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1、中国水稻科学(ChinJRiceSci),2013,27(2):168-176http://www.ricesci.cn168DOI:10.3969/j.issn.1001-7216.2013.02.009高产氮高效型粳稻品种的叶片光合及衰老特性研究李敏1,2张洪程2,*杨雄2葛梦婕2魏海燕2戴其根2霍中洋2许轲2(2*1贵州省水稻研究所,贵州贵阳550006;扬州大学农业部长江流域稻作技术创新中心,江苏扬州225009;通讯联系人,E-mail:hczhang@yzu.edu.cn)LeafPhotosynthesisandSenescenc
2、eCharacteristicsofjaponicaRiceCultivarswithHighYieldandHighN-efficiencyLIMin1,2,ZHANGHong-cheng2,*,YANGXiong2,GEMeng-jie2,WEIHai-yan2,DAIQi-gen2,HUOZhong-yang2,XUKe2(1RiceResearchInstituteofGuizhouProvince,Guiyang550006,China;2InnovationCenterofRiceTechnologyinYangtzeRiceVal
3、ley,MinistryofAgriculture,YangzhouUniversity,Yangzhou225009,China;*Correspondingauthor,E-mail:hczhang@yzu.edu.cn)LIMin,ZHANGHongcheng,YANGXiong,etal.LeafphotosynthesisandsenescencecharacteristicsofjaponicaricecultivarswithhighyieldandhighN-efficiency.ChinJRiceSci,2013,27(2):
4、168-176.Abstract:Thedifferenceinleafphotosynthesisandsenescencecharacteristicsoflow-yieldingandlowN-efficiency,high-yieldingandmediumN-efficiency,high-yieldingandhighN-efficiencyricecultivarswasinvestigatedusingsixrep-resentativejaponicavarietiesundertheiroptimumNlevels,resp
5、ectively.Theresultswereasfollow:comparedwithlow-yieldingvarieties,thehigh-yieldingonesshowedhigherpopulationleafareaindex(LAI),higherleafarearatesofproductivetillersandtop3leaves,higherflagleafchlorophyllcontent(SPADvalue)andnetphotosyntheticrate,andslowersenescenceofleaves.
6、Amonghigh-yieldingvarieties,asthenitrogenefficiencyincreased,thepopulationleafar-eaindex(LAI)reducedattheearlyandmiddlegrowthstages(N-n,jointing,andfullheading),andincreasedatma-turing.Thoughwithnosignificantchangesduringearlygrainfillingstage(0-10daysafterfullheading),thene
7、tpho-tosyntheticrateremarkablyincreasedinmiddleandlategrainfillingstages(20-40daysafterfullheading),whichcouldmainlybeattributedtothelessbreaking-downofchlorophyll,ensuringthehigherCO2assimilationcapacityofleaves,thehigherSODactivityprovidingstrongantioxidantcapacityofthepla
8、nt,andthelowerMDAcontentimplyingthelessdamagedegreeofmembranelipid.Itcouldb
