Variability of grain filling parameters in wheat genotypes of different earliness

Abstract

Final grain dry weight (W) is dependent on the two parameters: rate (R) and duration (T) of grain filling. The study was undertaken to compare W with R and T in four groups of genotypes which are different in earliness, and control group of high – yielding NS cultivars. A logistic equation was used for estimation W, R and T. Stepwise multivariate analysis showed differences between groups for all three estimated parameters. Groups with the highest grain dry weights had high maximum rates and short durations of grain filling in common environment. In unfavorable environment long grain filling duration had advantage.