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Developmental controls of morphological mutants of Phaseolus vulgaris L.: Differential expression of mutant loci in plant organs

1981; Wiley; Volume: 2; Issue: 3 Linguagem: Inglês

10.1002/dvg.1020020306

1520-6408

C.T. Shii, Machteld C. Mok, David W. S. Mok,

Legume Nitrogen Fixing Symbiosis

Abstract Developmental controls of morphological mutants of Phaseolus vulgaris L. conditioned by two independent loci, DL 1 and DL 2 , were examined through grafting experiments and hydroponic studies. Phenotypes of mutant classes were duplicated by unions of scions and stocks derived from different genotypes. Results indicate that DL 1 and DL 2 regulate a root and shoot factor respectively, contributing to the mutant types. The allelic dosages of DL 1 in the root and DL 2 in the shoot rather than the genotype of the whole plant per se determine the severity of the mutant expression. Plants heterozygous for both loci with a temperature‐sensitive expression of the mutant phenotype were used to determine physiological components involved. The primary abnormal developmental event associated with the appearance of mutant phenotypes, the restricted root growth at high temperature, could be overcome by the addition of cytokinin in hydroponic solution. These observations suggest that DL 1 and DL 2 may be related to the regulation of hormonal function or metabolism.