不同浓度调环酸钙对黄瓜幼苗徒长防控的影响

以黄瓜品种绿剑为材料,幼苗出土后外源施用不同浓度(100、150、200 mg·L~(-1))的调环酸钙(Pro-Ca),研究调环酸钙对黄瓜穴盘幼苗徒长的防控效果。结果表明,喷施一定浓度调环酸钙可有效抑制下胚轴长和株高,提高G值、根冠比、壮苗指数和根系活力,促进光合作用,显著提高叶片叶绿素含量、净光合速率、蒸腾速率、气孔导度,显著降低胞间二氧化碳浓度,降低幼苗叶片中IAA和GA_3水平,提高ZR的水平。外源施用150 mg·L~(-1)调环酸钙效果最好,可有效调控黄瓜幼苗株型,提高幼苗素质,利于壮苗培育。

Effects of Different Prohexadion-calcium Concentration on Controlling Over Growth of Cucumber Seedlings

Taking cucumber variety ‘Lyujian’as material，this paper studied the effects of Prohexadioncalcium（Pro-Ca）for controlling over growth of plug seedlings by applying different Pro-Ca concentration（100，150，200 mg · L^-1）．The result showed that spraying Pro-Ca of certain concentration could effectively inhibit the hypocotyl length and plant height；improve G value，root-shoot ratio，strong seedling index，root system activity；and promote the photosynthesis，significantly increase chlorophyll content of leaves，net photosynthetic rate，transpiration rate and stomatal conductance，significantly decrease intercellular carbon dioxide concentration，decrease the level of IAA，GA₃ and increase the level of ZR．Applying Pro-Ca of 150 mg · L^-1 could have the best effects，effectively controlling the plant type of cucumber seedlings，improving seedling quality and being beneficial to cultivate strong seedlings．