梯度干旱胁迫对水稻叶片光合和水分状况的影响.pdf

《梯度干旱胁迫对水稻叶片光合和水分状况的影响.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、中国水稻科学(ChinJRiceSci)，2014，28(I)：65—70http}?ww．ricesci．cnDOI：1O．3969／j．issn．10017216．2014．01．00965梯度干旱胁迫对水稻叶片光合和水分状况的影响丁雷李英瑞1李勇2沈其荣1郭世伟，(1南京农业大学资源与环境科学学院，南京210095；2华中农业大学植物科学技术学院，武汉430070；*通讯联系人，E—mailsguo@njau．edu．on)EffectsofDroughtStressonPh0tosynthesisandWaterStatusofRiceLeavesDINGLei，

2、LIYing—rui，LIYong，SHENQi—rong，GUOShi—wei，(CollegeofResourcesandEnvironmentScience，NanjingAgriculturalUniversity，Nanjing210095，China；2CollegeofPlantScienceandTechnology，HuazhongAgriculturalUniversity，Wuhan430070，China；Correspondingauthor，E-mail：sguo@njau．edu．cn)DINGLei，LIYingrui，LIYong，eta

3、1．Effectsofdroughtstressonphotosynthesisandwaterstatusofriceleaves．ChinJRiceSci，2014，28(1)：657O．Abstract：Hydroponicexperimentswereconductedtocomparephotosynthesisandwaterstatusinriceleavesundernormalconditionsanddroughtstresssimulatedbyadditionof10，20and30polyethyleneglycol(PEG6000)．There

4、sultswerelistedasfollows：1)underdroughtstress，leafphotosynthesis，stomatalconductance，mesophyllconductance，totalconductance，andchloroplastieCO，concentrationweredecreased；2)therewasnosignificantdifferenceinnon—stomatallimitationunderdroughtstressandnormalconditions．Butcomparedwithnorma1cond

5、itions，stomatallimitationunder30PEGsimulateddroughtstressinYangdao6andShanyou63wereincreasedby42and81，respectively；3)therewerepositiverelationshipsbetweenphotosynthesisandstomatalconductance。mesophyllconductance，totalconductanceandchloroplasticCO2concentration；4)underseveredroughtstress(2

6、0and30)，leafwaterpotentialandwatercontentweredecreasedsignificantly．Andleafwaterpotentialwaspositivelycorrelatedwithstomatalconductance，mesophyllconductanceandtotalconductance．Therefore，reducedchloroplasticCO，concentrationresultedfromstomatalclosurewasthemajorlimitationofphotosynthesis．An

7、dthedecreasedleafwaterpotentialmayincreasetheinternalCO2transportresistance．Keywords：droughtstress；ph0tosyntheticrate；stomatallimitation；non-stomata11imitation；leafwaterpotential丁雷，李英瑞，李勇，等．梯度干旱胁迫对水稻叶片光合和水分状况的影响．中国水稻科学，2014，28(1)：65-70．摘要：采用温室营养液培养方式，通过添加0、10、20、30P