文献类型：期刊文献

中文题名：不同光照时间对欧美杨幼苗生长和光合特性的影响

英文题名：Effects of Different Irradiation Duration on Growth and Photosynthetic Characteristics of Populus × euramericana Seedlings

作者：刘成功[1] 王明援[1] 刘宁[1] 丁昌俊[1] 顾炳国[2] 陈存[1] 宁坤[1] 苏晓华[1] 黄秦军[1]

第一作者：刘成功

通信作者：Huang, Qinjun

机构：[1]林木遗传育种国家重点实验室国家林业和草原局林木培育重点实验室中国林业科学研究院林业研究所;[2]河北省滦南县园林绿化管理局

年份：2018

卷号：54

期号：12

起止页码：33-41

中文期刊名：林业科学

外文期刊名：Scientia Silvae Sinicae

收录：CSTPCD;;EI(收录号：20190806543552);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金："十二五"农村领域国家科技计划课题"阔叶树速生丰产林定向培育技术研究"(2015BAD09B02)

语种：中文

中文关键词：光照时间;欧美杨;生长;光合作用;荧光特性

外文关键词：light time;Populus × euramericana;growth;photosynthesis;fluorescence characteristics

分类号：S718.43

摘要：【目的】研究不同光照时间下欧美杨生长过程中长势及生理适应性,为其优良高光效品种的早期选育及推广栽培提供一定的理论依据。【方法】以16个欧美杨无性系幼苗为研究对象,全遮光条件下,采用LED-100 W全光谱植物生长灯进行人工控光试验,探讨不同光照时间(11、12、13、14和15 h)对欧美杨幼苗生长、生物量、叶绿素相对含量及光合特性等的影响。【结果】1)光照14 h和15 h下幼苗的苗高地径相对增长率、叶生物量显著高于其他光照下(P<0.01),而根冠比和叶片SPAD值相对较低,且幼苗光响应曲线走势基本一致,随光合有效辐射(PAR)增加,叶片净光合速率(P_n)先迅速增加,达光饱和点后曲线开始趋于平缓,直角双曲线拟合效果良好(相关系数R^(2 )≥0.948); 2)叶片最大净光合速率(P_(max))随光照时间的延长而增大,其中光照15 h比11 h高104.53%。光照15 h叶片表观量子效率(AQY)、暗呼吸速率(R_d)和光补偿点(LCP)最高,光照14 h光饱和点(LSP)较高,仅次于13 h,而LCP和R_d均低于其他光照时间; 3)叶绿素荧光参数显示,光照11 h幼苗的初始荧光(F_o)最大,最大荧光(F_m)总体差异未达极显著水平(P> 0.01),可变荧光(F_v)在光照13 h相对较高。随光照时间延长PSⅡ反应中心原初光能转化效率(F_v/F_m)及潜在光化学活性(F_v/F_o)逐渐增大,且F_v/F_m均在0.83～0.85之间。【结论】随光照时间的延长,欧美杨幼苗的P_(max)、F_m、F_v、F_v/F_o和F_v/F_m均逐渐增大,F_o和根冠比逐渐减小,此外SPAD值、AQY、LSP、LCP和R_d对光照时间也存在不同程度的响应。此结果可作为早期估测欧美杨生长量和生态适应性的参考依据之一,也可作为欧美杨新品种选育、良种推广应用及生产实践过程的重要参考。
【Objective】This study investigated the growth and physiological adaption of the growth process of Populus×euramericana in different irradiation duration,in order to provide a theoretical basis for the early breeding and promotion of the superior varieties with high photosynthetic efficiency.【Method】In this paper,seedlings of16P.×euramericana clones were taken as experimental materials,and artificial light control tests were performed with LED-100W full spectrum plant growth lamp under all shading conditions to study the influence of different irradiation duration(11h,12h,13h,14h and15h)on the seedlings growth,the biomass,the relative content of chlorophyll and the photosynthetic characteristics of P.×euramericana.【Result】1)The results showed that relative growth rate of height and root diameter,and leaf biomass of seedlings under14h and15h irradiation were significantly higher than those under other irradiation duration(P<0.01).On the contrary,the root-shoot ratio and leaf SPAD value were relatively low.The trends of light-response curves of seedlings under different irradiation duration were basically consistent.With the increase of photosynthetically active radiation(PAR),the net photosynthetic rate(Pn)of leaves increased rapidly at first,and then began to flatten after reaching the light saturation point.The rectangular hyperbola was a favorable model for fitting the light-response curve data(R^2≥0.948).2)The maximum net photosynthetic rate(Pmax)of leaves increased as the light time prolonged,and was104.53%higher with15h irradiation than that with11h irradiation.Apparent quantum yield(AQY),dark respiration(Rd),and light compensation point(LCP)were the highest with15h irradiation.Light saturation point(LSP)was relatively higher under14h irradiation,with only lower than13h irradiation,while LCP and R d were lower than all the other irradiation duration.3)The chlorophyll fluorescence parameters showed that basis fluorescence(Fo)of seedlings under11h irradiation was the highest,and the maximum fluorescence(Fm)was not significantly different(P>0.01).Variable fluorescence(Fv)of seedlings under13h irradiation was relatively higher.The efficiency of solar energy conversion(Fv/Fm)and potential activity of PSⅡ(Fv/Fo)increased gradually with the increase of irradiation time,and the value of(Fv/Fm)ranged from0.83to0.85.【Conclusion】Within the scope of this study,as the extension of light time,the Pmax、Fm、Fv、Fv/Fo and Fv/Fm of P.×euramericana seedlings increased gradually,while Fo and root-shoot ratio decreased gradually.Besides,SPAD value,AQY,LSP,LCP,and R d also had different responses to irradiation duration.Therefore,we suggest that the results can be used as an indicator of the early growth and the ecological adaption of P.×euramericana seedlings,also can be used as an important reference of the new varieties breeding,the application of breeding varieties and production practices.