Mitogen-activated protein kinase is involved in abscisic acid-induced antioxidant defense and acts downstream of reactive oxygen species production in leaves of maize plants

Plant Physiology
A-Ying ZhangXiuli Hu

Abstract

The role of mitogen-activated protein kinase (MAPK) in abscisic acid (ABA)-induced antioxidant defense was investigated in leaves of maize (Zea mays) plants. Treatments with ABA or H(2)O(2) induced the activation of a 46-kD MAPK and enhanced the expression of the antioxidant genes CAT1, cAPX, and GR1 and the total activities of the antioxidant enzymes catalase, ascorbate peroxidase, glutathione reductase, and superoxide dismutase. Such enhancements were blocked by pretreatment with several MAPK kinase inhibitors and reactive oxygen species inhibitors or scavengers. Pretreatment with MAPK kinase inhibitors also substantially arrested the ABA-induced H(2)O(2) production after 2 h of ABA treatment, but did not affect the levels of H(2)O(2) within 1 h of ABA treatment. Pretreatment with several inhibitors of protein tyrosine phosphatase, which is believed to be a negative regulator of MAPK, only slightly prevented the ABA-induced H(2)O(2) production, but did not affect the ABA-induced MAPK activation and ABA-enhanced antioxidant defense systems. These results clearly suggest that MAPK but not protein tyrosine phosphatase is involved in the ABA-induced antioxidant defense, and a cross talk between H(2)O(2) production and MAPK activa...Continue Reading

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Citations

Jul 26, 2012·Cellular and Molecular Life Sciences : CMLS·Hiroaki Fujii, Jian-Kang Zhu
Apr 19, 2013·Plant Molecular Biology·Shimon Gepstein, Bernard R Glick
Oct 2, 2013·Journal of Food Science and Technology·Ramkishan ChoudharyP L Swarnkar
Nov 26, 2013·Plant Science : an International Journal of Experimental Plant Biology·Prasad MelvinKukkundoor Ramachandra Kini
Jun 19, 2012·AoB Plants·Veselin Dimitrov Petrov, Frank Van Breusegem
May 4, 2012·Journal of Experimental Botany·Mohammad Reza Bolouri Moghaddam, Wim Van den Ende
Mar 5, 2015·Ecotoxicology·Claudia CinigliaMilena Petriccione
Jun 23, 2015·Plant Biotechnology Journal·Fangfang MaMingyi Jiang
Dec 24, 2015·Frontiers in Plant Science·Jun You, Zhulong Chan

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