摘要
以冬小麦为供试材料,在大田试验条件下研究了模拟太阳辐射减弱对冬小麦旗叶光合色素、叶绿素荧光参数及气体交换的影响。试验中设计了15%、20%、40%、60%和100%(CK)自然太阳总辐射5种太阳总辐射处理,同时采用Diving-PAM叶绿素荧光仪和LCpro+光合仪测定了不同灌浆阶段作物叶绿素荧光及气体交换参数的动态变化。结果表明,太阳辐射减弱效应显著提高了冬小麦各灌浆期的叶绿素、叶黄素含量,但降低了Chla/Chlb和光合速率(Pn)。Fv/Fm、qP、Y(NO)、(1-qP)/NPQ及实际光量子效率(Yield)均随太阳辐射强度下降而呈现下降的趋势,而NPQ、Y(NPQ)和L(PFD)呈上升趋势。可见,太阳辐射减弱时冬小麦叶片会下调PSⅡ原初光化学反应的电子传递效率来适应光能不足的逆境胁迫(光化学猝灭系数qP的下降),同时降低电子递体(PQ)的活性(量子效率Yield降低),增加叶片热耗散,导致光合能力降低。
In the recent years,global dimming of solar irradiance is growing due to the increase of aerosols,air pollutants and population density.In order to elucidate the effects of reduced solar irradiance on chlorophyll fluorescence parameters and gas exchange of winter wheat cultivar,we conducted a field experiment in Nanjing city by using the Triticum aestivum L.（cv.Yang mai 13） as the experimental plants.Five reduced solar radiation treatments were set up in the experiments,including 15%（T4）,20%（T3）,40%（T2）,60%（T1）and 100%（CK）of natural solar radiation,while using Diving-PAM chlorophyll fluorometer and LCpro＋ photosynthesis to measured at different grain filling stages of crop chlorophyll fluorescence and gas exchange of the dynamic changes.The results showed that reducing solar radiation significantly increased chlorophyll and lutein content of winter wheat in the grain filling stage,but the Chla/Chlb and photosynthetic rate（Pn） continued to decrease.Fv/Fm,qP,Y（NO）,（1-qP）/NPQ and the actual photochemical efficiency（Yield） increased with solar radiation intensity decreased,and show a downward trend,but NPQ,Y（NPQ） and L（PFD） rised.Visible,less solar radiationis cut in winter wheat leaves,when the primary photochemical reaction of PSⅡelectron transfers efficiency met the energy shortage of stress（a decline in photochemical quenching qP）.Meanwhile,reducing the electronic delivery of the body（PQ） activity（quantum efficiency Yield was lower）,was to increase the heat dissipation leaves,resulting in reduced photosynthetic capacity.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第8期1489-1499,共11页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(41075114)
江苏省高校自然科学研究重大项目(09KJA170004)
江苏省普通高校研究生科研创新计划项目(CX10B_291z)
