EVALUATION OF GENETIC PURITY OF F1 HYBRID SEEDS IN RICE USING SSR MARKERSDANAM SHASHIBHUSHAN, ASHISH REDDY MUCHANTHULA AND T. PRADEEP
Evaluation of the genetic purity of a hybrid seed lot is essential due to the fact that the pure seed lot aids in attaining the maximum crop yield. Studies had already showed that 1% genetic impurity of rice can lead to a loss of 100 Kg grain yield per hectare. Therefore, it is necessary to maintain the genetic purity of a hybrid seed. Grow out test (GOT) and molecular marker test are two prominent purity testing methods followed across the world for the evaluation of the genetic purity of a seed lot. In the current study, a molecular test was conducted and compared with the grow out test to assess the genetic purity of the rice hybrid, CO4. The SSR marker, RM570 was amplified on the DNA extracted from the rice hybrid, CO4, and its parents, CMS 23A and CB 174R. The amplification of marker was conducted on the DNA of 20 hybrid leaves and 1 leaf from each parent, separately. The marker was amplified at 600 bp in the parent, CMS 23A, and 610 bp in CB 174R, and amplified at both the base pairs in their F1 progeny, CO4. This confirms the hybridity of the rice hybrid, CO4. The marker was unveiled in all the 20 leaves of the hybrid rice sample ensuring the purity of the seed lot. The grow out test results also showed 100% purity without any deviations. It concludes that molecular marker, RM570 is effective in hybrid confirmation purity evaluation of the rice hybrid, CO4.