文档介绍：第四章植物大量元素(钾)Section1GeneralIngeneral,~5%(%)(cells,tissues,long-distancetransport),,whichisabout100~200mM,(%)细胞质液泡012345K+浓度(nmol/l)3002001000UnlikeNandP,Kexistsinplantasanion(K+),+involves:neutralizingthesolubleandinsolubleanion;StablingpHbetween7and8;Regulatingosmoticpressure;Enzymeactivation;Adaptationtostress---------pletelydependonorarestimulatedbyK+.ATPase,pyruvatekinase(果糖激酶)6-phosphofructokinase(6-磷酸果糖激酶)ProteinSynthesisItisnowwellestablishedthatK+isrequiredforproteinsynthesisinhigherplantsK+isinvolvedinseveralstepsofthetranslationprocess,(aa,amide,andnitrate)whenK++affectsphotosynthesisatvariouslevels:※Enhancingchlorophyllsynthesis;※Improvingchloroplaststructure;※IncreasingCO2fixation;※++.