文献类型：期刊文献

中文题名：2个种源栓皮栎对干旱及复水的光合生理响应

英文题名：Photosynthetic responses to drought and subsequent re-watering in seedlings from two different provenances of Quercus variabilis Bl

作者：陈梦园[1] 李迎超[1] 王利兵[1] 张璐[2] 李东兴[1] 句娇[1] 于海燕[1]

第一作者：陈梦园

机构：[1]中国林业科学研究院林业研究所,国家林业和草原林木培育重点实验室,北京100091;[2]东北农业大学园艺园林学院,哈尔滨150030

年份：2019

卷号：0

期号：10

起止页码：2950-2958

中文期刊名：生态学杂志

外文期刊名：Chinese Journal of Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家重点研发计划项目课题(2017YFD0600602)资助

语种：中文

中文关键词：栓皮栎;干旱;复水;气体交换;叶绿素荧光参数

外文关键词：Quercus variabilis Bl.;drought;re-watering;gas exchange;chlorophyll fluorescence

分类号：S792.18;S761.1

摘要：为了探究干旱复水对2个种源栓皮栎幼苗光合生理特性的影响,测定了不同水分处理(正常供水、轻度干旱、中度干旱和重度干旱)及复水处理下盆栽栓皮栎幼苗生长、叶片气体交换及叶绿素荧光参数。结果表明:随着干旱胁迫程度的加重,幼苗生长受到的抑制程度增加;气体交换参数净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和水分利用效率(WUE)均呈下降的趋势,而气孔限制值(Ls)呈上升趋势,在重度干旱胁迫下气体交换参数变化幅度最大;叶片非光化学猝灭系数(NPQ)呈现先上升后下降的趋势,PSII潜在活性(Fv/Fo)、最大光化学效率(Fv/Fm)、电子传递速率(ETR)和实际光量子效率(ΦPSⅡ)均呈下降趋势。主要叶绿素荧光参数对干旱胁迫的响应与气体交换参数一致,即重度胁迫对光合电子传递造成了最严重的损伤。干旱后复水,导致栓皮栎光合生理参数不同程度的恢复。就种源地而言,老君山种源的幼苗在干旱胁迫下主要参数的变化程度大于北坡山种源的幼苗,且在复水后老君山种源幼苗恢复程度低于北坡山种源,表明北坡山种源的栓皮栎抗旱力和恢复力均强于老君山种源。
To investigate the effects of drought stress and subsequent re-watering on photosynthetic characteristics of seedlings from two different provenances of Quercus variabilis Bl.,we measured the growth,gas exchange,and chlorophyll fluorescence parameters of seedlings under different water treatments(normal irrigation,slight drought,moderate drought,and severe drought)and following re-watering.The results showed that the growth of seedlings was inhibited by drought stress,and it was most strongly affected under severe drought stress.Gas exchange parameters,such as Pn,Gs,Trand WUE,had decreasing trends,while Lsshowed the upward trend with the increases of drought stress.Chlorophyll fluorescence parameters,such as Fv/Fo,Fv/Fm,ETR andΦPSⅡ,showed decreasing trends with the increasing intensity of drought stress.The NPQ value increased under moderate drought and declined under severe drought.The response of many chlorophyll fluorescence parameters to drought stress was consistent with that of some gas exchange parameters.For example,the highest response was found under severe drought.Re-watering after drought stress resulted in somewhat recovery of these physiological parameters.Generally,the relative changes of these parameters of seedlings from the Laojun Mountain provenance were higher than those from the Beipo Mountain provenance,and the recovery of seedlings from Laojun Mountain provenance was lower than that of the Beipo Mountain provenance after re-watering.In conclusion,the drought tolerance and resilience of seedlings from the Beipo Mountain provenance were better than those from Laojun Mountain provenance.