简介：Tocomparetheeffectsofslow-releasenitrogenfertilizeratsixdifferentlevelsontheflagleafchlorophyllfluorescencecharacteristicsofsuperhybridrice,afieldfertilizationexperimentwasconductedwithsuperhybridriceYLiangyou1asatestmaterial.Thephotosyntheticelectrontransportrate(ETR),effectivequantumyield(EQY),photochemicalquenchingcoefficient(qP),andnon-photochemicalquenchingcoefficient(NPQ)offlagleavesweremeasuredattheinitialheading,fullheading,10dafterfullheadingand20dafterfullheadingstages.ResultsshowedthatthevaluesofETR,EQYandqPincreasedwithricedevelopmentfrominitialheadingto20dafterfullheading,whereastheNPQdecreased.Duringthemeasuredstages,ETR,EQYandqPincreasedinitiallyandthendecreasedasnitrogenapplicationamountincreased,buttheypeakedatdifferentnitrogenfertilizerlevels.ThemaximumETRandEQYvaluesappearedatthetreatmentof135kg/hm2N.Inconclusion,theoptimumnitrogenamountforchlorophyllfluorescencecharacteristicsofsuperhybridricewas135180kg/hm2.

简介：Acold-tolerantcultivar,Xiangnuo1,andacold-sensitivecultivar,IR50,wereusedtostudytheinfluenceofchillingonphotosyntheticrateandchlorophyllfluorescenceparametersinriceseedlings.Thephotosyntheticratesdeclineddramaticallyduringchilling,anddecreasedby48.7%and67.5%inXiangnuo1andIR50seedlings,respectively,afterbeingsubjectedtochillingtreatmentfortwodays.ChlorophyllfluorescencemeasurementsshowedthatrelativelyhigherqPandqNPinXiangnuo1weremaintainedtodissipatetheredundantexcitationenergyandprotectthereactioncentersfromchillinjury;accordingly,redundantexcitationenergyaccumulatedlessinthereactioncenters,andantennasystemswerelessinjuredbychillinginXiangnuo1.Onthecontrary,inIR50,qPandqNPdeclinedrapidlywhileExincreased,asthechillingpersisted.ThisresultindicatedthatthereactioncentersandantennasystemsinIR50weredamagedseverelybychilling,whichledtothelowerphotosyntheticrate.

简介：Pinusdensifloravar。zhangwuensis变得快，并且它的干旱和咸度抵抗比Pinussylvestrisvar好。mongolica。我们比较了在二种之间的冷强壮的冷强壮和机制，到为支持并且适用P提供一个理论基础。densifloravar。在冷区域的zhangwuensis。一个冷压力实验在P的3岁的小植物上被执行。densifloravar。zhangwuensis和P。sylvestrisvar。在在五温度政体变硬以后的mongolica，5，10，20，40，并且60?瑩??欠灡慰愠??杭洿????猯灵￣桳睯摥愠猠浩汩牡椠据敲獡?湩栠楥桧?畢?楤灳慬敹??楨桧牥椠据敲獡摥椠?潴慴?档潬潲桰汹?愠瑣癩瑩敩?景爠'T獩潣???湡??呓?湡?敬敶?景??愠摮?????猯'T￣桴湡琠潨敳琠敲瑡摥眠瑩??欠灡慰愠??杭洿????猯灵？