Comparison of Blast, Bacterial Leaf Blight and Brown Plant Hopper Introgressed Lines for Yield and Morphological Traits Over Original Line

Abstract

Rice as a staple food for very large population suffers from various biotic and abiotic stresses. Among the biotic stresses, Blast, Bacterial leaf blight and Brown plant hopper (BPH) are considered to most potential threats that significantly affect the rice productivity. The use of chemical usage for controlling these diseases and pest attacks is not environmentally friendly and is expensive. Using Molecular Marker assisted backcross breeding program we have improved one of our hybrid parental line with 5 genes (xa13, Xa21, Pi54, Bph20 and Bph21). We have developed 15 near isogenic lines having similar agronomical characters as of recipient parent, they are promising for their direct induction in breeding program. Our results indicated that out of fifteen lines, Six lines i.e. GK 101-12, GK 101-15, GK 101-9, GK 101-5 and GK 101-2 out-performed in all the three locations tested, they had not only have very high level of resistance to BLB, Blast and BPH but also showed significantly higher yield compared to susceptible check as well as recipient parent. These lines may be used for improvement of our existing hybrid and also for developing of new hybrids with other CMS lines. These lines are also useful for developing new set of restorer lines through (R x R) and also useful for introgression of wide spectrum of resistance to the varieties/hybrid.

Keywords

• bacterial leaf blight
• blast
• brown plant hopper
• introgression
• inoculation
• molecular assisted backcross breeding