论文部分内容阅读
[目的]探讨套袋黄冠梨果实褐斑病的发生机制。[方法]于盛花后36 d对黄冠梨果实进行不同套袋处理;于果实成熟期(盛花后130 d)每株各选择一个基部主枝统计褐斑病发病率,并采取未套袋果实、套袋后表现正常、发病初期和发病后期的果实各30个进行果皮和果肉的Ca、Mg、K含量分析。[结果]套2层纸袋的果实中未发生果皮褐斑病,而套3层纸袋的果实中发生褐斑病。套袋降低了黄冠梨果皮中Ca含量和Ca/K比值,提高了K含量,特别是患病果实表现更为明显;但套袋对果肉中Ca、K含量影响较小。套袋均可提高果肉中Mg含量,降低果皮中叶绿素含量,但厚纸袋明显低于薄纸袋,患病果皮中叶绿素含量较低于正常果实。[结论]黄冠梨果皮褐斑病的发生与套厚袋诱导的果皮中低Ca含量和低Ca/K比值有密切关系。
[Objective] The research aimed to discuss the mechanism of fruit brown spot disease in bagged Huangguan pear. [Method] The bagging treatments of Huangguan pear were carried out 36 days after full bloom. The incidence of brown leaf spot was calculated on the basis of the main branch of each plant at the maturity stage (130 days after full bloom) , Bagging normal performance, early onset and late onset of the fruit of 30 pericarp and pulp Ca, Mg, K content analysis. [Result] The brown leaf spot was not found in the fruit of the 2-layer paper bag, but the brown spot was found in the fruit of the 3-layer paper bag. The bagging reduced the content of Ca and Ca / K in the peel of Huangguan pear and increased the content of K, especially in the diseased fruits. However, the effect of bagging on the content of Ca and K in the pulp was little. Bagging can increase the content of Mg in the pulp, reduce the content of chlorophyll in the peel, but the thick paper bag is obviously lower than the thin paper bag, the content of chlorophyll in the diseased peel is lower than the normal fruit. [Conclusion] The occurrence of brown spot in Huangguan pear was closely related to the low Ca content in peel and the low Ca / K ratio induced by thick bag.