硅酸钠处理对杏果实活性氧和苯丙烷代谢的影响

Effects of sodium silicate dipping on reactive oxygen species metabolism and phenylpropanoid pathway in apricot fruit

摘要: 本实验以李杏为材料,研究了采后50mmol/L硅酸钠溶液浸泡处理对果实活性氧代谢和苯丙烷代谢的影响。结果表明:50mmol/L硅酸钠溶液浸泡处理提高了果实中O-2·的产生速率和H2O2含量,提高了超氧化物歧化酶（SOD）活性,抑制了过氧化氢酶（CAT）的活性。另外,处理还提高了果实苯丙氨酸解氨酶（PAL）活性,诱导果实中的抗性物质总酚和木质素的积累。因此,硅酸钠处理可通过调节活性氧代谢和苯丙烷代谢途径来增加对杏果实对病害的抗性。

Abstract: Apricot ( Prunus simonii Carr) fruit were used as materials, which were treated with 50mmol /L sodium silicate to investigate its effect on reactive oxygen species and phenylpropanoid pathway in fruit. The results indicated that sodium silicate significantly promoted the production rate of superoxide anion ( O-2·) and the accumulation of hydrogen peroxide ( H2O2) , increased the activity of superoxide dismutase ( SOD) , and inhibited the activity of catalase ( CAT) . Moreover, sodium silicate increased the activity of phenylalanine ammonia- lyase ( PAL) , enhanced the accumulation of total phenolic compounds and lignin in fruit.These results suggested that postharvest sodium silicate treatment could increase the resistance in apricot fruit against postharvest disease by activating reactive oxygen species metabolism and activation of phenylpropanoid pathway.