Cytological and Molecular Characterization for Local and Exotic accessions of Lathyrus spp
Walaa Taher Hassan El-Salamony;
Abstract
The genetic variability based on karyotype formula was studied for
40 accessions of genus Lathyms. All accessions have 2n= I 4 c.hromosome. Karyotype formulas have a great uniformity among
accessions of each species, suggesting an interaspecific stability in Lathyrus species. Our data allowed the differentiation of several accessions among sections Lathyrus, Linearicarpus and Clymenum in number of m chromosome. The variation among section Lathyms support that section Lathyrus are not fully constant as has been postulated. Sateliites were detected in a pair of chromosome in L. sativus (TUN and AFG). On the other hand B-chromosome was detected in L. sativus (USSR, BAN, CAN, and PAK) L. gorgoni (JOR) and L. annus (SYR). This finding may be due to the variation in DNA amount by increase in the non-repetitive sequence. The variation in size of chromosomes of the members of Lathyms ts associated with evolution in the genus.
The genetic variations of 56 accessions of Lathyrus 5pp were studied using I 00-seeds weight and protein content. The variations in seeds weight between or within species of Lathyrus spp were very pronounced ral1ged from 57.5 to 315 mg/g. This variation is due to the evolution response of plants to (a) maximize the potential fitness by producing a large number of seeds and (b) increase the chances of establishment of the resulting seedlings through a great allocation of maternal resources to individual seeds. The mean number of seed weight of L. sativus was the biggest and the lowest was L. phaericus. The highest seed weight of L. sativus might be attributed to a dry habitat or the variations in height, growth form and dispersal mode of plants within different communities. In this study the seeds that had big weights had flower with a white or white and blue colors with white seeds. This relationship needs further investigation. It can exploited as a morphological marker in breeding programs for an economic agronomic trait. The variation in seed protein was large ranking from 493.63 to 22.6.44 mg/g, with coefficient of variations ral1king (i•om 0.0 to 0.084. Our data showed that there was no relationship between the protein content and weight of 1 00-seeds of Lathyn1s spp. This result indicat that selection for desirable protein content would also allow the selection of genotypes with high biomass, low seed yield and low seed weight
40 accessions of genus Lathyms. All accessions have 2n= I 4 c.hromosome. Karyotype formulas have a great uniformity among
accessions of each species, suggesting an interaspecific stability in Lathyrus species. Our data allowed the differentiation of several accessions among sections Lathyrus, Linearicarpus and Clymenum in number of m chromosome. The variation among section Lathyms support that section Lathyrus are not fully constant as has been postulated. Sateliites were detected in a pair of chromosome in L. sativus (TUN and AFG). On the other hand B-chromosome was detected in L. sativus (USSR, BAN, CAN, and PAK) L. gorgoni (JOR) and L. annus (SYR). This finding may be due to the variation in DNA amount by increase in the non-repetitive sequence. The variation in size of chromosomes of the members of Lathyms ts associated with evolution in the genus.
The genetic variations of 56 accessions of Lathyrus 5pp were studied using I 00-seeds weight and protein content. The variations in seeds weight between or within species of Lathyrus spp were very pronounced ral1ged from 57.5 to 315 mg/g. This variation is due to the evolution response of plants to (a) maximize the potential fitness by producing a large number of seeds and (b) increase the chances of establishment of the resulting seedlings through a great allocation of maternal resources to individual seeds. The mean number of seed weight of L. sativus was the biggest and the lowest was L. phaericus. The highest seed weight of L. sativus might be attributed to a dry habitat or the variations in height, growth form and dispersal mode of plants within different communities. In this study the seeds that had big weights had flower with a white or white and blue colors with white seeds. This relationship needs further investigation. It can exploited as a morphological marker in breeding programs for an economic agronomic trait. The variation in seed protein was large ranking from 493.63 to 22.6.44 mg/g, with coefficient of variations ral1king (i•om 0.0 to 0.084. Our data showed that there was no relationship between the protein content and weight of 1 00-seeds of Lathyn1s spp. This result indicat that selection for desirable protein content would also allow the selection of genotypes with high biomass, low seed yield and low seed weight
Other data
| Title | Cytological and Molecular Characterization for Local and Exotic accessions of Lathyrus spp | Other Titles | توصيف خلوى وجزيئي لمدخلات وراثية محلية وخارجية من بسلة الزهور | Authors | Walaa Taher Hassan El-Salamony | Issue Date | 2007 |
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