过氧化氢在香蕉果实采后耐冷性诱导中的作用  

Role of Hydrogen Peroxide on Chilling Resistance of Postharvest Banana Fruits

作　　者：庞学群[1] 潘少丽[1] 王海波[1] 黄椿颖[1] 张昭其[1] 

机构地区：[1]华南农业大学园艺学院

出　　处：《园艺学报》2007年第6期1373-1378,共6页Acta Horticulturae Sinica

基　　金：国家自然科学基金项目(30471219);广东联合基金重点项目(U0631004);广东省自然科学基金团队项目(06200670)

摘　　要：采用外源过氧化氢(H2O2)、可诱导植物产生内源H2O2的茉莉酸甲酯(MJ)和水杨酸(SA)处理香蕉果实,探讨H2O2在香蕉果实采后耐冷诱导中的作用。结果表明:在7℃下贮藏,外源20mmol·L-1H2O2、0.7mmol·L-1SA、0.1mmol·L-1MJ处理能使果实冷害症状推迟2～5d出现;延缓了香蕉果皮细胞膜透性和MDA含量的增加,提高了超氧化物歧化酶(SOD)和过氧化物酶(POD)活性,抑制了过氧化氢酶(CAT)活性,从而使果皮中H2O2积累。推测H2O2可能作为信号分子参与诱导了香蕉果实采后的抗冷性。Exogenous hydrogen peroxide, and salicylic acid and methyl jasmonate, which induced the accumulation of endogenous hydrogen peroxide in plants, were used to investigate the role of hydrogen peroxide on induction of chilling resistance of postharvest banana fruits. The results indicated that 20 mmol · L^-1 hydrogen peroxide, 0. 7 mmol · L^-1 salicylic acid and 0. 1 mmol · L^-1 methyl jasmonate treatments delayed the occurrence of c injury symptom of banana fruits by 2 -5 d at 7℃. The treatments also delayed the increase of membrane permeability and MDA contents, induced the activities of SOD and POD, inhibited the activities of CAT, and therefore resulted in accumulation of endogenous hydrogen peroxide in pericarp of banana fruits. The results implied that salicylic acid and methyl jasmonate might induce the accumulation of endogenous hydrogen peroxide by inhibition of CAT activity, and hydrogen peroxide might involve in induction of the chilling resistance of postharvest banana fruits by acting as the signal molecule.

关 键 词：香蕉 过氧化氢 水杨酸 茉莉酸甲酯 冷害 耐冷性 

分 类 号：S668.1[农业科学—果树学]