterol compositions of potted plants from the two original cultivars which underwent the selection procedure but without glyphosate, and the selected regenerants were investigated. Controls were derived from micropropagation and not from seeds. They served as appropriate controls for comparison with glyphosate regenerants, i.e. they underwent exactly the same experimental conditions except for the glyphosate treatment. Plant regeneration was strongly (at one-step selection) or fully (at stepwise selection) inhibited. Only a few glyphosate-tolerant plants (seven of Nevrokop A24 and five of Zlatna arda) were obtained which were cloned and potted. At least 10 plants of one clone per genotype were used for the further biochemical analyses. The spraying of the tobacco plants from the cultivars with glyphosate led to a decrease of monogalactosyl diacylglycerol content and increase of the saturated fatty acids in all glycolipid classes. The concentration of stigmasterol increased and that of sitosterol decreased only in Zl.arda variety. In the regenerants there were different changes in lipid composition, concerning mainly a decrease of monogalactosyl diacylglycerols (MGDG) and an increase of digalactosyl diacylglycerols (DGDG) in Zl.arda-derived regenerants and increase of the amounts of neutral lipids and decrease of phospholipids (PL) in the Nevrokop A24-derived regenerants. Surprisingly, after treatment of the regenerants with glyphosate, the MGDG amounts in these regenerants were higher than in the controls, which could mean a lesser ability to control ion permeability. 相似文献
6.
E. todorovska A. trikonova M. petrova Z. vitanova E. marinova M. gramatikova D. valcheva S. zaprianov N. mersinkov A. Atanassov 《Plant Breeding》1997,116(6):511-517
In order to assess the genetic variability among regenerants. field trials were conducted with 64 barley lines derived from tissue culture (TCD lines) of four Bulgarian barley varieties. The results indicate that the agronomic performance was altered by tissue culture regeneration and the frequency of variation was cultivar dependent. Seven TCD lines showing desirable agronomic characters were selected in the SC16 progeny. Molecular markers (protein, restriction fragment length polymorphism (RFLP) and random amplified polymorphic DNA (RAPD) have used applied to determine the variability induced by tissue culture. Polymorphism was detected in sequences coding for C-hordeins in line 70 derived from cv.‘Jubiley’Two lines from cv.‘Ruen’exhibited polymorphic bands after hybridization with a mitochondrial DNA probe. RAPD assays have been carried out using 20 different l0-mer primers. Heritable polymorphisms in several TCD lines have been observed. 相似文献
7.
N. I. Gorinova A. I. Atanassov D. V. Stojanov J. Tencheva 《Journal of plant nutrition》2013,36(9):1631-1636
The elemental composition of seven soils of the main geographical regions in Bulgaria for the growth of Leucojum aestivum L. was determined. It was found that a relationship exists between the galanthamine content of the plant and the chemical composition of the soil. These results indicate that galanthamine bio‐ synthesis could be controlled by the soil fertility level. 相似文献
8.
Background
The progress and completion of various plant genome sequencing projects has paved the way for diverse functional genomic studies that involve cloning, modification and subsequent expression of target genes. This requires flexible and efficient procedures for generating binary vectors containing: gene fusions, variants from site-directed mutagenesis, addition of protein tags together with domain swaps and deletions. Furthermore, efficient cloning procedures, ideally high throughput, are essential for pyramiding of multiple gene constructs. 相似文献9.
Genetic variation among five elite winter barley cultivars (H. vulgare L.) currently grown in Bulgaria was assessed at the molecular level using restriction fragment length polymorphism (RFLP)
and randomly amplified polymorphic DNA (RAPD) markers. The present study sampled RFLPs in four well characterized multigene
families in barley: the seed storage protein loci; the 18S, 5.8S and 26S ribosomal DNA loci; the loci coding for 5S ribosomal
RNA and the loci coding subunit α of ATP-A complex in the mitochondrial genome. RFLPs were detected in three out of five investigated
chromosomal loci in the barley cultivars studied. RAPD assay using arbitrary 10-base primers was applied to generate amplified
length polymorphic markers in barley. Overall a total of 15 polymorphic phenotypes were found among the studied barley cultivars
by using 11 out of 25 tested primers. All RAPDs were considered as dominant genetic markers except for two, where PCR and
Southern blot
analysis indicated the presence of codominant amplification products. Five RAPD polymorphisms in F1 and F2 progenies of the cross between Alpha and Obzor were inherited in Mendelian fashion. The determined values for the genetic
variation proved a high genetic similarity among the tested cultivars. Genetic similarity (GS) calculated from RFLP and RAPD data ranged from 0.888 to 0.997 with a mean GS – 0.933.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
Textile fibers were obtained from secondary polyethylene terephtalate (PET) and its mixtures with primary PET at initial orientation of 18000–33000 %, rate of additional orientation drawing 3.5–6.5 times and temperature of thermal fixation 363–413 K. The fibers’ tensile strength was found to decrease and elongation at break to increase with the decrease of their linear density under the conditions of fibers formation. For the fibers based on polymer mixtures, the presence of oxidized fragments in the secondary PET limited the compatibility of the two polymers which resulted in deteriorated tensile properties. The linear density (4–16 dtex), tensile strength (30–50 cN/tex) and elongation at break (20–60 %) of the PET fibers obtained were close to these for the industrially produced polymer fibers. The values of the average diameter of the fibers formed and oriented under laboratory conditions allows classifying them between the fine and the coarse textile fibers which makes them suitable for the textile industry. 相似文献
1