为探索弱光胁迫对黄瓜幼果生长发育过程中内源激素含量的影响， 以2个坐果率不同的黄瓜高代自交系R103和Y1203为材料，经弱光胁迫对坐果期黄瓜幼果内源IAA、GA3、ABA、ZT含量及IAA、GA3、ZT 与ABA的比值变化进行研究。结果表明，弱光处理后，2份材料在开花当天IAA、GA3、ABA含量及激素间的比值均低于对照；开花后2、4 d ABA含量均低于对照，GA3 含量R103显著低于对照，Y1203与之相反。IAA含量开花后6 d均显著低于对照，开花后2～6 d ZT含量R103显著低于对照，Y1203则高于对照。GA3 /ABA 和 ZT /ABA比值在开花当天均低于对照，开花后2、4、6 d均较对照显著升高。IAA /ABA比值开花后4 d均高于对照。内源激素含量和比值的这些变化可能是黄瓜在弱光胁迫下幼果对外界环境产生的应激反应。

In order to explore the effects of low light stress on endogenous hormone content during the growth and development of cucumber young fruits， two high-generation cucumber inbred lines R103 and Y1203 with different fruiting rates were used as materials， the contents of endogenous IAA， GA3， ABA， ZT and the ratio of IAA， GA3， ZT to ABA in cucumber young fruit during fruit setting stage were studied under low light stress. The results showed that the contents of IAA， GA3 and ABA and the ratio of hormones were lower than those of the control on the day of flowering after low light treatment. On day 2 and 4 after flowering， ABA content was lower than that of the control， GA3 content of R103 was significantly lower than that of the control， and that of Y1203 was opposite. IAA content was significantly lower than that of the control group 6 days after flowering. The ZT content of R103 was significantly lower than that of the control， and that of Y1203 was higher than that of the control at 2～6 days after flowering. The ratios of GA3/ABA and ZT/ABA were lower than those of the control on the day of flowering， and significantly higher than those of the control on the 2， 4 and 6 days after flowering. The IAA/ABA ratio was higher than that of the control at 4 days after anthesis. These changes of endogenous hormone content and ratio may be the stress response of cucumber young fruit to the external environment under weak light stress.

S435.131.4

国家大宗蔬菜产业技术体系兰州综合试验站(CARS-23-G-19)；甘肃省农业科学院中青年基金“亚逆境 (日光温室)环境下黄瓜幼果内源激素水平与单性结实的相关性研究”(2017GAAS77)。