不同时期解袋对东宁5号梨果实着色的影响

Effect of Bag-releasing in Different Stages on the Fruit-coloring of Pear Variety-Dongning No.5

[目的]研究不同时期解袋对东宁5号梨果实着色的影响,为栽培上促进其果实着色提供理论依据。[方法]分别在9月22、26、30日和10月4、6日解袋,以不解袋果实为对照,对套袋东宁5号梨进行不同时期解袋试验。[结果]不同时期解袋均影响果实的着色效果,解袋时间过早,解袋后的果实生长发育时间过长,果实叶绿素重新合成,既增强了底色,又干扰红色的显现;解袋时间过晚,叶绿素含量低,由于外界温度过低、光照不足等导致果实着色不完全,影响果实外观。采收前10～15d解袋,果实上色快,色泽艳丽,果皮中花青素、类胡萝卜素含量最高,叶绿素含量较低,且显著优于其他处理和对照,为东宁5号梨的最佳解袋时期。[结论]采收前10～15d为东宁5号梨的最佳解袋时期。

[ Objective ] The theoretical basis of the promotion of fruit-coloring of pear variety-Dongning No. 5 was provided through the research on the effect of the bag-releasing in the different stages in cultivation practice. [ Method] The experiment in the effect of the date （Sept. 22, Sept. 26, Sept. 30, Oct. 4, Oct. 6, and non bag-releasing as the control） of bag-releasing on fruit-coloring of pear variety-Dongning No. 5 was conducted. [ Results] The fruit-coloring of pear variety-Dongning No. 5 was affected by the date of bag-releasing. The red color of fruit could be interfered because the chlorophyll might be re-synthesized resulting in the apparent of background color if the date of the .bag-releasing was too early with too long time of its growth and development. The appearance of fruit could be affected because the fruit-coloring might not be fully completed if the date of bag-releasing was too late resulting in lowest content of chlorophyll under the condition of low temperature and insufficient light outside. The fruit-coloring was fast with gorgeous color, and the content of pericarp anthocyanins and carotenoid in the fruit was highest and the content of chlorophyll was low if the date of bag-releasing was in the 10th - 15th day before its harvesting, which was significantly better than the other treatments and CK, respectively. [ Conclusionl The best date of bag-releasing of pear variety - No. 5 was in the 10 th - 15 th day before its harvesting.