My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in AJ

  1. Vol. 81 No. 4, p. 662-664
     
    Received: July 26, 1988
    Published: July, 1989


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1989.00021962008100040020x

Genotype × Environment Interaction in Maize

  1. M. S. Kang  and
  2. D. P. Gorman
  1. Dep. of Agronomy, Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Ctr., Baton Rouge, LA 70803-2110.

Abstract

Abstract

Genotype × environment (GE) interactions are a challenge to plant breeders because they cause difficulties in selecting genotypes evaluated in diverse environments. When GE interaction is significant, its cause, nature, and implications must be carefully considered. No information is available on the contribution of weather variables and environmental index (YȲ.j or mean yield of all cultivars in jth location minus YȲ.. or overall mean yield for all cultivars and all locations) to GE interaction for yield in maize (Zea mays L.). The objective of this study was to determine the effect of an environmental index, maximum and minimum temperatures, rainfall for the growing season, preseason rainfall, and relative humidity (covariates) on GE interaction for yield. Seventeen hybrids grown in 12 environments (4 locations × 3 yr) were studied. The GE interaction was significiant and was partitioned into s2i (stability variance) components assignable to each genotype (hybrid). Heterogeneity (non-additivity) due to each covariate was removed from the GE interaction, and the remainder of the GE interaction variance was partitioned into σ2i components assignable to each genotype. Environmental index accounted for 9.61% of the GE interaction sum of squares (P = 0.10). This was the largest amount of heterogeneity removed from the GE interaction by any single covariate. Rainfall during the growing season removed 1.4% of the GE interaction sum of squares and preseason rainfall removed 1.1% of the GE interaction sum of squares as heterogeneity. Minimum temperature, maximum temperature, and relative humidity removed a negligible amount of heterogeneity from the GE interaction. The 17 hybrids evaluated in this study were differentially affected more by differential fertility and/or cultural practices (environmental index) than by weather factors. Seven of the 17 hybrids had unstable performance across the 12 environments.

Approved for publication by the Director of the Louisiana Agric. Exp. Stn. as manuscript no. 88-09-2429.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .