© 1995 Oxford University Press
RESEARCH-ARTICLE |
The role of sucrose synthase in the response of soybean nodules to drought
1Departamento de Ciencias del Medio Natural, Universidad Pública de Havana, Campus Arrosadia E-31006 Pamplona, Spain
2Department of Cell Biology, Institute of Grassland and Environmental Research, Plas Gogerddan Aberystwyth, Dyfed SY23 3EB, UK
3To whom correspondence should be addressed. Fax: +34 48 169169. E-mail: cesarai{at}upna.es and gordont{at}bbsrc.ac.uk
Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules. Gradual drought stress, imposed by withholding water nutrients, resulted in declines in the water potential of leaves and nodules consistent with a significant decline in N2 fixation. However, the amounts of nitrogenase components 1 and 2 were virtually unaffected by drought stress. Similarly, no significant changes could be detected in aspartate aminotransferase, phosphoenolpyruvate carboxylase, glutamine synthetase or alkaline invertase activities throughout the experiment. In contrast, sucrose synthase (SS), one of the enzymes involved in sucrose metabolism in legume nodules, declined dramatically in activity and in content within a few days of withholding water. Coincident with this decline in SS activity were significant increases in the nodule contents of sucrose, total free amino acids and ureides. The amounts of proline, however, did not increase until some days later. It is suggested that SS may play a key role in the regulation of nodule carbon metabolism and, therefore, of nitrogen fixation under drought stress conditions.
Key words: Glycine max, soybean, nodule metabolism, drought stress, sucrose synthase
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