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拟南芥保卫细胞中茉莉酸甲酯诱导的H₂O₂产生与MAPK信号转导体系的可能关系

The Methyl Jasmonate-induced H₂O₂ Generation and Relation to MAPK Sig-nal Transduction System in Arabidopsis thaliana Guard Cells

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【Author】 BO Hui, WANG Peng-Tao, DOND Fa-Cai*, SONG Chun-PengKey Laboratory of Plant Stress Biology of Henan Province, College of Life Science, Henan University, Kaifeng, Henan 475001,China

【机构】河南大学生命科学学院；河南省植物逆境生物学重点实验室；河南省植物逆境生物学重点实验室河南开封475001；河南开封475001；河南开封475001；

【摘要】蛋白激酶MEK1/2的专一抑制剂PD98059可抑制茉莉酸甲酯(MeJA)诱导的拟南芥保卫细胞中H2O2的产生和气孔的关闭。MeJA和H2O2诱导气孔关闭后,再用PD98059处理,可使关闭的气孔重新开放,同样,外源PD98059处理,能使MeJA诱导增强的H2O2探针的荧光强度降低。此结果表明,类属于MAPKK的蛋白激酶MEK1/2参与了MeJA诱导的拟南芥气孔关闭的信号转导过程,其作用机制可能是通过调节MeJA诱导保卫细胞产生和积累H2O2而起作用。更多还原

【Abstract】 The specific inhibitor PD98059 of MEK1/2 could inhibit the H2O2 production and stomatal closureinduced by methyl jasmonate (MeJA) in guard cells of Arabidopsis thaliana. After stomatal closure induced byMeJA and H2O2, PD98059 treatment could induce reopening of close stomata, in the meantime, the fluores-cence intensity of H2O2 probe dichlorofluorescein (DCF) decreased. These results indicated that the MEK1/2involved in the mitogen-activated protein kinase (MAPK) signal transduction system of stomatal closure in-duced by MeJA and mediated the H2O2 generation in guard cells of Arabidopsis thaliana.更多还原