Deciphering field resistance to powdery mildew and yellow rust among popular cultivars of wheat and set of differential lines

Abstract

The analysis of data on disease severity using genotype (G) and genotype by environment interaction (GGE) biplot revealed that the highest contribution to disease severity was due to genotype (G) 50.75 and 47.56 followed by G X E interaction 44.38; 37.70 and environment (E) 4.8 and 14.74 for powdery mildew (PM) and yellow rust (YR), respectively. Sixteen genotypes showing mean TDS ≤15% and Area under Disease Progress Curve (AUDPC), relative Area Under Disease Progress Curve (rAUDPC) and ‘r’ ranging between 20.63-494.44, 2.75-40.05 and 0.01-0.04, respectively in comparison with TDS, AUDPC, rAUDPC and ‘r’ of 41%, 1510.88, 99.18 and 0.04 respectively, in susceptible cultivar Lehmi, were slow mildewing genotypes. Six genotypes Maris dove, Rye, Aldan, CMH 77.308, SAW 71 and SAW 74 showed multiple resistances to PM and YR, of which ALDAN and CMH 77.308 were reported to be resistant to Karnal bunt (KB) also. Hence, these can be used as potential donors aimed to develop cultivars with combined resistance to PM, YR and /or KB and Kukumseri could be used as an ideal hot spot for screening against PM and YR.