不同光质对温室甜椒气孔导度的影响

Effect of Light Quality on Stomatal Conductance of Sweet Pepper in Greenhouse

以甜椒品种‘苏椒13号’和‘川雄9号’为试材,于2009年3～8月在江苏南京设计不同彩色塑料薄膜(红、绿、黄、紫、蓝,无色膜为对照(CK))覆盖处理试验,系统研究不同光质对温室甜椒气孔导度的影响。结果表明:(1)在幼苗期2品种气孔导度日变化曲线的峰值均以对照(CK)最高,‘苏椒13号’和‘川雄9号’分别以紫膜和红膜处理最低,所有光质处理的气孔导度的日变化曲线均为单峰型;在结果期‘苏椒13号’的气孔导度峰值以红膜处理最高,黄膜处理最低;研究发现红膜、蓝膜和黄膜处理有效诱导温室甜椒叶片气孔开放,而紫膜和绿膜处理抑制气孔开放;(2)2甜椒品种的蒸腾速率在幼苗期和结果期分别均以对照和红膜处理最高,绿膜处理最低;(3)试验期间温度对甜椒叶片气孔导度影响不显著,而叶片气孔导度随光合有效辐射增强而增加。

The stomatal conductance of two sweet pepper varieties‘Sujiao13’and‘CX-9’planted in a greenhouse with red,yellow, green,blue,purple and clear plastic film covering on six different part of it were measured in this experiment to study the effect of light quality on stomatal conductance of sweet pepper. The results showed that： （ 1） In seedling stage,the diurnal change of stomatal conductance with all treatments presented single peak curves with the daily maximum stomatal conductance with the clear plastic film treatment higher than that with other treatments,and the daily minimum stomatal conductance were found to be lowest with purple plastic film treatment for Sujiao13 and with red plastic film treatment for CX-9. While in fruit setting stage,the peak value of diurnal change curve of stomatal conductance was highest with red plastic film treatment and lowest with yellow plastic film treatment for Sujiao13. It was found that the red,blue and yellow plastic film treatment could induce the opening of stomatal of greenhouse sweet pepper,while the effects were opposite for purple and green plastic film treatment. （ 2） The transpiration rates of the two varieties were highest with clear plastic film treatment and red plastic film treatment,respectively,in seedling stage and fruit setting stage. With green plastic film treatment,the transpiration rates of the two varieties were lowest in both development stages. （ 3） The effect of temperature on the stomatal conductance of sweet pepper was not significant during the experiment,however,the stomatal conductance of sweet pepper rose with the increasing of photosynthetically active radiation.