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Inheritance and Association of Plant Height and Its Components in a Soybean Cross¹

Inheritance and association of plant height and its components were studied in a soybean (Giycine max (L.) Merr.) cross, ‘Lee’ x R61-900, at Fayetteville, Arkansas. Effectiveness of selection for plants possessing a large number of nodes on the main stem and short average internode length was evaluated. A single major gene pair appeared to condition node number on the main stem, and this component had a greater effect on plant height at maturity than average internode length. A high degree of phenotypic dominance was evident for node number and plant height. Frequency distributions for average internode length gave no evidence for any type of discrete segregation. Heritability estimates were relatively high for both node number and plant height, but somewhat lower for average internode length. Although there was a close association between node number and plant height, two plants were observed in the F₂ generation which possessed a large node number and short average internode length. By intensive selection in progenies from these plants in the F₃, and F₄ generations, true breeding types were isolated which were less than 90 cm in height and contained more than 20 nodes on the main stem. It appeared that selection had been effective in isolating partially indeterminate types which possessed rather short internodes.

Key Words: node number • internode length • determinate growth habit • indeterminate growth habit • selection

² Associate Professor, Department of Agronomy, and former graduate student (now employed in Plant Breeding Division, Ministry of Agriculture, Bangkok, Thailand), University of Arkansas, Fayetteville, Ark.

Received for publication September 5, 1967.