Abstract: Seasonal variations of chlorophyll, the activities of glycolate oxidase (GO) and RuBPC carboxylase (RuBPCase) in Chorisia speciosa leaves were studied.The results were as follows.The concentrations of Chla、Chlb and Chl (a+b) changed from May to December, and reached their high peak on July;Seasonal variation in the activity of RuBPcase was a bimodal curve and had two peaks in June and September, the peaks were about 275 nmol/mg·min and 248 nmol/mg·min, respectively, and there was a low valley in August;Seasonal variation in the activity of GO was different to RuBPcase, its peak came in August and reached about 252 nmol/mg·min.Seasonal variations of PAR and Tair were important to chlorophyll and the activity of GO, and had a significantly relationship with them.

Key words: Chorisia speciosa, chlorophyll, glycolate oxidase, RuBPCase, seasonal variation

摘要： 对美丽异木棉叶片叶绿素含量与乙醇酸氧化酶(GO)、核酮糖二磷酸羧化酶(RuBPCase)活性的季节变化进行测定。结果表明:叶片Chla、Chlb和Chl (a+b)含量的峰值均出现在7月;叶片GO活性季节变化为单峰型曲线,8月最高(252 nmol/mg·min);RuBPCase活性季节变化为双峰曲线,6月和9月各有一峰值,分别为275 nmol/mg·min和248 nmol/mg·min,8月出现低谷;叶绿素含量和酶活性受光合有效辐射(PAR)与气温(Tair)的影响较大。

关键词: 美丽异木棉, 叶绿素, 乙醇酸氧化酶, 核酮糖二磷酸羧化酶, 季节变化