文献类型：期刊文献

中文题名：崖柏与侧柏光合特性和叶绿素荧光参数的比较研究

英文题名：Comparison on Photosynthetic Characteristics and Chlorophyll Fluorescence Parameters between Thuja sutchuenensis and Platycladus orientalis

作者：刘建锋[1,2] 杨文娟[1] 史胜青[1] 郭泉水[3] 江泽平[1]

第一作者：刘建锋

机构：[1]中国林业科学研究院林业研究所;[2]国家林业局林木培育重点实验室;[3]中国林业科学研究院森林生态环境与保护研究所

年份：2011

卷号：31

期号：10

起止页码：2071-2077

中文期刊名：西北植物学报

外文期刊名：Acta Botanica Boreali-Occidentalia Sinica

收录：CSTPCD;;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：中央公益性科研院所专项基金(RIF2010-15);国家林业局野生植物保护管理项目(1691000401)

语种：中文

中文关键词：崖柏;侧柏;光合特征;叶绿素荧光;生态适应性

外文关键词：Thuja sutchuenensis; Platycladus orientalis; photosynthetic characteristic; chlorophyll fluorescence; ecological adaptability

分类号：Q945.1

摘要：以盆栽的中国特有濒危植物崖柏及其近缘广布种侧柏幼苗为材料,测定了二者的光照和二氧化碳响应特征参数、光合作用气体交换参数和叶绿素荧光参数,比较分析两者间差异并探讨崖柏异地保存的可行性。结果显示:(1)在光响应参数方面,崖柏和侧柏的表观量子效率分别为0.039和0.027 mol.mol-1,但二者差异不显著;崖柏的光补偿点(81.04μmol.m-2.s-1)显著高于侧柏(59.72μmol.m-2.s-1),但二者的最大净光合速率(Pmax)、光饱和点(LSP)和暗呼吸速率(Rd)均无显著差异;崖柏的CO2补偿点(129.17μmol.mol-1)显著高于侧柏(95.86μmol.mol-1),而光呼吸速率则崖柏略高于侧柏,但二者的羧化效率相当。(2)气体交换参数方面,崖柏的叶片气孔导度和蒸腾速率均低于侧柏,而瞬时水分利用效率和气孔限制值则略高于侧柏;随着光照强度增加,崖柏和侧柏的净光合速率和胞间CO2浓度增加,而气孔限制值则降低。(3)2个树种的叶绿素荧光参数,如初始荧光、最大荧光、可变荧光、光系统Ⅱ原初光能转换效率、光系统Ⅱ实际光化学量子效率、非光化学猝灭等均无显著差异,但崖柏光化学猝灭系数(0.218)显著低于侧柏(0.322)。研究表明,崖柏与侧柏在光合特性和叶绿素荧光参数方面具有较大的相似性,也表明崖柏在生长季对北迁环境具有较强的适应性。
The paper focused on the ecological adaptability of an endemic and endangered species,Thuja sutchuenensis,by detecting the difference of the photosynthetic characteristic,gas exchange and chlorophyll fluorescence parameters from its related widespread species,Platycladus orientalis.The results showed that：（1）For the light response parameters,the apparent quantum efficiency（α） of T.sutchuenensis and P.orientalis were not significantly different,and were 0.039 mol·mol-1 photons and 0.027 mol·mol-1 photons,respectively.However,the light compensation point（LCP） of T.sutchuenensis（81.04 μmol·m-2·s-1） was significantly higher than that of P.orientalis（59.72 μmol·m-2·s-1）（P0.05）,but no significant differences between the two species happened in the maximum net photosynthetic rate（Pmax）,light saturation point（LSP） and dark respiration rate（Rd）.The CO2 compensation point（CCP） of T.sutchuenensis,129.17 μmol·mol-1,was significantly higher than that of P.orientalis（95.86 μmol·mol-1）（P0.05）;the photorespiration rate（Rp） of T.sutchuenensis was slightly higher than that of P.orientalis,but both had quite similar in the value of the carboxylation efficiency（Ce）;（2）For gas exchange parameters,the leaf stomatal conductance（Cond） and transpiration rate（Tr） of T.sutchuenensis were lower,but its instantaneous water use efficiency（WUE） and stomatal limitation value（Ls） were slightly higher than those of P.orientalis.Net photosynthetic rate（Pn） and intercellular CO2 concentration（Ci） both increased with the light intensity,while the stomatal limitation value（Ls） decreased;（3）Chlorophyll fluorescence parameters of the two species,such as the initial fluorescence（F0）,maximum fluorescence（Fm）,variable fluorescence（Fv）,PS Ⅱ primary energy conversion efficiency（Fv/Fm）,actual PS Ⅱ photochemical quantum efficiency（ΦPSⅡ） and non-photochemical quenching（NPQ） were not significantly different in the two species.However,the photochemical quenching（PQ） of T.sutchuenensis was significantly lower than that of P.orientalis,which were 0.218 and 0.322,respectively.The above results showed that,the photosynthesis and chlorophyll fluorescence parameters of T.sutchuenensis exhibited greater similarity with P.orientalis,which indicated T.sutchuenensis had a strong adaptability to the northern environment during the growing season.