水杨酸与硝普钠对采后芒果果实炭疽病抗性和苯丙烷代谢的协同诱导效应

为了明确水杨酸(salicylic acid,SA)和一氧化氮(nitric oxide,NO)在采后芒果炭疽病抗性诱导中的协同作用,以'台农'芒果(Mangifera indica L.)为材料,分析了2 mmol/L SA和0.25 mmol/LNO供体硝普钠(sodium nitroprusside,SNP)单独...

Synergistic Effect of Combined Salicylic Acid and Nitric Oxide in Anthracnose Resistance and Phenylpropanoid Metabolism in Mango Fruit

To clarify the synergistic effect between salicylic acid (SA) and nitric oxide (NO) in inducing resistance against anthracnose in postharvest mango fruit, the effects of single and combined treatment with 2 mmol/L SA and 0.25 mmol/L sodium nitroprusside (SNP, a NO donor) were investigated on the disease incidence, lesion diameter, and disease resistance-related enzyme activities as well as substance contents in ‘Tainong’ mango fruit (Mangifera indica L.) inoculated with Colletotichum. gloeosporioides. The results showed that SA, SNP and their combination significantly reduced the growth of C. gloeosporioides, decreased malondialdehyde (MDA) accumulation, and slowed down the progression of anthracnose. In addition, the activities of resistance-associated enzymes, such as phenylalanine ammonia lyase (PAL), cinnamyl alcohol dehydrogenase (CAD), cinnamate-4-hydroxylase (C4H), 4-coumarate coenzyme A ligase (4CL), polyphenol oxidase (PPO), peroxidase (POD), chitinase (CHI) and β-1,3-glucanase (GLU) were increased markedly, and the accumulation of lignin, total phenols and flavonoids was elevated. The combination of SA and SNP was more effective than either alone. The above results show that exogenous SA and SNP combination synergistically protects mango fruit from fungal infection and improves fruit resistance to postharvest diseases, which can provide useful information for reducing the disease caused by invasion of C. gloeosporioides and preserving postharvest mango fruit.