期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 47, 期 7, 页码 570-577出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2009.02.009
关键词
Alfalfa; Antioxidant enzymes; Drought; Germination; Salt
资金
- Knowledge Innovation Engineering of the Chinese Academy of Sciences [KZCX3-SW444]
- Plan for Outstanding Personnel of Northwest AF University
- National Basic Research Program of China [2009CB118604]
- Korea Foundation for International Cooperation of Science & Technology (KICOS)
- MEST
- KRIBB Initiative Program
To understand the adaptability of alfalfa (Medicago sativa L.) to environmental stresses, we analyzed the activity of several antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD), ascorbate peroxidase (APX), and catalase (CAT), in alfalfa shoots and roots subjected to salt and drought stresses during germination. The germination rate of six alfalfa cultivars was comparatively studied under 200 mM NaCl or 35% PEG treatment. Alfalfa Xinmu No. 1 and Northstar varieties were selected as stress-tolerant and -sensitive cultivars, respectively, and were used for further characterization. After NaCl or PEG treatment, Xinmu No. I showed enhanced seedling growth, compared with Northstar. Xinmu No. I also exhibited low levels of hydrogen peroxide (H2O2) production and lipid peroxidation, compared with Northstar. In addition, Xinmu No. 1 showed higher enzymatic activity of SOD, APX, CAT, and POD in its shoots and roots than Northstar. These results seem to indicate that Xinmu No. 1 cultivar's tolerance to salt or drought stresses during germination is associated with enhanced activity of antioxidant enzymes. This study highlights the importance of antioxidant enzymes in the establishment of alfalfa seedlings under drought and salinity conditions typical of desertification. (C) 2009 Elsevier Masson SAS. All rights reserved.
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