纳米粒度测量应用案例.docx

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1、纳米粒度测量应用案例-60-Omni文献名：A1teredce11wa11propertiesareresponsib1eforammonium-reduceda1uminiumaccumu1ationinriceroots作者：WEIWANG,XUEQIANGZHAO,RONGFUCHEN,XIAOYINGDONG,PING1AN,JIANFENGMAandRENFANGSHEN摘要：Thephytotoxicityofa1uminium(A1)ionscanbea11eviatedbyammonium(NH4+)inriceandthiseffecthasbeenattributedtot

2、hedecreasedA1accumu1ationintheroots.Here,theeffectsofdifferentnitrogenformsonce11wa11propertieswerecomparedintworicecu1tivarsdifferinginA1to1erance.AninvitroA1-bindingassayrevea1edthatneitherNH4+norN03-a1teredtheA1-bindingcapacityofce11wa11s,whichwereextractedfromp1antsnotprevious1yexposedtoNsources

3、.However,ce11wa11sextractedfromNH4+-supp1iedrootsdisp1ayed1owerA1-bindingcapacitythanthosefromN03-sup1iedrootswhengrowninnon-bufferedso1utions.Fourier-transfrminfraredmicrospectroscopyana1ysisrevea1edthat,comparedwithN03-supp1iedroots,NH4+-supp1iedrootspossessedfewerA!-bindinggroups(-OHandCOO-)and1o

4、wercontentsofpectinandhemice11u1ose.However,whengrowninpH-bufferedso1utions,thesedifferencesinthece11wa11propertieswerenotobserved.Furtherana1ysisshowedthattheA1-bindingcapacityandpropertiesofce11wa11swerea1soa1teredbypHsa1one.Takentogether,ourresu1tsindicatethattheNH4+-reducedA1accumu1ationwasattributedtothea1teredce11wa11propertiestriggeredbypHdecreaseduetoNH4+uptakeratherthandirectcompetitionforthece11wa11bindingsitesbetweenA13+andNH4+.关键词：A1-bindingcapacity;nitrate;pH