SSR Marker Studies on Genetic Diversity for Zinc Content in DifferentGenotypes of Rice (Oryza sativa L.)

摘要

Genetic diversity underlies the improvement of crops by plant breeding. The present study was thus conceptualized and executed with the prime objective of assessing the genetic diversity of eighty three rice genotypes using nineteen SSR markers derived from the genomic regions associated with zinc metabolism. Three polymorphic markers generated 7 alleles in eighty three genotypes. The number of alleles for each marker ranged from 2 to 3 with an average value of 2.3. The amount of polymorphism exhibited by SC 116 was found to be high with the PIC value of 0.85, while the other two markers, SC 126 and SC 129, showed similar polymorphism by having the same PIC value of 0.73. Significant grouping of the rice genotypes based on the data generated by these three polymorphic markers was not possible, since the trait of zinc accumulation in grains is controlled by multiple genes and only three markers were used in the present investigation, which may not be able to reveal sufficient polymorphism. More markers, preferably functional molecular markers, would elicit the genetic diversity of the characterized germplasm.