Genotype x environment interaction effect and genotypic correlation for nutrient quality traits of indica rice (Oryza sativa)

Abstract

The genetic effects and genotype x environment interaction effect on nutrient quality traits of indica rice (Oryza
sativa L.) was studied during 1994-95 by using genetic models for quantitative traits of triploid endosperm. Nine
cytoplasmic male sterile lines as females and 5 restoring lines as males were included in a factorial design for 2 years.
Results indicated that the nutrient quality traits of protein content, protein index and lysine content were mainly
controlled by genetic effect but lysine index was mainly affected by genotype x environment (OE) interaction effects.
Maternal effects were the main genetic effects for protein content, lysine content and lysine index, hut not for protein
index. Cytoplasmic effects were significant for protein content and protein index only. Among the GE interaction effects,
protein content and lysine content traits were mainly affected by seed interaction effects and protein index and lysine
index by maternal interaction effects. Direct additive and maternal additive effects primarily controlled tbe performance
of the rice nutrient quality traits. Direct and maternal additive interaction effects were more important ror protein content
and protein index. The nutrient quality traits were controlled by direct and maternal dominance effects, and their
environment interaction effects especially for lysine content and lysine index. The cytoplasmic interaction effects were
significant for all nutrient quality traits studied. The genotypic correlations among nutrient quality traits could be further
partitioned into genetic correlations and GE interaction correlations. Significant correlations for the parirwise nutrient
quality traits, especially for direct additive correlations and cytoplasmic interaction correlations, Were noted.