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Inheritance and Association of Plant Height and Its Components in a Soybean Cross 1
Author(s) -
Caviness C. E.,
Prongsirivathana Chamras
Publication year - 1968
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/cropsci1968.0011183x000800020026x
Subject(s) - plant stem , biology , main stem , heritability , dominance (genetics) , shoot , horticulture , botany , agronomy , gene , genetics
Inheritance and association of plant height and its components were studied in a soybean ( Giycine max (L.) Merr.) cross, ‘Lee’ ✕ 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 F 2 generation which possessed a large node number and short average internode length. By intensive selection in progenies from these plants in the F 3 , and F 4 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.