Evidence for carbon flux shortage and strong carbon/nitrogen interactions in pea nodules at early stages of water stress |
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Authors: | Gálvez Loli González Esther M Arrese-Igor Cesar |
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Affiliation: | Departamento de Ciencias del Medio Natural, Universidad Pública de Navarra, Campus de Arrosadía, E-31006 Pamplona, Spain. |
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Abstract: | Symbiotic N2 fixation in legume nodules declines under a widerange of environmental stresses. A high correlation betweenN2 fixation decline and sucrose synthase (SS; EC 2.4.1.13) activitydown-regulation has been reported, although it has still tobe elucidated whether a causal relationship between SS activitydown-regulation and N2 fixation decline can be established.In order to study the likely C/N interactions within nodulesand the effects on N2 fixation, pea plants (Pisum sativum L.cv. Sugar snap) were subjected to progressive water stress bywithholding irrigation. Under these conditions, nodule SS activitydeclined concomitantly with apparent nitrogenase activity. Thelevels of UDP-glucose, glucose-1-phosphate, glucose-6-phosphate,and fructose-6-phosphate decreased in water-stressed nodulescompared with unstressed nodules. Drought also had a markedeffect on nodule concentrations of malate, succinate, and |
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