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油料植物红皮糙果茶与油茶叶片光合特性研究
李庭海,李乐兴,刘晓,黎科,张永夏
0
(深圳大学生命科学学院,深圳市微生物基因工程重点实验室,深圳 518060)
摘要:
为探明油料植物红皮糙果茶(Camellia crapnelliana Tutcher)光合作用日变化体征,为其科学栽培提供理论依据, 采用Licor-6400便携式光合作用测定仪测定红皮糙果茶和油茶(Camellia oleifera L.)的光合生理特性及环境因子的日变化,并进行分析研究。结果表明,在晴天条件下红皮糙果茶净光合速率曲线呈双峰状,自9:10至13:10期间有一个长达4 h的高效光合平台期(19.7~20.2 μmol·m-2·s-1),最大值为20.2 μmol·m-2·s-1。气孔导度日变化与油茶相似呈单峰曲线于13:10达到峰值0.22 mmol·m-2·s-1,但其蒸腾速率整体高于油茶。油茶无明显光合“午休”现象,净光合速率最大值出现在中午11:10,为20.1 μmol·m-2·s-1。相比之下红皮糙果茶光合作用时间较长,总光合产率较高。
关键词:  红皮糙果茶  油茶  净光合速率  日变化  气孔导度  蒸腾速率
DOI:10.13610/j.cnki.1672-352x.20141029.007
投稿时间:2014-01-23
基金项目:广东省科技计划(2012B020302004)和广东省省部产学研结合项目(2011B090400380)专项基金共同资助。
Photosynthetic characteristics of Camellia crapnelliana Tutcher and Camellia oleifera L.
LI Tinghai,LI Lexing,LIU Xiao,LI Ke,ZHANG Yongxia
(Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Science, Shenzhen University, Shenzhen 518060)
Abstract:
Diurnal changes of the photosynthetic characteristics of Camellia crapnelliana and Camellia oleifera and the environmental factors were determined using Li-6400 portable photosynthetic system. The results showed that C. crapnelliana had a bimodal curve of the diurnal change in the net photosynthetic rate with a peak of 20.2 μmol·m-2·s-1 and a highly efficient photosynthesis occurred during 9:10 and 13:10(19.7-20.2 μmol·m-2·s-1). The diurnal changes of the stomatal conductance in C. crapnelliana were similar to C. oleifera, showing a “single peak curve” modal without a significant midday depression phenomenon with a peak of 0.22 mmol·m-2·s-1 at 13:10. The transpiration rate of C. crapnelliana was generally higher than that of C. oleifera. C. oleifera showed no an obvious photosynthetic depression and the maximal net photosynthetic rate was 20.1 μmol·m-2·s-1 at 11:10. The results suggested that C. crapnelliana may have a longer daily photosynthesis time and a higher photosynthetic efficiency than C. oleifera.
Key words:  C. crapnelliana  C. oleifera  net photosynthetic rate  diurnal change  stomatal conductance  transpiration rate

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