摘要
以‘台农 1 号’杧果(Mangifera indica L.‘Tainong 1’)为试材,研究了采前喷施茉莉酸甲酯(MeJA)处理对杧果抗病性和采后品质的影响及其相关机理。结果表明,与对照果实相比,50 μmol · L-1MeJA 采前处理显著降低了采收时的病果率和贮藏期的病情指数,抑制了接种炭疽病菌果实的病斑直径;有利于杧果贮藏品质的保持,提高了果肉中维生素 C 含量,延缓了可溶性糖含量的升高和可滴定酸含量的降低;同时,采前 MeJA 处理可以提高杧果果皮中苯丙氨酸解氨酶(PAL)、过氧化物酶(POD)、多酚氧化酶(PPO)和β–1,3–葡聚糖酶(GLU)等防御酶的活性,提高贮藏早期的过氧化氢(H2O2)水平,抑制贮藏后期 H2O2和 MDA 含量的积累。这些结果表明,采前 MeJA 处理提高杧果抗病性和保持果实品质与激活杧果的防御系统及降低膜脂过氧化程度有关。
The effects of pretharvest methyl jasmonate（MeJA）spraying on disease resistance and postharvest quality of mango（Mangifera indica L.‘Tainong 1’）fruits as well as the related mechanism were investigated. The results indicated that,compared with the control fruits,50 μmol · L-1 MeJA treatment significantly reduced the disease incidence of mango fruits at harvest,the disease index of non-inoculated mango fruits and the lesion diameter of mango fruits inoculated with C. gloeosporioides during storage. Moreover,preharvest MeJA treatment was effective in maintaining fruit qualities,as it increased vitamin C content,delayed the increase of soluble sugar and decrease of titrable acidity in mango fruit pulp during storage. Meanwhile,preharvest application of MeJA enhanced the activities of defense enzymes phenylalanine ammonia-lyase（PAL）,peroxidase（POD）,polyphenol oxidase（PPO）and β-1,3-glucanase（GLU）in the fruits during storage. In addition,the level of hydrogen peroxide（H2O2）was activated by the MeJA treatment during the early stage of storage. However,the contents of H2O2 and malondialdehyde（MDA）in the fruit were inhibited during the late stage of storage. These results indicated that the effects of pretharvest MeJA treatment on inducing disease-resistance and maintaining postharvest quality of mango fruits may involve the activation of the disease-related defense system and reduced membrane-lipid peroxidation.
出处
《园艺学报》
CAS
CSCD
北大核心
2013年第1期49-57,共9页
Acta Horticulturae Sinica
基金
海南省自然科学基金项目(310100)
中央级公益性科研院所基本科研业务费专项项目(1251022012001)
‘十一五’科技支撑计划重点项目(2006BAD22B06)
关键词
杧果
茉莉酸甲酯(MeJA)
采后
品质
防御酶
炭疽病
抗病性
mango, methyl jasmonate, postharvest, quality, defense enzymes, anthracnose, disease resistance
