GENERAL COMBINING ABILITY FOR FIELD RESISTANCE TO LATE BLIGHT IN POTATO

Abstract

Estimates ofgeneral combiningability of19 potato parents were computed by the weighted least square analysis using data from greenhouse testing of field resistance to late blight in 32,552 seedlings from 28 crosses. SLBIP-9-12, KufriJyoti and SLBIR-ll-10 were found to be the best parents for transmitting late blight resistance. Very high correlation less than f26. 0.83") between the observed and fitted percentage of resistant seedlings in different aosses indicated that useful information can be obtained through this model about the promising parents for late blight resistance from the data which are otherwise rejected. However, significant ,l value indicated that specific combining ability between parents also contributed to the observed variation.