Data/hora: 24/06/2024 11:30:00

Biblioteca(s): | Embrapa Soja.
Data corrente: | 22/06/1993
Data da última atualização: | 27/05/2019
Autoria: | HUNGRIA, M.; PHILLIPS, D. A.
Afiliação: | EMBRAPA-CNPSo, Cx. Postal 1061, CEP 86001-970, Londrina, PR, Brasil.
Título: | Effects of a seed color mutation on rhizobial nod-gene-inducing flavonoids and nodulation in common bean.
Ano de publicação: | 1993
Fonte/Imprenta: | Molecular Plant-Microbe Interactions, v.6, n.4, p.418-422, 1993.
Idioma: | Inglês
Conteúdo: | A white-seeded mutant of common bean (Phaseolus vulgaris L. PI 165426WS) differed from its isogenic black-seeded parent, PI 165426CS, in the amounts and types of flavonoid nod-gene inducers released from the seed and in the pattern of root nodules formed by Rhizobium tropici CIAT 899 and by R. leguminosarum bv. phaseoli CNPAF 512. Comparisons of 14-day-old plants developing from black (CS) and white (WS) seeds showed that although there were no differences in any plant growth parameter measured, CS plants had at least 80% more nodules on the primary root. Rinsing seeds before planting decreased nodulation at the top of the primary root in CS, but not WS, seedlings. A direct role for seed compounds in the nodulation differences was supported by the fact thatrinses from CS seeds induced 10-fold higher beta-galactosidase activity from a nodA::lacZ fusion in R. leguminosarum bc. phaseoli than WS seed rinses. Analytical chemistry techniques showed that WS seeds lacked five nod-gene-inducing anthocyanins previously identified on CS seeds. WS seed rinses contained five nod-inducing flavonol glycosides released by CS seeds, but only 45% as much of those compounds was present. The nod-gene-inducing activity of WS root wxudates, however, was much more similar to that from CS roots both quantitatively and qualitatively. Adding 20 micromoles of malvidin-3-O-glucoside or quercetin-3-O-glucoside to WS seeds inoculated either with CIAT 899 or with CNPAF 512 increased nodulation by at least 40%, but malvidin and quercetin...
Palavras-Chave: | Bean; Flavanoid.
Thesagro: | Feijão; Flavonóide; Nodulação; Phaseolus Vulgaris; Rhizobium Leguminosarum.
Thesaurus Nal: | nodulation.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (13827-1) - UPC - SP - -- - 10400 -  - 10400 - DIS