Journal
PLANT BIOTECHNOLOGY REPORTS
Volume 3, Issue 4, Pages 301-307Publisher
SPRINGER
DOI: 10.1007/s11816-009-0102-y
Keywords
Alfalfa; Antioxidant enzymes; Chilling stress; Germination; Lipid peroxidation
Funding
- Knowledge Innovation Engineering of the Chinese Academy of Sciences [KZCX3-SW-444]
- Plan for Outstanding Personnel of Northwest A F University
- National Basic Research Program of China [2009CB118604]
- Korea Foundation for International Cooperation of Science and Technology (KICOS)
- MEST
- KRIBB
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To understand the adaptability of alfalfa (Medicago sativa L.) to chilling stress, we analyzed the antioxidative mechanism during seed germination. The germination rates of six alfalfa cultivars were studied comparatively at 10A degrees C. Xinmu No. 1 and Northstar were selected as chilling stress-tolerant and stress-sensitive cultivars for further characterization. After chilling treatment, Xinmu No. 1 showed higher seedling growth than Northstar. Xinmu No. 1 exhibited low levels of hydrogen peroxide and lipid peroxidation compared with Northstar. In addition, shoots in Xinmu No. 1 treated with chilling showed higher activities of the superoxide dismutase, ascorbate peroxidase (APX), and catalase than those of Northstar, whereas Xinmu No. 1 showed higher APX activity in roots that Northstar. These results indicated that high antioxidation activity in Xinmu No. 1 under chilling stress is well associated with tolerance to chilling condition during germination.
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