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Proline metabolism in response to nitrogen deficiency in French Bean plants (Phaseolus vulgaris L. cv Strike)
Authors:Esteban Sánchez  Pablo C. Garcia  Luis R. López-Lefebre  Rosa M. Rivero  Juan Manuel Ruiz  Luis Romero
Affiliation:(1) Department of Plant Biology, Faculty of Sciences, University of Granada, Spain
Abstract:
The objective of the present work was to determine the impact ofnitrogen deficiency on proline metabolism in French Bean plants(Phaseolus vulgaris L. cv. Strike). The nitrogen wasapplied to the nutrient solution in the form of NH4NO3 at1.45 mM (N1), 2.90mM (N2) and 5.80mM (N3, optimal level). Our results indicateNdeficiency is characterised by a decline in proline accumulation both in theroot and leaves, fundamentally because proline degradation is encouraged by thestimulation of the enzyme proline dehydrogenase. By contrast, under conditionsof adequate N (N3), proline levels rise due to the action of ornithine,suggesting predominance of the ornithine pathway over the glutamine pathway, inaddition to the inhibition of proline dehydrogenase activity.
Keywords:French Bean  Nitrogen  Phaseolus vulgaris  Proline metabolism
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