Abstract Superficial scald, which appears as black or brown necrotic patches on the skin, is a serious postharvest physiological disorder of pear fruit. The occurrence of scald in ‘Chili’ pear (Pyrus bretschneideri) fruit during storage at 2 °C in response to preharvest polyethylene (PE) bagging and non-woven fabric bagging has been investigated. The non-woven fabric bagging treatment of fruit prevented scald development, while the PE bagged fruit had a higher incidence of scald than the untreated fruit. Fruit from the PE bagging treatment had lower Ca content, less distribution and lower flux rate of Ca2+ than no bagging and non-woven fabric bagging fruit. The treatment also was associated with greater expression of genes encoding calmodulin-like (CML) proteins, such as PbCML19, PbCML5, PbCML38, PbCML42-1, and PbCML42-2. In contrast, non-woven fabric bagging did not affect the expression of these genes in the fruit. In addition, CaCl2 treatment reduced scald development in PE bagged pear fruit during storage. Our results suggest that Ca2+ may play a role in regulating the occurrence of superficial scald in pear fruit.

中文翻译：

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采前装袋和采后钙处理影响“辣椒”梨（Pyrus bretschneideri）果实贮藏期间的表面烫伤发生率和钙营养

摘要 浅烫伤是梨果实采后严重的生理病害，表现为表皮上出现黑色或褐色的坏死斑块。已经研究了“辣椒”梨（Pyrus bretschneideri）果实在 2 °C 下储存期间因采收前聚乙烯 (PE) 袋装和无纺布袋装而发生烫伤的情况。水果的无纺布袋装处理防止了烫伤的发展，而PE袋装水果的烫伤发生率高于未处理的水果。与不套袋和无纺布套袋水果相比，PE套袋处理的果实Ca含量低，Ca2+分布少，Ca2+通量率低。治疗还与编码钙调蛋白样 (CML) 蛋白的基因表达增加有关，例如 PbCML19、PbCML5、PbCML38、PbCML42-1 和 PbCML42-2。相比之下，无纺布套袋不影响这些基因在果实中的表达。此外，CaCl2 处理减少了 PE 袋装梨果实在储存过程中的烫伤发展。我们的研究结果表明，Ca2+ 可能在调节梨果实表面烫伤的发生中发挥作用。