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通过盆栽试验,研究了外源茉莉酸甲酯(MeJA)处理对低温、干旱和极端高温胁迫下蝴蝶兰幼苗叶绿素荧光参数和抗氧化指标的影响。结果表明,较高浓度的MeJA(150和200μmol·L-1)提高了非生物胁迫下蝴蝶兰幼苗叶片最大光化学效率(Fv/Fm)和实际光化学效率(ΦPSII),降低了叶片相对电导率,还使得超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)活性升高,丙二醛(MDA)含量降低。表明MeJA作为一种生物调节剂,一定浓度的处理对蝴蝶兰幼苗抗逆性的提高具有明显效果。
Pot experiments were conducted to study the effects of exogenous MeJA treatment on the chlorophyll fluorescence parameters and antioxidant enzymes of Phalaenopsis scabra seedlings under cold, drought and extreme high temperature stress. The results showed that higher concentrations of MeJA (150 and 200μmol·L-1) increased the maximum photochemical efficiency (Fv / Fm) and actual photochemical efficiency (ΦPSII) of Phalaenopsis seedling leaves under abiotic stress, decreased the relative conductivity of leaves, The activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) were also increased and the content of malondialdehyde (MDA) was decreased. The results showed that MeJA, as a biomodulator, had a significant effect on the improvement of stress resistance of Phalaenopsis scoparium seedlings.