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1、植物营养与肥料学报2006,12(6):797-804PlantNutritionandFertilizerScience不同氮效率小麦品种的光合碳同化特性1,233113韩胜芳,李淑文,文宏达,李雁鸣,肖凯(1河北农业大学农学院,河北保定071001;2河北农业大学生命科学学院,河北保定071001)(3河北农业大学资源与环境科学学院,河北保定071001)摘要:不同氮效率小麦品种的子粒产量和氮效率在缺氮条件(-N)下均以氮高效品种(H)最高,中效品种(M)次之,低效品种(L)最低。在-N下,不同氮效率
2、品种相比,旗叶各测定期的光合速率(Pn)、叶肉导度(Gm)、碳酸酐酶(CA)2+活性、可溶性蛋白含量(SP)和RuBPcase活性均以H最高,M次之,L最低;叶绿素含量(Chl)、气孔导度(Gs)、Ca-2+ATPase活性和Mg-ATPase活性在不同氮效率品种之间的表现规律较差。结果还表明,光合作用底物CO2在液相中较强的传导能力和较强的暗反应活性,是氮胁迫条件下氮高效小麦品种具有较强光合碳同化能力和物质生产能力的重要生理基础。-N下的旗叶叶源量(LSC)、光合速率高值持续期(PAD)、叶绿素含量缓降
3、期(RSP)、叶面积(LA)和平均光合速率值以H最大,M次之,L最低;丰氮条件(+N)下,子粒产量、氮效率和旗叶光合生理参数大体以M较好,H次之,L较差,与-N下不同氮效率品种上述性状或参数的表现规律有所不同。关键词:小麦;氮效率;光合特性中图分类号:Q945111 文献标识码:A 文章编号:1008-505X(2006)06-0797-08Characterizationofphotosyntheticcarbonassimilationinwheatvarietieswithdifferent
4、Nefficiency1,233113HANSheng2fang,LIShu2wen,WENHong2da,LIYan2ming,XIAOKai(1CollegeofAgronomy,HebeiAgric.Univ.,Baoding071001,China;2CollegeofLifeScience,HebeiAgric.Univ.,Baoding071001,China;3CollegeofResour.andEnviron.,HebeiAgric.Univ.,Baoding071001,China)A
5、bstract:Usingthetypicalwinterwheat(Triticumaestivum)varietieswithhigh(H),middle(M)andlowN(L)effi2ciencyselectedinourpreviousresearchastestmaterials,thephotosyntheticcarbonassimilationcharacterizationinflagleafandtheunderlyingphysiologicalmechanismwerestud
6、iedunderfieldconditions.Theresultsshowedthatunderdefi2cientNcondition(-N),thehighestgrainyieldandnitrogenuseefficiencywereobservedinthevarietywithH,followedbyM,andL.Sowerethephotosyntheticrate(Pn),metaphyllconductance(Gm),carbonicanhydrase(CA)activity,sol
7、ubleproteincontent(SP)andRuBPcaseactivityofflagleaves.However,noregularitywasfoundforthechlorophyll2+2+content(Chl),stomatalconductance(Gs),Ca2ATPaseactivityandMg2ATPaseactivityamongthetestedvarietieswithdifferentNefficiency,indicatingthatthehigherconduct
8、ancecapabilityintheliquidphaseofCO2andhigherabilityofdarkreactioninphotosynthesisresultedinahigherphotosyntheticcarbonassimilationanddrymatterproductionforthehighNefficiencyvarietyhavingunderNstress.Theleafsourcecap
