Physiological Evaluation of Drought Stress Tolerance and Recovery in Cauliflower (Brassica oleracea L.) Seedlings Treated with Methyl Jasmonate and Coronatine |
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Authors: | Huiling Wu Xiaoli Wu Zhaohu Li Liusheng Duan Mingcai Zhang |
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Institution: | (1) State Key Laboratory of Plant Physiology and Biochemistry, Department of Agronomy, China Agricultural University, No. 2 Yuanmingyuan Xi Lu, Haidian, Beijing, 100193, People’s Republic of China;(2) Service Center for Societies, China Association for Science and Technology, Beijing, 100081, People’s Republic of China; |
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Abstract: | Coronatine (COR) is a chlorosis-inducing phytotoxin that mimics some biological activities of methyl jasmonate (MeJA). Although
MeJA has been reported to alleviate drought stress, it is unclear if COR has the same ability. Our objective was to determine
the influence of exogenously applied MeJA and COR on the growth and metabolism of cauliflower seedlings under drought stress
and recovery. Both MeJA and COR enhanced the growth and accumulation of dry matter in cauliflower seedlings during drought-stressed
and rewatering conditions. Treatment with MeJA or COR enhanced tolerance of drought stress through increased accumulation
of chlorophyll and net photosynthetic rate. Enzymatic (superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, and
glutathione reductase) and nonenzymatic antioxidant (proline and soluble sugar) systems were activated, and lipid peroxidant
(malondialdehyde and hydrogen peroxide) was suppressed by MeJA and COR under drought stress. MeJA and COR also increased leaf
relative water content and endogenous abscisic acid level under drought-stressed conditions. After rewatering, the contents
of leaf water, chlorophyll, abscisic acid, and photosynthetic characteristics as well as enzymatic and nonenzymatic antioxidant
systems showed nearly complete recovery. Both MeJA and COR can alleviate the adverse effects of drought stress and enhance
the ability for water stress resistance through promotion of defense-related metabolism in cauliflower seedlings. |
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