己醛熏蒸对脐橙果实侵染性病害和生理性病害的影响

Effect of Hexanal Fumigation on Infectious Diseases and Physiological Disorders of Navel Orange

以脐橙为原料,研究了不同剂量的己醛熏蒸对采后脐橙果实常见侵染性病害和生理性病害的影响。果实损伤接种的实验结果表明,与对照组相比,先己醛熏蒸后接种病原菌对脐橙果实采后侵染性病害的控病效果不显著;而先接种病原菌后己醛熏蒸对侵染性病害的控制效果与己醛剂量有关。50、100μL/L己醛熏蒸能显著降低果实青霉病、绿霉病、炭疽病的发病率和病斑直径,其中100μL/L的己醛效果最好。同时100μL/L的己醛也可以显著抑制脐橙果实自然发病率的上升。果实生理性病害的研究表明,低剂量(50、100μL/L)己醛熏蒸与对照相比差异不显著,而高剂量(150μL/L)的己醛熏蒸会促进酚类物质的氧化,造成果皮的褐变和塌陷,加重果实生理性病害的发生。

We designed this study to examine the effect of hexanal fumigation on postharvest infectious diseases and physiological disorders of navel oranges. For infectious diseases, the effect of hexanal vapour treatment before artificial inoculation of navel oranges with Penicillium italicum, Penicillium digitatum and Colletotrichum gloeosporides was not significant whiIe the effect of hexanal vapour treatment after artificial inoculation with pathogens was related to its concentration. The incidence of infectious diseases was decreased by hexanal vapour treatment at 50 and 100 IxL/L, especially at 100 μL/L. Meanwhile, 100 μL/L hexanal vapour also significantly inhibited the increase in the natural incidence of diseases. The effect of hexanal vapor treatment at low concentrations （50 and 100 μL/L） on physiological disorders was not significant, but hexanal vapor treatment at high concentration （150 μL/L） promoted the oxidation of total phenolics, caused rind collapse and then accelerated the occurrence of the physiological disorders.