Ureides level in soybean plants with differents inoculants and water deficit

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Published: Jul 5, 2012
Keywords:
soybean, Bradyrhizobium, water deficit, ureides, nodulation factors

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José A. Freixas Coutin
Instituto Nacional de Ciencias Agrícolas

Abstract

Soybean [Glycine max (L.) Merr.] establishessymbiosis with N2 fixing bacteria from Rhizobia group, such asBradyrhizobium sp. Nitrogen fixed in nodules is transferred toleaves as ureides, these molecules are able to increase its levelsin soybean leaves under drought stress. Indeed, biologicalnitrogen fixation in soybean is especially sensitive to droughtand ureides seem to be involved through a negative feedbackfrom leaves to nodules. In addition, induction of nodulationgenes in Bradyrhizobium sp. has positive effects in soybeangrowth under moderate drought stress. The goal of this workis to study ureides level in soybean with different inoculantsin response to water deficit. Soybean plants (cv. INCAsoy27)were firstly grown in nutrient solution during 15 days.Afterwards, they were drought stressed for a 20 days periodadding 10 % PEG 6000. Bradyrhizobium elkanii ICA 8001 wasthe strain cultivated with the purpose of inoculating soybeanplants. This strain was separately grown in three culturemedia, two of them induced in nodulation factor productionand the other one without induction. A statistically significantincrease of ureides level in leaves and nodules was observedin plants with water deficit and inoculants without nodulationfactor induction (NFI). However, this increase was not observedin plants drought stressed and inoculated with the strainpreviously induced in nodulation factor production. It mightsuggest an important role of NFI in soybean ureides levelregulation under drought conditions. At the end of the stressperiod, the activity of the enzyme glutamine synthetase insoybean nodules was measured, but there were no statisticallysignificant differences among each treatment with NFI,although differences were reported between non-stressed andstressed soybean plants inoculated with B. elkanii ICA 8001without NFI.

Article Details

How to Cite
Freixas Coutin, J. A. (2012). Ureides level in soybean plants with differents inoculants and water deficit. Cultivos Tropicales, 32(2), 35–43. Retrieved from https://ediciones.inca.edu.cu/index.php/ediciones/article/view/66
Issue
Vol. 32 No. 2 (2011)
Section
Original Article

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