茉莉酸甲酯处理对冷藏雷竹笋内源激素水平及木质素合成相关酶活性的影响

Effects of MeJA Treatment on Endogenous Hormone Level and Enzyme Activity Related to Lignin Synthesis in Bamboo Shoots(Phyllostachys praecox)during Cold Storage

为揭示MeJA处理减轻冷藏雷竹笋木质化败坏的机理,研究了不同浓度茉莉酸甲酯(Methyl jasmonate,MeJA)处理对雷竹笋在冷藏期间内源激素水平及木质素合成相关酶活性的影响。结果表明,10μmol·L-1MeJA处理可有效调控内源激素GA3、ABA和乙烯含量,维持GA3和ABA含量变化的平衡,同时抑制雷竹笋冷藏期间木质素合成相关酶PAL、CAD、4-CL、POD和PPO活性的上升,从而显著抑制冷藏雷竹笋木质素的合成,延缓出汁率的下降和硬度的上升。

The effects of different concentrations MeJA treatments on endogenous hormone level and lignin metabolism related enzyme activity in cold-stored bamboo shoots(Phyllostachys praecox)were investigated in this study to highlight the mechanisms for alleviating flesh leatheriness.The results exhibited that the 10 μmol·L-1 MeJA treatment could effectively regulate the endogenous hormone GA3,ABA and ethylene contents,maintain the balance between the changing GA3 and ABA contents,and at the same time inhibit the activity increase in PAL,CAD,4-CL,POD and PPO.Finally the lignin biosynthesis was remarkably inhibited,the higher extractable juice rate was maintained and the firmness increase in cold-stored bamboo shoots was delayed.