[Effects of drought stress on cyanide-resistant respiration and metabolism of reactive oxygen in wheat seedling].
The changes in cyanide-resistant respiration and metabolism of active oxygen species in drought-sensitive and drought-resistant wheat seedlings under water stress were studied. In general, drought stress decreased the level of cyanide-resistant respiration and AOX1 mRNA content in wheat seedling leaves. But the drought-resistant cultivars, which had much higher level of cyanide-resistant respiration and AOX1 mRNA content than the drought-sensitive ones, presented an ability to adapt to mild drought stress. Under drought stress, the drought-sensitive wheat seedling leaves had higher O(-.)(2) and H(2)O(2) contents, but lower SOD, POX and CAT activities than drought-resistant cultivars. We guessed that severe drought stress could break down the balance between active oxygen species and cyanide-resistant respiration. However, cyanide-resistant respiration still could participate in the drought-resistance by lowering the level of active oxygen species besides by other mechanism.
Wu
Qiang
Q
School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
Feng
Han-Qing
HQ
Li
Hong-Yu
HY
Wan
Dong-Shi
DS
Liang
Hou-Guo
HG
D015152:Blotting, Northern; D002374:Catalase / Q000378:metabolism; D019069:Cell Respiration / Q000187:drug effects*; D003486:Cyanides / Q000494:pharmacology*; D055864:Droughts; D004351:Drug Resistance; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000378:metabolism; D024101:Mitochondrial Proteins; D010087:Oxides / Q000378:metabolism; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism; D009195:Peroxidase / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism; D014908:Triticum / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D000099188:Alternative Oxidase
D002374:Catalase; D003486:Cyanides; D006861:Hydrogen Peroxide; D024101:Mitochondrial Proteins; D010087:Oxides; D010088:Oxidoreductases; D009195:Peroxidase; D010940:Plant Proteins; D017382:Reactive Oxygen Species; D013482:Superoxide Dismutase; D000099188:Alternative Oxidase