Evaluation of Pyramided Rice Genotypes Derived from Cross Between CSR-30 and IRBB-60 Basmati Variety against Bacterial Leaf Blight

Evaluation of Pyramided Rice Genotypes Derived from Cross Between CSR-30 and IRBB- 60 Basmati Variety against Bacterial Leaf Blight

Bacterial leaf blight (BB) disease caused by Xanthomonas oryzae pv. oryzae is one of the most severe diseases effecting Basmati rice production in India. CSR-30 is widely grown in Haryana and is extremely popular amongst rice farmers and consumers because of its salt tolerance, aroma, high yield, medium slender grains and excellent cooking and eating qualities. CSR-30 lacks tolerance to BB. The present investigation was therefore planned to introgress BB resistance genes (xa5, xa13 & Xa21) from IRBB-60 to CSR-30. The pyramided BC3 F1 genotypes were evaluated for BB incidence under artificial field inoculation. Scoring of inoculated plant was done 14 days after inoculation. The triple and double resistance genes pyramided genotypes provided enhanced resistance as expressed by smaller mean lesion length in comparison to genotypes with individual genes.