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Regulating Effects of Exogenous Spermidine on Photosynthetic Character and Antioxidant Metabolism of Soybean Seedling Leaves under Salt Stress(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2016年01期
Page:
45-48
Research Field:
Publishing date:

Info

Title:
Regulating Effects of Exogenous Spermidine on Photosynthetic Character and Antioxidant Metabolism of Soybean Seedling Leaves under Salt Stress
Author(s):
DU Hong-yang1;  2;  HU Chun-hong1;  LIU Huai-pan1
1.College of Life Science and Agronomy/ Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou 466001, China;
2. College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China
Keywords:
Spermidine;  Salt stress;  Soybean seedlings;  Photosynthetic character;  Antioxidant
PACS:
-
DOI:
10.11861/j.issn.1000-9841.2016.01.0080
Abstract:
In order to explore the mechanism that spermidine(Spd) improves soybean seedlings resistance to salt stress, takeing Zhengdou 30 as material, we studied the effects of Spd with different concentration on photosynthetic character and antioxidant metabolism of soybean seedling leaves under salt stress(100 mmol.L-1NaCl) The results are as follows: under salt stress, the relative drought matter increase rate (RDMTR), the activity of antioxidant enzymes (superoxide dismutase: SOD, peroxidase: POD, catalase: CAT, and ascorbic acid oxidase : APX) and photosynthetic parameters (net photosynthetic rate: Pn, stomatal conductance: Gs, intercellular CO2?concentration: Ci, transpiration rate:Ｔr) of soybean seedling leaves significantly decreased, however, relative electrolyte leakage rate (RELR), superoxide anion generation rate(O-2) , hydrogen peroxide（H2O2）and malondialdehyde（MDA）contents increased. But, exogenous Spd with different concentration increased RDMIR, the activity of antioxidant enzymes and photosynthetic parameters of soybean seedling leaves and decreased RELR ,O -2, H2O2and MDA contents, and the increases or decreases are markedly at 0.5mmol.L-1Spd concentration. These results suggest that the appropriate concentration of Spd could decrease O-2generation rate and the contents of H2O2and MDA via increasing the activities of antioxidant enzymes in soybean seedlings and increase photosynthetic efficiency via improving photosynthetic parameters to alleviate the injury of salt stress to soybean seedlings and promote the growth of soybean seedlings.

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Last Update: 2016-01-29