Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : The effects of chemical preconditioning on physiological changes in drought-stressed plants

Auteur : Islam, Md. Anisul

Université de soutenance : University of Toronto,

Grade : (M.Sc.) 1999.

Résumé
The use of antisenescence compounds to precondition seedlings was studied in white pine (Rnus stmbus L.). In a preliminary study, the effectiveneos of eight compounds were tested by their ability to prevent desiccation-induced membrane leakage in Phasedus vulgaris. Men fed through the xylem and roots, Ambiol, spemine and aminaethoxyvinylgl ycine prevented the dedine in water potential under drought in white pine seedlings. These mpounds also ameliorated gas exchange, reduœd membrane leakage and inhibited ethylene production under drought. Ambiol stimulated osmotic adjustment and inhibited transpiration. Spemiine increased elastic adjustment, enhanced photosynthesis and water use effidency. These results showed that preconditioning impioved water relations and gas exchange. The ability of these compounds to delay key senescena readions in white pine was shown by the reductions in ethylene production and membrane leakage. Preconditioning with antisenescenœ agents may thus be a viable option to enhance suvival and growlh of seedling transplants.

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