Hypoxia and post-aeration alter malondialdehyde content and | 16503
International Research Journals

International Research Journal of Plant Science

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Hypoxia and post-aeration alter malondialdehyde content and proton efflux in root and leaf of sunflower


Sanaz Shokrollahi1, Akbar Mostajeran*1 and Shirin Ahmadi

Saturated soil causes hypoxia which seriously affects the growth of plants through creating oxidative stress and lipid peroxidation. In this study, seventeen days old seedlings of four sunflower cultivars (Lacomca, Record, Progress and Hysun33) were subjected to four days of hypoxia. Plants exposed to hypoxia, re-aerated for four more days as recovery treatment. Plants were sampled daily during hypoxia and two days interval during the recovery period for measuring root and shoot dry weights, malondialdehyde and root proton efflux. Results show that hypoxia causes reduction in dry weight of all cultivars. Although, dry weight reduction in root was higher than shoot, each cultivar responded to hypoxia differently. Lacomca and Progress cultivars with less reduction in root dry weight (almost 18%) showed more tolerance to hypoxia than Record and Hysun33 cultivars (49.4% and 36.1% respectively). Higher amount of root�?¢�?�?��?�?�s MDA in Record (170.6%) and Hysun33 (115.4%) compared to Progress (51.7%) and Lacomca (42.3%) cultivars was correlated to higher root dry weight reduction (49.4% and 36.1% respectively). Although root's MDA was correlated with root dry weight reduction however this trend was not the same in leafs. Re-aeration after 4 days of hypoxia showed reduction in roots and shoots dry weight, MDA and roots proton efflux.

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