Abstract:
These studies were conducted in the Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad during 1999-2002. Variability for various plant physiological traits of four canola varieties and their cross combinations was ascertained under normal and drought conditions. Analysis of variance revealed significant differences for almost all the traits under both conditions. There was higher variability in physiological traits like carotenoids, conductance and chlorophyll a:b. Range and Shiralee showed tolerance behaviour through various physiological traits. Similarly among generations, Range x Shiralee (F1) had higher total chlorophyll contents under drought. Maximum genotypic variability under normal conditions was found in conductance with phenotypic variance and having higher broad sense heritability with higher genetic advance. Chlorophyll a (ch-a) showed 46.18 percent genotypic coefficient of variation, 88.66 percent phenotypic coefficient of variation and 0.52 value of broad sense heritability. Under drought conditions, maximum genotypic coefficient of variation with phenotypic coefficient of variation was found in carotenoids. Carotenoids had higher heritability and genetic advance. So to improve drought tolerance there is need of simple selection of plants having high carotenoids under drought conditions. The traits having high heritability with high to moderate genetic advance suggest the role of additive gene action in controlling the traits. Such traits could be improved through simple selection.
Page(s):
299-315
DOI:
DOI not available
Published:
Journal: Journal of Agricultural Research, Volume: 43, Issue: 4, Year: 2005