甜柿套袋微域生境与果实着色效应研究

对4种不同材质的果袋,进行套袋微域生境及果实着色试验,结果表明,双层内红袋处理昼夜温差较大,9月18—21日和10月上旬晴天条件下,分别比对照高5.8℃和4.8℃;塑膜袋和双层纸袋保湿性较好,在晴热干燥、空气湿度过低时,可减轻相对湿度胁迫;双层纸袋遮光严重,晴天14:00双层内红袋和双层内黑袋袋内光辐射只有对照的0.8%和0.4%。不同套袋材料形成不同的微环境,对柿果着色产生不同的影响,双层内红处理果实着色最好,其次为双层内黑,其他处理与对照差异较小,9月25日调查,双层内红果皮色为N25B,对照为163B;10月15日双层内红为33A,对照为N25B。对甜柿果皮进行色素分析,发现不同处理柿果生长后期类胡萝卜素含量均提高,套纸袋处理降低果皮类胡萝卜素含量;双层纸袋处理后期类黄酮含量增加,其他处理及对照则降低,成熟期双层内红的果皮类胡萝卜素和类黄酮含量分别比对照降低0.017 8 mg·g-1和0.070 6 mg·g-1。

Effects of fruit bags on microenvironment and non-astringent persimmon pigmentation

Effects of fruit bags on microenvironment and non-astringent persimmon pigmentation were studied with four kinds of bags.It was found that temperature difference between day and night inside double-layer bag with red interior layer was greatest among five treatments.Under the condition of sunny days,the temperature increased by 5.8 ℃ and 4.8 ℃on September 18 to 21 and October 3 to 8 respectively,compared with that of the control.The effect of plastic film bag and double-layer bag on the moisture retention was better,which alleviated the relative humidity stress when air humidity was too low under fine,hot and dry weather.The light in double-layer bags was poor,there were only 0.8% and 0.4% PAR inside double-layer bag with red interior layer and double-layer bag with black interior layer rspectively at 14:00 pm on sunny days compared with the control.Different bagging materials formed different micro-environment,which resulted in different effects on fruit coloring.The peel pigmentation was better in the treatment of double-layer bag with red interior layer,followed by double-layer bag with black interior layer.There was less difference between other treatments and control.On September 25,the peel pigmentation was N25B for double-layer bag with red interior layer,and 163B for control.On October 15,the peel pigmentation was 33A for double-layer bag with red interior layer,and N25B for control.It was found that at persimmon late growth stage,carotenoid content increased in all treatments,and paper bags reduced carotenoids in peel In the late growth phase,the treatments reduced the flavonoid content except double-layer paper bags.Double-layer bag with red interior layer reduced Carotenoids and Flavonoids by 0.0178 mg·g-1 and 0.0706 mg·g-1 at maturity compared with control.