以陇椒2号为试材，在昼温28 ℃条件下，应用人工气候箱调控夜温，分别研究了不同夜温(8、12、16、20 ℃)处理对辣椒幼苗叶片光合色素的影响。结果表明，不同夜温下辣椒幼苗叶片叶绿素含量不同，随处理温度的升高，叶绿素总量逐渐增加。处理14 d后，20 ℃夜温下的叶绿素总量明显高于其他处理，分别较8、12、16 ℃夜温处理提高8.9、6.7、5.1 mg/L；20 ℃夜温下，类胡萝卜素含量较高，分别较8、12、16 ℃夜温处理提高1.6、0.4、0.3 mg/L。说明在20 ℃夜温下更有利辣椒幼苗叶片光合色素的增加。

Take Longjiao 2 as the test material， effect of different night temperature (8 ℃， 12 ℃， 16 ℃， 20 ℃) on growth and photosynthetic pigment in pepper seedlings leaves were studied by artificial climate box in daytime temperature of 28 ℃. The results showed that pepper seedlings under different night temperature of different chlorophyll content； with the increase of treatment temperature， total chlorophyll increased gradually. After fourteen days， the night temperature of 20 ℃ have the higher chlorophyll content than 8℃， 12℃， 16℃， and respectively increased 8.9 mg/L， 6.7 mg/L， 5.1 mg/L； meanwile， it have the heighter carotenoids content and respectively increased 1.6 mg/L， 0.4 mg/L， 0.3 mg/L. Therefore，night temperature of 20 ℃ have more favorable photosynthetic pigment in leaves of pepper seedlings increased.

S641.3