Aluminum (Al) stress alters nitric oxide (NO) and induces programmed cell death (PCD) in plants. Recent study has shown that NO inhibits Al-induced PCD. However, the mechanism of NO inhibiting Al-induced PCD has not been revealed yet. Here, we investigated the behavior of mitochondria during Al-induced PCD suppressed by NO in peanut. Seedlings of peanut was grown hydroponically in a controllable growth room. The mitochondrial physiological parameters were determined spectrophotometrically. The expression of AhANT and AhHsp70 was determined by quantitative RT-PCR. Al-induced cell death rapidly in peanut root tips is mitochondria-dependent PCD. There was a significantly negative relationship between PCD and mitochondrial NO/HO level. Compared with Al treatment alone, the addition of NO donor sodium nitroprusside (SNP) increased the ratio of NO/HO, down-regulated AhANT expression and inhibited the opening of mitochondrial permeability transition pore (MPTP), up-regulated AhHsp70 expression and increased mitochondrial inner membrane potential (ΔΨm), reduced cytochrome c (Cyt c) release from mitochondria and caspase 3-like protease activity, while the effect of NO specific scavenger cPTIO supplement was opposite. NO suppresses Al-induce PCD in peanut root tips by improving mitochondrial physiological properties.
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