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Cold Tolerance in Adapted Maize Populations 1
Author(s) -
Mock J. J.,
Eberhart S. A.
Publication year - 1972
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/cropsci1972.0011183x001200040021x
Subject(s) - biology , seedling , sowing , cold tolerance , gene–environment interaction , selection (genetic algorithm) , agronomy , population , genotype , dry weight , zea mays , field experiment , maturity (psychological) , poaceae , botany , gene , genetics , demography , artificial intelligence , sociology , computer science , psychology , developmental psychology
We evaluated two U.S. Corn Belt maize ( Zea mays L.) populations (BSSS2 and BSSS13) for percentage emergence, emergence index (emergence rate), and seedling dry weight in two different “cold” environments: early field planting and growth chamber at constant 1O.OC. Genotypic variances of the traits within environments were large, but genotype ✕ environment interaction was large and significant so that parameter estimates (δ 2 g and h 2 ) from data combined across environments were low. Genotypic correlations suggested that within a population the same, or very similar, genetic systems conditioned cold tolerance in both environments. These genes were independent of genes controlling stand and maturity under “normal” planting conditions. Predicted selection responses indicated field selection for cold tolerance would be more efficient.