Effect of nitrogen deficiency, salinity and drought on proline metabolism in Sesuvium portulacastrum
Drought and high salinity are responsible for large decreases in crop productivity all over theworld . These losses of crop yield result from limitations of plant development through excessive ion accumulation, water deficit and mineral deficiencies . Under these prevalent stresses, tolerant plants adopt various strategies with a wide range of biochemical to physiological and morphological adaptations . Morphological ones include modifications in growth and allocation of assimilates towards roots for an efficient exploitation of soil nutrients . The physiological strategy is represented by a higher selectivity for K+ over Na+ , an increase in K+-use efficiency , and the synthesis of organic osmolytes, with low molecular weight, for osmo-protection . These osmolytes are sugars, polyols, amino acids, tertiary and quarternary ammonium, and tertiary sulphonium compounds .
KeywordsGlycine Betaine Proline Concentration Proline Biosynthesis Proline Metabolism Proline Dehydrogenase
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