摘要
以菊花品种“红面”(Hongmian)为试材,进行(32±2)℃/(22±2)℃(昼/夜)高温下的光周期实验,每日光周期光照/黑暗时长分别设置为7h/17h(记为Ph7)、8h/16h(Ph8)、9h/15h(Ph9)、10h/14h(Ph10)和11h/13h(Ph11),以13h/11h(CK)作为对照。试验于2019年7月20日开始,至8月25日菊花苗中出现柳芽结束。在菊花柳芽形成前分别测定分析叶片光响应曲线及快速荧光诱导动力学曲线,以了解高温下滞育菊花不同处理的光系统及光合性能差异。结果表明:(1)Ph7、Ph8处理菊花光合色素含量最低,光系统II(PS II)的反应中心及放氧复合体、光系统I(PS I)末端电子受体库NADP+的还原在26d试验中期稍有缓和以外,其余时间均为受抑制状态,光合能力也表现最差。Ph7、Ph8处理光系统受损最为严重。(2)Ph10为各处理中首个出现柳芽花序分化异常的处理,其光合潜力较大,但PSII放氧复合体始终失活,光合作用随着PSII光合单位间能量连接的忽强忽落而不断变化。Ph10菊花叶片的光系统最为敏感。(3)Ph11处理叶片光合色素为继CK后的最大值,光合性能较稳定,持续增强的PSI、PSII活性使光电子在放氧复合体失活的前提下正常传递输送。Ph11菊花叶片光系统抗逆性最强。
Chrysanthemum is a typical short−day plant,which blossoms only when the sunshine length is shorter than the critical day length,and the critical day length is 12 h·d−1.In order to meet the market demand and promote the chrysanthemum to bloom in the long sunshine season,black shading materials are often used to shorten the day.There were many studies on short−day treatment to control the flowering period of chrysanthemum at home and abroad,but they failed to solve the problem of high temperature obstacle of willow buds in chrysanthemum during shading in summer.The appearance of willow buds indicates that chrysanthemum is still in the vegetative growth stage,and the process of flower bud differentiation is hindered.Continuous high temperature environment is an important factor leading to the emergence of willow buds in chrysanthemum.In this experiment,chrysanthemum variety"Hongmian"was used as the test material.The photoperiod experiment was carried out at high temperature of(32±2)℃/(22±2)℃(day/night),and the photoperiod duration was set as 7h/17h(Ph7),8h/16h(Ph8),9h/15h(Ph9),10h/14h(Ph10)and 11h/13h(Ph11),respectively with 13h/11h(CK)as control.The experiment began on July 20,2019,and ended on August 25,2019 when willow buds appeared in chrysanthemum seedlings.The photosynthetic structure of chrysanthemum leaves is very sensitive to adversity,which is the primary site of adversity damage.The light response curve,photosynthetic pigment content(including chlorophyll a,chlorophyll b,carotenoid and chlorophyll total)and rapid fluorescence induction kinetics curves of leaves were measured and analyzed before the formation of chrysanthemum willow buds.The curves of chlorophyll fluorescence kinetics OJ,OI,OK and IP phases were standardized as relatively variable fluorescence W,WOJ=(Ft−F0)/(FJ−F0),WOI=(Ft−F0)/(FI−F0),WOK=(Ft−F0)/(FK−F0),WIP=(Ft−FI)/(FP−FI),and the fluorescence differential kineticsΔW was calculated,ΔW=W−Wref,where Wref is the relatively variable fluorescence at the corresp
作者
陆思宇
杨再强
张源达
郑涵
杨立
LU Si-yu;YANG Zai-qiang;ZHANG Yuan-da;ZHENG Han;YANG Li(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science&Technology,Nanjing 210044,China;Jiangsu Provincial Key Laboratory of Agrometeorology,Nanjing 210044)
出处
《中国农业气象》
CSCD
北大核心
2020年第10期632-643,共12页
Chinese Journal of Agrometeorology
基金
国家重点研究开发计划(2019YFD1002202)。
关键词
菊花
光周期
光系统
光合电子传递
光合作用
Chrysanthemum
Photoperiod
Photosynthetic system
Photosynthetic electron transfer
Photosynthesis
