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CROP PHYSIOLOGY & METABOLISM

Chilling Tolerance of Wheat Seedlings Is Related to an Enhanced Alternative Respiratory Pathway

^a MOE Key Laboratory of Arid and Grassland Ecology, School of Life Sciences, Lanzhou Univ., Lanzhou, 730000, China
^b College of Life Science, Northwest Normal Univ., Lanzhou, 730070, China

^* Corresponding author (lihy{at}lzu.edu.cn).

Pretreatment with exogenous hydrogen peroxide (H₂O₂) mitigated the water loss of wheat leaves exposed to 4°C for 24 h. The same treatment also partially reduced the increases of electrolyte leakage and H₂O₂ production of the chilled plants. These observations suggest that H₂O₂ pretreatment could effectively induce chilling tolerance. The capacity of the alternative respiratory pathway and the expression of the gene encoding the alternative oxidase (AOX1) were substantially elevated by H₂O₂ treatment under either normal or chilling conditions. Salicylhydroxamic acid (SHAM, an inhibitor of the alternative respiratory pathway) decreased the tolerance of plants to chilling conditions and reversed the chilling tolerance induced by exogenous application of H₂O_2. These observations indicate that the tolerance of plants to chilling might be related to an enhanced alternative respiratory pathway.

Abbreviations: ABA, abscisic acid • AOX, alternative oxidase • AP, alternative respiratory pathway • CAT, catalase • DW, dry weight • FW, fresh weight • HO·, hydroxyl radical • H₂O₂, hydrogen peroxide • O₂^.–, superoxide radical • POX, peroxidase • ROS, reactive oxygen species • RWC, relative water content • SHAM, salicylhydroxamic acid • SOD • superoxide dismutase • TW, turgid fresh weight • V_alt, the capacity of alternative respiratory pathway • V_cyt, capacity of cytochrome respiration pathway