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Root‐Pulling Resistance and its Relationship to Grain Yield in F 1 Hybrids of Maize 1
Author(s) -
Peters D. W.,
Shank D. B.,
Nyquist W. E.
Publication year - 1982
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/cropsci1982.0011183x002200060007x
Subject(s) - diallel cross , biology , hybrid , grain yield , zea mays , agronomy , yield (engineering) , resistance (ecology) , selection (genetic algorithm) , horticulture , materials science , artificial intelligence , computer science , metallurgy
In 1977 and 1978, all possible single‐cross hybrids between 12 maize ( Zea mays L.) inbreds were evaluated for root‐pulling resistance and yield at plant densities of 38,500 and 55,300 plants per ha. Griffing's diallel analysis was used to determine the nature of genetic effects responsible for production of a large root system as estimated by root‐pulling resistance. Both additive and nonadditive genetic effects contributed significantly (P < 0.01) to the expression of root‐pulling resistance. General combining ability effects interacted significantly (P < 0.01) with environmental changes caused by plant densities and by years, in particular. These interactions may reduce effectiveness of selection for root size based on root‐pulling resistance. The correlation of root‐pulling resistance to grain yield was not significant in either year at either plant density, suggesting that selection for increased root size to gain increased corn rootworm tolerance would not result in decreased grain yield.