孕穗期低温对水稻产量的影响及其生理机制-论文.pdf

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1、中国水稻科学(ChinJRiceSci)，2014，28(3)：277～288httpt{{Ⅵ．ricesci．cnDOI：10．3969／j．issn．10017216．2014．03．007277孕穗期低温对水稻产量的影响及其生理机制李健陵，3霍治国2吴丽姬1朱庆华胡飞，(1华南农业大学农学院，广州510642；2中国气象科学研究院，北京100080；3中国农业科学院农业环境与可持续发展研究所／农业部农业环境重点实验室，北京100081；通讯联系人，E—mail：hufei@scau．edu．on)EffectsofLowTem

2、peratureonGrainYieldofRiceandItsPhysiologicalMechanismattheBootingStageLIJian—ling，u，HuoZhi—guo，WuLi—ji，ZHUQing—hua，HUFei'(JCollegeofAgriculture，SouthChinaAgriculturalUniversity，Guangzhou510642，China；0ChineseAcademyofMeteorologicalSciences，Beijing10081；3InstituteofEnvi

3、ronmentandSustainableDevelopmentinAgricultvre，ChineseAcademyofAgriculturalSciences／KeyLaboratoryforAgro—Environment，MinistryofAgriculture，Beijing100081；C。rP户Dgauthor，E—mail：“fei@scau．edu．cn)IIJianling，HU0Zhiguo，wULiji，eta1．Effectsoflowtemperatureongrainyieldofriceandit

4、sphysiologicalmechanismatthebootingstage．ChinJRiceSci，2O14，28(3)：277—288．Abstract：Lowtemperature，especiallyoceuredatbootingstage，wouldcausesterilityofricefloretsandbecameoneofrestrictingfactorsofriceyield．Inordertoevaluatetheeffectoflowtemperatureonyieldofrice，andascer

5、tainthelowtemperaturewarningindicatoratbootingstageinSouthChina，acontrolledexperimentwasconductedwithtwocultivars．Tianyou998andGuinongzhanatfourdailyminimumtemperaturelevels(18，16，14，and12℃。diurnaltemperaturerangeis4℃，nuturalairtemperatureasCK)withthreedurations(1，3，an

6、d5d)．Theresultsshowedthatunderthe1owtemperaturetreatmentduringthebootingstageofearly-seasonrice，SODandPODenzymeactivitiesofthesecondleaffromtopdecreased，MDAcontentinereased，SPADvalueandphotosyntheticratedeclined，thepercentageofpollenfertilityandspikelet—fertilizedrated

7、ecreased．Thenumberofgrainsperpanicle，seed—settingrate，and1000一grainweightdecreased，leadingtoareductioningrainyield．WhenT⋯≤16℃(3d)，thegrainyieldofTianyou998andGuinongzhansignificantlydecreased，aswellasdevelopmentprogressofgrainsandphotosynthesisofthesecondleaffromtop(P<

8、O．05)．Thelowertemperatureand1ongerdurationhaveagreaterinfluenceonthedamagetorice．Thecold～toleranceofhybridriceTianyou