PJB-2025-91
GENETIC DIVERSITY IN Lathyrus spp. BASED ON QUALITATIVE AND QUANITATIVE CHARACTERS OF KARYOTYPES
Reda Helmy Sammour
Abstract
This work aimed to evaluate the genetic diversity in accessions of Lathyrus L. collected from world-wide areas, using karyomorphological features, karyotype structure, and asymmetry to provide the opportunity for breeders to develop new cultivars with desirable characteristics.The results showed that Lathyrus accessions had chromosome numbers 2n=14 and predominant chromosome types—metacentric and submetcentric chromosomes. However, subtelocentric chromosomes, B-chromosomes, and satellites were observed in some accessions, reflecting considerable variation in karyotype formulas. B-chromosomes had a significant correlation with the weight of 100 seeds, whereas satellite chromosomes were found mainly in the karyotype asymmetry degree 2B, which is considered relatively advanced and represented 67.7% of the investigated accessions. Other karyotype asymmetry degrees, 2A (which was considered a primitive feature) and 2C (which was considered highly advanced), represented 22.7% and 9.7%, respectively. Karyotype asymmetry measures were greatly varied between Lathyrus accessions. Pearson correlation coefficients of asymmetry measures showed a positive correlation between: (1) the indices of intra-chromosomal measures [the coefficient of variation of chromosome length (CVCL) and the interchromosomal asymmetry index (A2)]; and (2) the indices of intrachromosomal measures [coefficient of variation of centromeric index (CVCI), mean centromeric asymmetry (MCA), intrachromosomal asymmetry index (A1)]. Multivariate analysis of the mean values of karyotype asymmetry measures showed that section Clymenum was closely related to section Linearicarpus and indicated that section Lathyrus was far apart from other sections. In conclusion, there was a wide variation in qualitative and quantitative features of the karytpes of the Lathyrus L species, which is recommended for developing desirable cultivars.
To Cite this article:
Under Review
We Welcome Latest Research Articles In Field Of Botany The Pakistan Journal of Botany is an international journal .... Read More
