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A Comparison of Variance Components in Corn Yield Trials: III. General and Specific Combining Ability and Their Interaction with Locations and Years 1
Author(s) -
Rojas Basilio A.,
Sprague G. F.
Publication year - 1952
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1952.00021962004400090002x
Subject(s) - statistician , yield (engineering) , agricultural experiment station , advice (programming) , agriculture , crop , agricultural science , agronomy , agricultural economics , mathematics , political science , library science , statistics , geography , economics , environmental science , computer science , biology , archaeology , materials science , programming language , metallurgy
THE value of an inbred line in the commercial production of hybrid corn is determined by two factors, the characteristic of the line itself with respect to yielding ability, pollen shedding, disease resistance, etc., and the behavior, of the line in hybrid combinations. Performance in hybrids has been subdivided into two categories; general and specific combining ability. General combining ability (7) has been defined as the average performance of a linejn hybrid combinations and specific combining ability as the:deviations from expectation of the basis of average performance. Variances of general (o^g) and specific (o-s) combining ability have been determined and related to the possible types of gene action involved. The variance for general combining ability includes the additive genetic portion while specific combining ability is usually defined as including the nonadditive genetic portion of the total variance arising largely from dominance and epistatic deviations. In an earlier study estimates were obtained of the relative magnitude of