Vol. 7, Issue 5 (2018)
Genotype × environment interactions for grain micronutrient contents in pearl millet [Pennisetum glaucum (L.) R. Br.]
Author(s): Pawar VY, Kute NS, Magar NM, Patil HT, Awari VR, Gavali RK, Deshmukh GP and Kanawade DG
Abstract: Assessment of the stability of grain iron (Fe) and zinc (Zn) content across growing regions is a pre-requisite in breeding for micronutrient enrichment in grains. Grain Fe and Zn contents were estimated in a set of 68 pearl millet genotypes grown at four environments. The Fe and Zn in grain ranged from 37.73-111.35 mg/kg and 26.48-111.35 mg/kg, respectively, across the environments. Significant genotype × environment (G × E) interactions were observed for both grain Fe and Zn, indicating differential nutrient accumulation by the genotypes. Additive main effects and multiplicative interaction (AMMI) analysis indicated that the first two principal components were significant and contributed more than 75% of G × E sum of squares. As the PCA I contributed more in G X E interaction, than other PCA, for both Fe and Zn, were pooled into residual, thus AMMI model with PCA I axis was accepted. Though environment (linear) variance was significant indicating linear sensitivity, significant pooled deviation for both the traits suggested that expression in some of the genotypes fluctuated significantly from their respective linear path of response to environments. None of parents or hybrids was found consistently stable for all the characters in any environment. The four promising cross combinations which had average stability for both micronutrient can be recommended for more rigorous testing in an array of environments to assess their stability or they may be used for generating new inbreds or varieties with wider adaptability for micronutrient, yield and yield contributing characters over location. The stable parents S-12/30088 could be used as sources for further genetic improvement of micronutrients. Environmental specific crosses may also be identified with high heterotic and sca effects, and available gene pool may be strengthened with the inclusion of more charge source of parental genotypes.
How to cite this article:
Pawar VY, Kute NS, Magar NM, Patil HT, Awari VR, Gavali RK, Deshmukh GP, Kanawade DG. Genotype × environment interactions for grain micronutrient contents in pearl millet [Pennisetum glaucum (L.) R. Br.]. J Pharmacogn Phytochem 2018;7(5):37-44.