中文摘要：

研究壳聚糖与纳米Si Ox以及两者复合处理对脐橙果实采后主要侵染性病害青、绿霉病和炭疽病的控制效果,并初步探讨其抗病机制。以脐橙果实为材料,采收后用不同质量浓度壳聚糖与纳米Si Ox溶液浸泡处理1 min,研究壳聚糖与纳米Si Ox处理对果实青、绿霉病和炭疽病自然发病情况的影响;同时,通过不同时间损伤接种病原菌,研究壳聚糖与Si Ox处理对果实青、绿霉病和炭疽病的控制效果。结果显示：1.5 g/100 mL壳聚糖复合0.08 g/100 mL Si Ox处理控制采后脐橙果实青、绿霉病和炭疽病的自然发病效果最好,同时降低了接种病原菌果实的发病率和病斑直径,效果明显优于壳聚糖与Si Ox单独处理。

英文摘要：

The aim of this study was to investigate the effects and mechanism of chitosan, Si Ox and their combination on postharvest disease control of navel orange. After harvest, navel oranges were dipped into different solutions containing either or both of chitosan and Si Ox for 1 min. The influences of chitosan and Si Ox treatments on natural incidence of diseases of navel oranges were detected. Besides, the effects of chitosan and Si Ox treatments on diseases control by changing the order of inoculating pathogens were also investigated. The results showed that 1.5 g/100 mL chitosan combined with 0.08 g/100 mL Si Ox exerted the most significant inhibition on natural diseases incidence, decreased the diseases incidence and reduced the lesion diameter of navel oranges inoculated with pathogens. Compared with either treatment alone, the combined treatment with chitosan and Si Ox was more effective.