title: Coronatine enhances drought tolerance via improving antioxidative capacity to maintaining higher photosynthetic performance in soybean.
abstract: Coronatine (COR), a structural and functional mimic of jasmonates, is involved in a wide array of effects on plant development and defence responses. This study was conducted to explore the role of exogenously applied COR in alleviating the adversities of drought stress in soybean. COR treatment markedly increased the activities of antioxidant enzymes and proline content, and reduced the accumulation of malondialdehyde and hydrogen peroxide under drought stress. Thus, COR-treated plants had higher leaf relative water content and lower electrolye leakage, which led to higher chlorophyll content, activities of RuBPCase and PEPCase, and net photosynthetic rate compared to control plants exposed to drought. COR also increased maximal efficiency of PS II photochemical reaction and photochemical quenching coefficient, but decreased non-photochemical quenching coefficient. These beneficial effects led to enhanced photosynthetic performance and the translocation of assimilated (14)C which promoted growth and accumulation of dry biomass in COR-treated soybean plants subjected to drought. Interestingly, COR application did not affect the growth and biomass accumulation under well-watered condition. These results suggested the involvement of COR on improving drought tolerance in soybean by modulating antioxidant systems and membrane stability to maintain higher photosynthetic performance.
authors.affiliation: State Key Laboratory of Plant Physiology and Biochemistry, Department of Agronomy, China Agricultural University, No. 2 Yuanmingyuanxilu, Haidian, Beijing 100193, PR China.
authors.forename: Ling
authors.initials: L
authors.lastname: Hao
authors.forename: Yuqiong
authors.initials: Y
authors.lastname: Wang
authors.forename: Juan
authors.initials: J
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Xie
authors.forename: Mingcai
authors.initials: M
authors.lastname: Zhang
authors.forename: Liusheng
authors.initials: L
authors.lastname: Duan
authors.forename: Zhaohu
authors.initials: Z
authors.lastname: Li
mesh_terms: D000596:Amino Acids / Q000494:pharmacology*; D000975:Antioxidants / Q000378:metabolism; D018533:Biomass; D002250:Carbon Radioisotopes / Q000032:analysis; D002374:Catalase / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D055864:Droughts; D005453:Fluorescence; D006861:Hydrogen Peroxide / Q000378:metabolism; D007192:Indenes / Q000494:pharmacology*; D015227:Lipid Peroxidation; D008315:Malondialdehyde / Q000378:metabolism; D010730:Phosphoenolpyruvate Carboxylase / Q000187:drug effects / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects*; D018515:Plant Leaves / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development / Q000502:physiology; D018526:Plant Transpiration / Q000187:drug effects; D012273:Ribulose-Bisphosphate Carboxylase / Q000187:drug effects / Q000378:metabolism; D013025:Glycine max / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development / Q000502:physiology; D013312:Stress, Physiological / Q000187:drug effects*; D014867:Water / Q000378:metabolism
chemical_list: D000596:Amino Acids; D000975:Antioxidants; D002250:Carbon Radioisotopes; D007192:Indenes; D014867:Water; D002734:Chlorophyll; D008315:Malondialdehyde; C058487:coronatine; D006861:Hydrogen Peroxide; D002374:Catalase; D010730:Phosphoenolpyruvate Carboxylase; D012273:Ribulose-Bisphosphate Carboxylase
keywords: APX; Antioxidant defense; CAT; COR; Ci; Coronatine; Drought; F(v)/F(m); G(s); H(2)O(2); MDA; NPQ; P(n); PEPCase; POD; Photosynthesis; RWC; RuBPCase; SOD; Soybean; Tr; ascorbate peroxidase; catalase; coronatine; hydrogen peroxide; intercellular CO(2); malondialdehyde; maximal efficiency of PS II photochemical reaction; net photosynthetic rate; non-photochemical quenching coefficient; peroxidase activity; phosphoenolpyruvate carboxylase; photochemical quenching coefficient; q(p); relative water content; ribulose-1,5-bisphosphate carboxylase; stomatal conductance; superoxide dismutase; transpiration rate