期刊
ECOLOGY AND EVOLUTION
卷 8, 期 11, 页码 5724-5740出版社
WILEY
DOI: 10.1002/ece3.4112
关键词
28-homobrassinolide; antioxidants; arbuscular mycorrhizal fungi; cucumber; NaCl stress
资金
- Xi'an City Agricultural Sci-Tech Innovation Project [NC1501(1)]
- Shaanxi Provincial Agricultural Sci-Tech Innovation and Development Project [2016NY-048]
- Shaanxi Provincial Sci-Tech Innovation Project [2016KTCL02-01]
Salinity is one of the major obstacles in the agriculture industry causing huge losses in productivity. Several strategies such as plant growth regulators with arbuscular mycorrhizal fungi (AMF) have been used to decrease the negative effects of salt stress. In our experiment, 28-homobrassinolide (HBL) with spraying intervals was combined with AMF (Glomus versiforme) in cucumber cultivars Jinyou 1(#) (salt sensitive) and (Changchun mici, in short, CCMC, salt tolerant) under NaCl (100mmol/L). Studies have documented that the foliar application of HBL and AMF colonization can enhance tolerance to plants under stress conditions. However, the mechanism of the HBL spraying intervals after 15 and 30 days in combination with AMF in cucumber under salt stress is still unknown. Our results revealed that the HBL spraying interval after 15days in combination with AMF resulted in improved growth, photosynthesis, and decreased sodium toxicity under NaCl. Moreover, the antioxidant enzymes SOD (superoxide dismutase; EC 1.15.1.1) and POD activity (peroxidase; EC 1.11.1.7) showed a gradual increase after every 10days, while the CAT (catalase; EC 1.11.1.6) increased after 30days of salt treatments in both cultivars. This research suggests that the enhanced tolerance to salinity was mainly related to elevated levels of antioxidant enzymes and lower uptake of Na+, which lowers the risk of ion toxicity and decreases cell membrane damage.
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