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Basis of Yield Component Compensation in Crop Plants With Special Reference to the Field Bean, Phaseolus vulgaris¹

Negative correlations among yield components are wide spread among the major crop plants, particularly under various kinds of environmental stress. The correlations are believed to be developmental rather than genetic per se, and are postulated to be caused by genetically independent components, developing in a sequential pattern, that are free to vary in response to either 1) a limited constant input of metabolites, or 2) an oscillatory input of these substances such that input is limiting at critical stages in the developmental sequence.

Key Words: Phaseolus vulgaris • field bean • component compensation • developmental sequence • nutritional unit

² Professor of Crop Science. The author thanks Drs. J. E. Grafius and C. M. Harrison for their interest in and helpful criticisms of some of the ideas expressed in this manuscript.

Received for publication March 25, 1967.

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