Journal of Food, Agriculture and Environment

Relationship between proline metabolism and NAD kinase in green bean plants subjected to short-term salt stress

Author(s):

Juan M. Ruiz ^*, Rosa M. Rivero, Luis Romero

Recieved Date: 2004-08-18, Accepted Date: 2004-11-11

Abstract:

The aim of the study was to determine whether short-term salt stress increases concentration of cytoplasmic Ca²⁺ ([Ca²⁺]_cyt) by activating the enzyme Ca²⁺-calmodulin-dependent nicotinamide adenide dinucleotide kinase (Ca²⁺-CaM-NAD kinase; EC 2.1.7.23), and whether these stress-induced variations trigger changes in the adaptive response of plants, as in proline metabolism. To address this question, we subjected 15-d-old green bean plants to salt stress (250 mM of NaCl) for 3 h. Plants showed foliar accumulation of proline, defining the enzymes Δ¹-pyrroline-5-carboxylate synthetase (P5CS; EC 2.7.2.11/1.2.2.41) and proline dehydrogenase (PDH; EC 1.5.99.8) as determinant in the foliar accumulation of this amino acid during salt stress. In addition, we found a close relationship between Ca²⁺-CaM-dependent NAD kinase and proline metabolism, suggesting that the adaptive responses or acclimation of plants under salt stress are preceded by an increase in the concentration of cytoplasmic Ca²⁺.

Keywords:

Adaptative response, salt stress, NAD kinase, Phaseolus vulgaris, proline metabolism

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Journal: Journal of Food, Agriculture and Environment
Year: 2005
Volume: 3
Issue: 1
Category: Agriculture
Pages: 195-198

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