To investigate the effects of HS on mitochondrial functions under low temperature stress, we analyzed the effects of 0.05 mmol·L NaHS and 15 μmmol·L HT (hypotaurine and HS scavenger) on mitochondria antioxidant enzyme activities and mitochondrial permeability transition pore, mitochondrial membrane fluidity, mitochondrial membrane potential, Cyt c/a ratio and H-ATPase activity in sweet cherry stigma and ovary with sweet cherry variety Zaodaguo under -2 ℃ low temperature stress. The results showed that low temperature stress increased the concentrations of mitochondrial HO and MDA, enhanced the mitochondrial membrane permeability, but decreased the mitochondrial membrane fluidity, membrane potential, Cyt c/a and H-ATPase acti-vity. Application of NaHS at 0.05 mmol·L could effectively reduce the concentrations of HO and MDA, and keep higher activities of SOD, POD and CAT of mitochondrial for longer time. Furthermore, application of 0.05 mmol·L NaHS could decrease mitochondrial membrane permeability while increase mitochondrial membrane fluidity, membrane potential, Cyt c/a and H-ATPase activity in stigma and ovary under low temperature stress. The effects of NaHS were completely offset by HT addition. The results suggested that exogenous HS could alleviate the oxidative damage on stigma and ovary stress through decreasing HO accumulation, regulating mitochondria antioxidant system, increasing H-ATPase activity, and mitigating mitochondria function under low temperature.
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