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SM ISO690:2012 ŞTEFÎRŢĂ, Anastasia, MELENCIUC, Mihail, BUCEACEAIA, Svetlana. Senescenţa la plantele expuse secetei-proces natural sau patologic. In: Buletinul Academiei de Ştiinţe a Moldovei. Ştiinţele vieţii, 2011, nr. 2(314), pp. 89-98. ISSN 1857-064X. |
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Buletinul Academiei de Ştiinţe a Moldovei. Ştiinţele vieţii | ||||||
Numărul 2(314) / 2011 / ISSN 1857-064X | ||||||
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Pag. 89-98 | ||||||
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A relationship between water status, oxidative stress, the activity of antioxidant enzymes and the aging process has been studied in various areas of the leaf blade of Zea mays L. plants, hybrids P458 and H5R515 with different drought resistance potential. The involvement of free radicals and oxidative stress in induction of plant tissue aging and the role of water in the prevention of premature aging processes have been found. The effect is realized through quenching of the reactive oxygen types formed and maintenance of the antioxidant enzyme activity at high levels. Tissue dehydration during drought results in oxidative stress, which, in turn, induces a series of events related to the growth interruption, the damage and loss of cell structure, and the death of plant organs. Tissue dehydration and aging process are accompanied by a significant intensification of lipid peroxidation and malondialdehyde content increase, while the activity of antioxidative enzymes becomes insufficient to neutralize the reactive oxygen types formed. The plant aging process in drought conditions is pathological and develops at a faster rate in comparison with the natural process, that advances at a certain development stage. |
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