1-甲基环丙烯结合水杨酸处理维持百香果甲基环丙烯结合水杨酸处理维持百香果果实贮藏品质

1-Methylpropylene Combined with Salicylic Acid Treatment Maintains the Storage Quality of Passion Fruit

为延长百香果的贮藏期并保持贮藏过程中的品质,对比研究2 mmol/L水杨酸(salicylic acid,SA)、1 mmol/L 1-甲基环丙烯(1-methylcyclopropene,1-MCP)、1-MCP结合SA处理对紫色百香果果实采后贮藏期间品质、活性氧、抗氧化酶指标的影响。百香果果实经SA、1-MCP和1-MCP结合SA处理后,一定程度抑制乙烯的释放和脂氧合酶(li-poxygenase,LOX)活性,促进几丁质酶(chitinase,CHI)和β-1,3-葡聚糖酶(β-1,3-glucanase,GLU)的活性,增强抗氧化和抗病性作用,降低腐烂率。但因SA可以增强呼吸,故导致凹陷和失重,加快总酸流失;1-MCP抑制呼吸作用,增强超氧化物歧化酶(superoxide dismutase,SOD)活性,有利于控制失重和凹陷,但其对过氧化物酶(peroxidase,POD)活性的影响不利于控制衰老。1-MCP结合SA对POD活性,CHI活性以及GLU活性的正向影响强于单独使用1-MCP或SA处理。因此,1-MCP结合SA通过提高百香果果实的抗氧化能力和抗病能力,降低百香果果实的凹陷、失重和腐烂率,且可有效避免单独使用1-MCP或SA处理的不良作用,协同维持百香果果实采后贮藏品质。

In order to prolong the storage period and maintain the quality of passion fruit during storage,the ef-fects of 2 mmol/L salicylic acid(SA),1 mmol/L 1-methylcyclopropene(1-MCP),and 1-MCP combined with SA on the quality,reactive oxygen species and antioxidant enzymes of purple passion fruit during postharvest stor-age were compared and studied.After treated with 1-MCP,SA and 1-MCP combined with SA,passion fruit inhib-ited the release of ethylene and the lipoxygenase(LOX)activity to a certain extent,and promoted the activity of chitinase(CHI)andβ-1,3-glucanase(GLU).The antioxidant capacity and disease resistance were enhanced,and the rotting rate was decreased.However,SA could enhanced the respiration of passion fruit,which led to shrinkage and weight loss,and accelerated the total acid loss.1-MCP inhibits respiration,enhances superoxide dismutase(SOD)activity,which is conducive to controlling weight loss and shrinkage,but its effect on peroxi-dase(POD)activity is not conducive to controlling aging.1-MCP combined with SA had a stronger positive ef-fect on POD activity,CHI activity as well as GLU activity than that observed with 1-MCP or SA alone.There-fore,1-MCP combined with SA reduced the shrinkage,weight loss and decay rate of passion fruit by improving the antioxidant capacity and disease resistance of passion fruit,and could effectively avoid the adverse effects of 1-MCP or SA treatment alone,synergistically maintaining the postharvest storage quality of passion fruit.