Effects of Exogenous Methyl Jasmonate on Photosynthesis and Physiological Characteristics of Scutellaria regeliana under Drought Stress

doi:10.7525/j.issn.1673-5102.2020.03.006

Abstract

Abstract: The effects of exogenous application of different concentrations(0.1, 0.5, 1 and 2 mmol·L^-1) of methyl jasmonate on phenotypic characteristics and photosynthesis and physiological characteristics under 15% PEG-6000 stress were studied with the Scutellaria regeliana as experimental materials. The results showed that:exogenous application of methyl jasmonate enhanced the net photosynthetic rate, stomatal conductance and transpiration rate of S.regeliana. It mainly plays a role in promoting these and effectively reduces the damage level of the S.regeliana. The intercellular CO₂ concentration was decreased, and the effect of 2 mmol·L^-1 methyl jasmonate on the net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO₂ concentration of S.regeliana was the most significant. The free proline content of the treatment group lower than CK. The soluble protein content lower than CK in the first 6 d treatment, and was significantly higher than that of CK after 6 d treatment. Exogenous application of methyl jasmonate can increase the activity of SOD, POD and CAT as a whole. The results of photosynthetic parameters and physiological indexes of S.regeliana showed that exogenous application of methyl jasmonate could effectively alleviate the adverse effects of drought stress on S.regeliana.

Key words: Scutellaria regeliana, PEG-6000, methyl jasmonate, photosynthetic characteristics, physiological index

CLC Number:

S567.239

WU Jian-Hui, FAN Wei-Fang, NIU Zhe, ZHANG Jing, GAO Peng-Fei, LI Wen. Effects of Exogenous Methyl Jasmonate on Photosynthesis and Physiological Characteristics of Scutellaria regeliana under Drought Stress[J]. Bulletin of Botanical Research, 2020, 40(3): 360-367.

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