高温胁迫对高羊茅光合作用的影响  

High temperature stress with photosynthesis in Festuca arundinacea

作　　者：朱澜[1] 李雪芹[2] 贾晓琳[1] 王斌[1] 金松恒[1] 

机构地区：[1]浙江林学院林业与生物技术学院,浙江临安311300 [2]浙江林学院天目学院,浙江临安311300

出　　处：《浙江林学院学报》2009年第5期652-655,共4页Journal of Zhejiang Forestry College

基　　金：浙江省自然科学基金资助项目(Y3080446);浙江省科学技术厅"新苗人才"计划项目(21000013)

摘　　要：为了解高温胁迫对高羊茅Festuca arundinacea光合作用的影响,以2个高羊茅品种为实验材料,研究高温处理对高羊茅气体交换、叶绿素荧光的影响。结果表明,高温胁迫后,2个高羊茅品种的净光合速率(Pn)均明显下降,其中气孔因素引起了猎狗5号的Pn下降,但并不是交战2号Pn下降的原因。高温胁迫降低了光系统Ⅱ(PSⅡ)最大光化学量子效率(Fv/Fm)、PSⅡ反应中心捕获激发能效率(F′v/F′m)、光化学猝灭(qP)和电子传递速率(RET),且交战2号的下降幅度较大。但高温胁迫明显增加了高羊茅的非光化学猝灭(qNP),交战2号的qNP则略低于猎狗5号。2个高羊茅品种均可有效地耗散过剩的激发能,尽可能保护化合机构免受高温胁迫的影响。To uncover the adaptation mechanisms of photosynthesis for high temperature,gas exchange and chlorophyll fluorescence of Festuca arundinacea cultivars Crossfire 2 and Houndog 5 were tested under control （20 ℃） and high temperature stress （38 ℃） with four replications for net photosynthetic rate （Pn）,stomatal conductance （Gs）,intercellular CO2 concentrations （Ci）,maximum rate of photochemical quantum （Fv /Fm）,efficiency of excitation energy captured by PSⅡ （F′v /F′m）,photochemical quenching （qP）,non-photochemical quenching （qNP）, and electron transport flow （RET）. Results showed that after high temperature stress, Pn in both cuhivars significantly decreased （P〈0.05）, Gs and Ci decreased in ＇Houndog 5＇ , Gs slightly decreased l and Ci even increased in ＇Crossfire 2＇ Fv /F,, F′v/F′m, qP, and RET significantly decreased （P〈0.05） in both cuttivars; and qNP significantly increased（P〈0.05）. These resuits indicated that stomatal factors led to the P, decrease in ＇Houndog 5＇, but non-stomatal factors led to the P, decrease in nacea can protect its ＇Crossfire 2＇ , and that by effectively dissipating extra excitation energy, F. arundiphotosynthetic mechanism from high temperature stress.

关 键 词：植物学 高羊茅 高温胁迫 光合作用 

分 类 号：Q945.11[生物学—植物学] S688.4[农业科学—观赏园艺]