Secondary traits explaining sorghum genotype by environment interactions for grain yield
Ana J. P. Carcedo A , Pedro A. Pardo B and Brenda L. Gambin A C
+ Author Affiliations
- Author Affiliations
A Instituto de Investigaciones en Ciencias Agrarias de Rosario (IICAR), Facultad de Ciencias Agrarias, Universidad Nacional de Rosario, Campo Experimental Villarino S/N, Zavalla (S2125ZAA), Prov. de Santa Fe, Argentina.
B Advanta Semillas SAIC, Ruta 33 km 636, CC559, (2900), Venado Tuerto, Santa Fe, Argentina.
C Corresponding author. Email: bgambin@unr.edu.ar; gambin@iicar-conicet.gov.ar
Crop and Pasture Science 68(7) 599-608 https://doi.org/10.1071/CP17015
Submitted: 9 January 2017 Accepted: 13 July 2017 Published: 17 August 2017
Abstract
Effective plant improvement depends on understanding grain yield genotype by environment (G × E) interactions. Studies focusing on more heritable (secondary) traits provide a way for interpreting the nature of these interactions and assist selection by adapting hybrids to specific adaptation patterns. The objective of our study was to explore some specific traits to help describe G × E interactions for yield in grain sorghum. A set of 22 representative hybrids were grown at eight different environments varying mainly in water and nitrogen availability. Studied traits were yield, phenology (time to anthesis and grain-filling duration), numerical yield components (grain number and individual grain weight) and physiological components (biomass at maturity and harvest index).
The G × E interaction to G component variance represented 3.48 for grain yield, 1.03 for grain-filling duration, 0.87 for biomass at maturity, 0.71 for time to anthesis, and less than 0.5 for the rest of the traits. Although the G × E interaction for yield was large, the relative genotypic contribution of most studied traits suggests that G × E interaction is not a major impediment for attaining high selection responses to these traits. Pattern analysis applied to G × E best linear unbiased predictors defined three genotype and three environmental groups. Environments were grouped suggesting different water stress levels during early or pre-flowering stages, whereas genotype groups depicted different yield responses across environmental groups. Phenology differences among genotypes explained a large portion of the G × E interaction throughout its influence on grain weight. Late flowering genotypes performed poorly in terms of grain weight and yield across all environments, showing that these materials are not the best option for our production system. Longer grain filling contributed to grain weight and yield at environments with low stress levels, particularly when combined with intermediate or short maturity. Early materials contributed to grain weight and yield at the highest stressful environments. We provide useful information to sorghum breeders at temperate environments, and described secondary traits that could assist selection at particular environments.
Additional keywords: breeding, indirect selection, Sorghum bicolor (L.) Moench.
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