中国林学（英文版）2004，Vol.6Issue(4)：8-12,5.
Effects of Osmoconditioning on Mitochondrial Respiration and Phosphorylation in Soybean Seeds
Effects of Osmoconditioning on Mitochondrial Respiration and Phosphorylation in Soybean Seeds
摘要
Abstract
Cotyledon mitochondrion respiration and oxidative phosphorylation activity were studied in two groups of soybean seeds. One group was primed with polyethylene glycol (PEG) for different periods of time, and the other was unprimed (control), and both were then exposed to imbibition at low temperatures before their germination. The results indicated that when L-Malate (L-Mal) and α-Ketoglutarate (α-Kg) were used as substrates, the ADP-stimulated mitochondria respiration rates of control seeds were markedly higher than state Ⅲ respiration rates of primed seeds. However, the osmoconditioning pretreatment significantly enhanced the oxidative phosphorylation activity of cotyledon mitochondrion in 12 h. The oxidative phosphorylation activity of the mitochondrion of primed seeds was normal and the ADP/O value was consistent with the theoretical one. When reduced nicotinamide adenine dinucleotide (NADH) was used as the substrate, the mitochondria of control seeds still had oxidative phosphorylation activity, while ADP/O value was obviously lower than that of mitochondria of primed seeds. When Succinate (Succ) was used as the substrate, the oxidative phosphorylation activity of the primed seeds was normal after priming for 24 h. When different substrates were used, the emerging order of the oxidative phosphorylation activity of the primed seeds was NADH, α-Kg, Succ and in the last place L-Mal. The mechanism of soybean imbibitionl chilling injury and protective effect of PEG priming were discussed.关键词
soybean seed/priming/respiration/oxidative phosphorylationKey words
soybean seed/priming/respiration/oxidative phosphorylation引用本文复制引用
Zhang Ming,Wang Xiaofeng..Effects of Osmoconditioning on Mitochondrial Respiration and Phosphorylation in Soybean Seeds[J].中国林学（英文版）,2004,6(4):8-12,5.基金项目
Supported by the National Natural Science Foundation of China (Grant No.30170100) （Grant No.30170100）
