Heterosis, combining ability, and genetic parameters in pea

Abstract

This research was carried out to study the inheritance of some traits of pea through using (line × tester) mating design, three inbred lines of peas used as (Lines), and other four inbred lines used as (Testers). These inbred lines crossed to produce 12 F1 crosses. During the autumn season of 2014, the parental inbred lines grown, then emasculation and crossing were done by hand and sufficient seeds for crosses were produced. During the growing season of 2015-2016, the F1 seeds of twelve crosses with their parents were implemented in the field experiment using CRBD with three replicates in Girdjan Research Station, to estimate heterosis, general and specific combining abilities effects for parents and hybrids respectively, and genetic parameters for traits: plant height (cm), the number of branches plant-1, the number of days to 50% flowering, the number of days to harvest, number of seeds pod-1, number of pods plant-1, and seed yield plant-1 (g). The results of the analysis showed that the mean square due to genotypes was highly significant for all traits. The tester parent, Giant sugar pod surpassed other parents for plant height, and number of branches plant-1. The hybrid NS minima × Provence gave maximum negative heterosis value for the number of days to harvest. The same hybrid NS minima × Provence had the highest positive heterosis values for two traits a number of pods plant-1, and seed yield plant-1.

Keywords

• line × tester analysis
• gca and sca
• heterosis
• degree of dominance
• heritability