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A Mutable Gene System in Phaseolus vulgaris L. 1
Author(s) -
Coyne Dermot P.
Publication year - 1966
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/cropsci1966.0011183x000600040001x
Subject(s) - biology , phaseolus , gene , genetics , gene pool , microbiology and biotechnology , botany , population , demography , sociology , genetic diversity
Variegated plants were observed in the F 2 progeny of the Phaseolus vulgaris crosses ‘Yellow Eye PI 209086’ ✕ ‘G.N. Nebraska #1’ and ‘Dark Red Kidney’ ✕ G.N. Nebraska #1. In some environments a phenotypic ratio of 63 normal : 1 variegated plant was observed in the F 2 , while a 15:1 ratio was found in other enviromnents. The data suggest that the somatic instability which produced the variegated character was due to the action of two genes, one being unstable in the presence of a mutator gene. The third gene apparently had a threshold effect and was only expressed under some conditions. The environment‐sensitive gene was designated as “ var ,” the mutator gene as “ mu ,” and the unstable gene as “ us .” Each of the parents lacked the mutator‐unstable gene complex for the development of the character. No variegated plants were found in the F 2 of Dark Red Kidney ✕ PI 209806, which indicated that each of these parents possessed either the unstable gene or the mutator gene, but not both. Proposed crosses are discussed by which it is planned to distinguish whether G.N. Nebraska #1 carries the unstable gene or the mutator gene.