LED光质对番茄幼苗生长及内源性GA和IAA含量的影响

摘要

采用发光二极管调制光谱能量分布,以荧光灯为对照,研究不同光质(红光、蓝光、黄光、绿光)下番茄幼苗生理特性及内源性GA和IAA水平与其生长的关系.结果表明:(1)红光和蓝光有利于番茄幼苗茎的伸长和叶面积的增加.(2)除蓝光处理下可溶性糖含量和SOD活性与对照无显著性差异外,各单色光质处理下番茄幼苗根系活力、色素含量、可溶性蛋白和可溶性糖含量、SOD活性较对照均显著降低.(3)与对照相比,各单色光质处理下番茄幼苗叶片中GA含量显著降低,IAA含量在红光下显著升高,在黄光和绿光下显著降低,且叶面积与IAA含量呈显著正相关关系.(4)番茄幼苗茎中GA和IAA含量在红光和蓝光处理下显著高于对照和黄、绿光处理,且株高与茎中GA和IAA含量呈正相关关系.%In order to study the physiological characters and the correlation between endogenous GA,IAA and growth of tomato seedling,we used light-emitting diode (LED) as light source and with fluorescent light as control.Four different monochromatic light(red light,blue light,yellow light and green light) were set as experimental treatments.The results showed that:(1) Seedlings under red light and blue light had longer stem and larger leaf area.(2)Except from the soluble sugar content and the activity of SOD of seedling under blue light,the root activity,pigment content,soluble sugar and soluble protein content of seedling under other monochromatic light treatments were all lower than the control treatment.(3)Compared with the control treatment,the GA level of seedling leaf in other treatments reduced dramatically.The IAA level of leaf under red light increased dramatically and reduced significantly under yellow light and green light.Positive correlation existed between IAA level of leaf and leaf area.(4)The GA and IAA level were both significantly higher under red light and blue light than that of the control,yellow light and green light.Positive correlation existed between IAA level of stem and stem length,also between GA level of stem and stem length.