Study of Parental Polymorphism and Allelic Variation for Grain Quality and Yield Traits in Rice (Oryza sativa L.) Using SSR Markers

Aim: Identification of polymorphic markers is prerequisite for conducting any QTL mapping experiment because if the parents are polymorphic for the traits of interest, then further selection of plants in the progenies becomes easy. Hence, the objective of the present study was to identify polymorphic markers for grain quality and yield traits among the parental lines Improved Samba Mahsuri and Badshabhog. Place and Duration of Study: It was carried out at Molecular Breeding Lab, Department of Genetics and Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi - 221 005, India, during 2019. Methodology: Two parents Improved Samba Mahsuri and Badshabhog were used for the present study. The DNA extraction was done as per the CTAB method suggested by Murray and Thompson. Standard PCR protocol was followed. Results: For parental polymorphism survey, a total of 576 randomly selected SSR markers including 26 gene specific markers related to aroma, cooking and eating quality, grain dimension and yield related traits distributed across the 12 chromosomes of rice were used. Overall, 96 markers including 4 gene specific markers were found to be polymorphic between the two genotypes indicating a total polymorphism percentage of 16.67%. The highest polymorphism percentage was recorded on chromosome 6 (26.67%) followed by chromosome 4 (21.43%) and the lowest polymorphism percentage was observed on chromosome 10 (8.93%). The gene specific markers nksbad2, ARO7, BADEX7_5 and SSI were found to be polymorphic. Conclusion: Based on the present study it may be concluded that the polymorphic markers identified will further be utilized in genotyping of F2:3 population, linkage analysis and mapping QTL’s for grain quality and yield traits.