Resumo

COSTALES, Daimy; NAPOLES, María C; NUNEZ, Miriam  e  FALCO, A. Influencia de un análogo de brasinoesteroide sobre la nodulación de plántulas de soya (Glycine max (L) Merril). cultrop [online]. 2008, vol.29, n.2, pp. 65-69. ISSN 0258-5936.

Plant hormones control all developing processes, including the beginning, evolution and efficiency of nitrogen fixation in leguminous root nodules through a self-regulating mechanism. However, the substances involved in regulating nodulation have not been fully identified, due to multiple interactions between phytohormones and other signaling compounds (nitric oxide, reactive-oxygen species, jasmonic acid, salicylic acid, uridin, flavonoids and nodulating factors synthesized by rhizobia). Brassinosteroid analogues have a similar mode of action to natural brassinosteroids in plants. The effect of a brassinosteroid analogue (Biobras-16) on soybean (Glycine max L.) seedling in vitro nodulation was evaluated in this investigation. Biobras-16 enhanced the response to Bradyrhizobium-soybean symbiotic interaction when soybean seeds were imbibed, thus obtaining similar or higher values than the control in every nodulation variable analyzed at the concentrations tested (0.01, 0.05 and 0.10 mg.L-1). Nevertheless, when the analogue was added to plant culture media, the number of nodules was reduced compared to control plants. Results prove the use of a brassinoesteroid analogue to improve the response of Bradyrhizobium-soybean symbiotic interaction by previously imbibing soybean seeds

Palavras-chave : nodulation; soybean; brassinosteroids.

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