In order to investigate new gene resource for enhancing rice tolerance to salt stress, manganese superoxide dismutase gene from halophilic archaeon (Natrinema altunense sp.) (NaMnSOD) was isolated and introduced into Oryza sativa L. cv. Nipponbare by Agrobacterium-mediated transformation. The transformants (L1 and L2) showed some NaMnSOD expression and increased total SOD and CAT activity, which contributed to higher efficiency of ROS elimination under salt stress. The levels of superoxide anion radicals (O 2 ·− ) and hydrogen peroxide (H2O2) were significantly decreased. In addition, they exhibited higher levels of photosynthesis, whereas lower relative ion leakage and MDA content compared to wild-type plants. Therefore, transgenic seedlings were phenotypically healthier, and heterologous expression of NaMnSOD could improve rice salt tolerance.
Russian Journal of Plant Physiology – Springer Journals
Published: Apr 22, 2013
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