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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2020, Vol. 42 ›› Issue (3): 461-.doi: 10.19802/j.issn.1007-9084.2019188

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Alleviation effects of exogenous strigolactone on growth of Brassica napus L. seedling under drought stress

  

  1. 1. Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences / Key Laboratory of Biology and Ge⁃
    netic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan 430062, China; 2. College of Life Sciences, Hubei University, Wuhan 430062, China
  • Online:2020-06-28 Published:2020-06-08

Abstract:

In order to reveal the alleviating effect of exogenous strigolactone (SLs) on drought stress in rape seeding stage, a pot experiment with Zhongshuang 11(Brassica napus L.) was conducted to study the effects of 0.18 μmol/L SLs on growth, photosynthetic rate, antioxidant system and osmotic regulators in rapeseed under well water supply and drought stress. The results showed that exogenous SLs could effectively alleviate the inhibition of drought stress on growth of rapeseed seedlings. Compared with drought stress, SLs treatment effectively increased the dry
matter accumulation by 21.13%. The chlorophyll content and net photosynthetic rate of leaves increased by 9.37% and 90.65%, respectively. Moreover, the soluble sugar and proline content increased by 26.53% and 25.28%, respec⁃ tively. The activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) increased by 12.58%,12.04% and 12.61%, respectively. The contents of antioxidant ascorbic acid (ASA) and glutathione (GSH) increased by 14.15% and 18.96%, respectively. The ratios of ASA/DHA and GSH/GSSG increased either. The levels of reac⁃
tive oxygen species decreased significantly, the hydrogen (H2O2) content and superoxide anion radical (O2·-) produc⁃ tion rate decreased by 11.18% and 15.28%, respectively, and effectively reduced the malondialdehyde (MDA) con⁃tent in leaves and alleviated membrane damage caused by drought stress. In conclusion, SLs treatment can acceler⁃ate the chlorophyll synthesis rate, enhance photosynthetic capacity and antioxidant capacity of leaves, promote the growth of rapeseed seedlings, and effectively improve the drought resistance in rape seedlings stage.

Key words: Brassica napus L., drought stress, strigolactone, antioxidant system

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