枸骨和无刺枸骨不同光强下光合能力的比较  

Comparison of Photosynthetic Capacity in Ilex cornuta and Ilex Corunta Var.fortunei under the Different Light Intensity

作　　者：何理坤 李雪芹[2] 金松恒[2] 

机构地区：[1]浙江省台州市林业科学研究所,浙江椒江318000 [2]浙江农林大学林业与生物技术学院,浙江临安311300

出　　处：《中国农学通报》2011年第13期37-41,共5页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金项目"高温胁迫下无柄小叶榕Rubisco活化酶超量合成的机制和作用"(30901144);浙江省自然科学基金项目"高温下无柄小叶榕RCA含量上升的机理和调控作用"(Y3090276)

摘　　要：为了研究枸骨及其变种无刺枸骨对光强的适应能力,笔者以枸骨和无刺枸骨为材料,研究在28℃测试条件下的光强依赖的气体交换和叶绿素荧光特性。结果表明,在相同的光强下,无刺枸骨的净光合速率(Pn)始终比枸骨的大,即外在地表明前者的光合能力在该地区表现更大。但是无刺枸骨的气孔导度(Gs)、蒸腾速率(Tr)和胞间CO2浓度(Ci)均比构骨的要低,说明构骨的Pn低下不是气孔因素引起。叶绿素荧光分析表明,无刺枸骨的PSII反应中心捕获激发能效率(Fv'/Fm')和电子传递速率(ETR)反而比构骨的要低,非光化学猝灭(NPQ)则比构骨的要高,但两者的光化学猝灭(qP)无明显区别,这些结果表明无刺枸骨的CO同化能力比枸骨的要大,可能是由于CO同化阶段相关酶活性比较高。To investigate the adaptive capacity to light irradiance,the author explored light-dependent the gas exchange and chlorophyll fluorescence properties in lex cornuta and Ilex Corunta Var.fortunei.The results showed that with increasing of light intensity under 28℃,there was a faster increase in net photosynthetic rate （Pn） in Ilex Corunta Var.fortunei,while a slower increase in lex cornuta,which indicated that the photosynthetic capacity in Ilex Corunta Var.fortunei was stronger in this region.However,the stomatal conductance （Gs）,transpiration rate （Tr） and intercellular CO 2 concentration （Ci） were higher,which indicated that the lower photosynthetic rate in Ilex Corunta was not resulted from the decrease of stomatal conductance.Further evidence by chlorophyll fluorescence showed that the efficiency of energy conversion of open PSⅡ （Fv＇/Fm＇） and its electron transport rate （ETR） was higher,while non-photochemical quenching （NPQ） was lower in Ilex Corunta,as compared to that in Ilex Corunta Var.fortunei.And there were no significance difference in photochemical quenching （qP） in two groups.The results suggested that the higher assimilation rate in Ilex Corunta Var.fortunei was probably associated with carbon assimilation.

关 键 词：枸骨 无刺枸骨 净光合速率 光强 叶绿素荧光 

分 类 号：S718.3[农业科学—林学]