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Genotype and Genotype × Environment Interaction Effects on Forage Yield and Quality of intermediate Wheatgrass in Swards
Author(s) -
Vogel Kenneth P.,
Reece Patrick E.,
Nichols James T.
Publication year - 1993
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1993.0011183x003300010004x
Subject(s) - biology , forage , genotype , cultivar , gene–environment interaction , agronomy , dry matter , yield (engineering) , trait , zoology , genetics , gene , materials science , computer science , metallurgy , programming language
Genetic differences among cultivars or strains for specific traits can be significantly reduced or increased by differential genotypic responses to environments. The objective of this study was to determine the relative magnitude of genotype and genotype × environment interaction effects, which are due to differential responses, on forage yield and quality of intermediate wheatgrass [ Thinopyrum intermedium (Host) Barkworth & D.R. Dewey] when grown in seeded swards in the central Great Plains. Thirty‐four strains (genotypes), which included cultivars, experimental strains, and PI lines, were grown in replicated trials at Mead, North Platte, and Alliance, NE. The three sites differed markedly in precipitation and length of growing season. There were significant differences among strains for all evaluated traits. Genotype & location and genotype & year interaction effects were not significant for in vitro dry matter digestibility (IVDMD), indicating that this trait is quite stable across environments. Genotype & location interaction effects were significant for forage yield and protein concentration; genotype & year effects were significant for forage yield. Spearman rank correlations, used to test for consistency of ranking of the strains across environments, were high and significant for IVDMD, but were low and usually not significant for forage yield. Improving IVDMD should be emphasized in intermediate wheatgrass breeding programs, since there is substantial genetic variation for IVDMD, it is stable across environments, and it can improve livestock production per hectare.