title: Lack of K-Dependent Oxidative Stress in Cotton Roots Following Coronatine-Induced ROS Accumulation.
abstract: Coronatine [COR] is a novel type of plant growth regulator with similarities in structure and property to jasmonate. The objective of this study was to examine the relationship between increased root vitality induced by 10 nM COR and reactive oxygen species scavenging under potassium (K)-replete (2.5 mM) and K-deficient (0.05 mM) conditions in hydroponic cultured cotton seedlings. K-replete and K-deficient conditions increased root vitality by 2.7- and 3.5-fold, respectively. COR treatment significantly decreased lipid peroxidation in cotton seedlings determined by reduction in MDA levels. These results suggest that COR improves the functioning of both enzymatic and non-enzymatic antioxidant systems. Under K-replete and K-deficient conditions, COR significantly increased the activities of antioxidant enzymes SOD (only for K-repletion), CAT, GPX, and APX comparing; COR also significantly increased DPPH-radical scavenging activity. However, COR led to 1.6- and 1.7-fold increases in superoxide anion (O2•-) concentrations, and 5.7- and 2.1-fold increases in hydrogen peroxide (H2O2) levels, respectively. Additionally, COR intensified the DAB staining of H2O2 and the NBT staining of O2•-. Therefore, our results reveal that COR-induced ROS accumulation stimulates the activities of most antioxidant enzymes but does not induce oxidative stress in cotton roots.
authors.affiliation: Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, China.
authors.forename: Zebing
authors.initials: Z
authors.lastname: Hu
authors.affiliation: Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, China.
authors.forename: Sufang
authors.initials: S
authors.lastname: Wang
authors.affiliation: Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, China.
authors.forename: Jinbao
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, China.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Wang
authors.affiliation: Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, China.
authors.forename: Qinglian
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, China; Department of Biology, East Carolina University, Greenville, NC, 27858, United States of America.
authors.forename: Baohong
authors.initials: B
authors.lastname: Zhang
mesh_terms: D000596:Amino Acids / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology*; D003368:Gossypium / Q000033:anatomy & histology / Q000187:drug effects* / Q000254:growth & development; D007192:Indenes / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects; D008315:Malondialdehyde / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development; D011188:Potassium / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism; D013312:Stress, Physiological / Q000187:drug effects
chemical_list: D000596:Amino Acids; D000975:Antioxidants; D007192:Indenes; D017382:Reactive Oxygen Species; D008315:Malondialdehyde; C058487:coronatine; D011188:Potassium