夜间不同LED补光时段对番茄幼苗生长生理指标的影响

LED lighting periods at night affects the growth and development of tomato seedlings

设施番茄在育苗过程中生长常会受到弱光、低温等环境的制约,可利用人工补光手段,改善设施光环境,培育出更加健壮的幼苗。以番茄品种Money Maker为材料,采用夜间LED补光,探究夜间4个不同补光时段对番茄幼苗生长发育的影响。结果表明,夜间LED补光对番茄幼苗生长发育有一定的影响,其中,T3(白天正常照射4.5 h后进行3 h暗期补光)处理相比对照,能显著提高番茄幼苗株高、茎粗、叶片数、壮苗指数、根系活力、净光合速率、保护酶活性以及叶片中叶绿素、可溶性蛋白质、可溶性糖和脯氨酸含量;而T2(白天正常照射结束后每隔3 h补光1 h)处理则在提高番茄幼苗株高、CAT活性方面效果最显著,但与T3差异不显著。此外,T3处理番茄幼苗叶片中的MDA含量也是最低,显著低于T4处理和对照。综上所述,T3处理是对设施番茄幼苗的生长发育最为有利的夜间补光时间段,最能提高植物光合能力,有利于物质的积累和培育健壮的幼苗。

The growth of protected tomato is often restricted by weak light and low temperature.Artificial light supplement can be used to improve the facility light environment and cultivate stronger seedlings.In this experiment,the tomato variety Money Maker was used to explore the effects of four different light supplement periods at night on the growth and development of tomato seedlings.The results showed LED light supplement at night had a certain effect on the growth and development of tomato seedlings.Compared with the control,T3(light supplementation in 3 h dark period after 4.5 h of normal light in the daytime)treatment could significantly improve the plant height,stem diameter,leaf number,strong seedling index,root activity,net photosynthetic rate,protective enzyme activity and the contents of chlorophyll,soluble protein,soluble sugar and proline in leaves;T2(fill in light for 1 hour every 3 hours after normal irradiation in the daytime)had the most significant effect on increasing the plant height,and CAT activity of tomato seedlings,but there was no significant difference with T3;In addition,the MDA content in tomato seedling leaves of T3 treatment was also the lowest,which was significantly lower than that of T4 treatment and control.According to the comprehensive indicators,T3 treatment is the most favorable night light supplement period for the growth and development of protected tomato seedlings,which can best improve the photosynthetic capacity of plants,facilitate the accumulation of matter and cultivate more stronger seedlings.