三个红叶石楠品种光合特性的比较研究  

Study on Photosynthetic Characteristics of Three Cultivars in Photinia×fraseri

作　　者：郭丽[1,2] 刘坤[1] 张栋[1] 周守标[1] 

机构地区：[1]安徽师范大学生命科学学院,安徽重要生物资源保护与利用研究重点实验室,安徽芜湖241000 [2]芜湖职业技术学院,安徽芜湖241000

出　　处：《安徽师范大学学报（自然科学版）》2010年第4期371-374,共4页Journal of Anhui Normal University(Natural Science)

基　　金：安徽省高校生物环境和生态安全重点实验室(2004sys003)专项基金资助;安徽省高校自然科学基金重点项目(2006kj060a)

摘　　要：利用CI-340便携式光合作用系统测定仪,在晴天条件下对三种红叶石楠品种火艳石楠（Photinia×fraseri’Camely’）、红罗宾石楠（Photinia×fraseri’Red Robin’）和小叶红叶石楠（Photinia×fraseri’Parvifolia’）的光合特性进行了比较研究.结果表明：（1）三个红叶石楠品种叶片的净光合速率（Pn）日变化均呈＂双峰＂曲线,在中午均有明显光合＂午休＂现象.通过对它们的净光合速率（Pn）日变化的比较研究,可知红罗宾石楠不耐强光.（2）三个红叶石楠品种的净光合速率、蒸腾速率和气孔导度的日平均值一致表现为：小叶红叶石楠〉火艳石楠〉红罗宾石楠,表明小叶红叶石楠在自然栽培条件下光合作用旺盛.（3）根据胞间CO2浓度（Ci）和气孔导度（Gs）的变化方向,推测三种红叶石楠品种的光合＂午休＂主要受非气孔因素限制.Photosynthetic rate（Pn）,intercellular CO2 concentration（Ci）,stomatal conductance（Gs） and transpiration rate（Tr） of three cultivars in Photinia×fraseri were measured with CI-340 portable photosynthesis system under sunny conditions.The results showed that the diurnal changes of Pn in the three cultivars all exhibited ＂double peak curve＂ and ＂midday depression＂ at midday,indicating that Photinia×fraseri Redobin couldn’t bear burning sunlight;the orders of the diurnal averages of their Pn,Tr and Gs were all Photinia×fraseri ParvifoliaPhotinia×fraseri CamelyPhotinia×fraseri Redobin,which illustrated that the photosynthesis of Photinia×fraseri was the strongest in the natural cultivation conditions.Additionally,according to the changing directions of their Pn,Ci and Gs,we could infer that ＂midday depression＂ of the three cultivars was not related to stomata.

关 键 词：红叶石楠 栽培品种 光合特性 日变化 净光合速率 

分 类 号：S682[农业科学—观赏园艺]