低磷胁迫对不同水稻品种根系形态和养分吸收的影响

Vol.30,No.5pp.438442May,2004ACTAAGRONOMICASINICA305200454384423X(,330045)3,,(10mgPL)(015mgPL),,,,,;,;P;;;;;P;;:S511EffectofPhosphorusDeficiencyStressonRootMorphologyandNutrientAbsorptionofRiceCultivarsLIFeng,PANXiao2Hua3,LIUShui2Ying,LIMu2Ying,YANGFu2Sun(CollegeofAgronomy,JiangxiAgriculturalUniversity,Nanchang330045,Jiangxi,China)AbstractWithsandyculture,thedifferenceoftherootmorphology,assimilationproductdistribution,mineralnutrientabsorptionandenergyrequirementofanionabsorptionwereinvestigatedamongthelowphosphorustolerantrice(Oryzasati2vaL1)cultivars(DldandLtz3)andthelowphosphorussensitivecultivars(HzqandXsbl)at10mgPLand015mgPLphos2phorus(P)1Theresultsshowedthatunderlowphosphoruscondition,therootnumber,length,surface,andlateralrootlength,numberanddensityforthetolerantricecultivarsincreasedobviously,whilethoseforthesensitivecultivarswereonverseexceptlateralrootdensity;comparedwiththesensitivecultivars,moreassimilationproductsweredistributedtorootinthetolerantcultivars;theratioofroottoshootinallcultivarsincreased,butthetolerantcultivarsincreasedmoresignifi2cantly;lessenergyrequirementofanionabsorptionmightcontributetothemoremineralnutrientinthetolerantcultivars1KeywordsRice;Lowphosphorusdeficiency;Rootmorphology;Ratioofroottoshoot;Distributionofassimilationpro2ducts;Energyrequirementofanionabsorption,,[1][13],,,,11113[4],12h2gPkg10h,,,,Yashida[5],10mgPL(P10)015mgPL(P015),5d1,X::(1979-),,,E2mail:lfleaf@1631com13(Authorforcorrespondence):Received():2002211219,Accepted():20032042261pH51561121121125,,(STD1600EpsomUSA),WinRhizo(Version410B)(RegentInstrumentInc,Can2ada),P1121214CO214CO22509:006,60mL14CO2,60Ci,30min24h,,10510min,7080,,,50mgBH126,3,14C11213YSImodel53001h,,1h,pH515,26,15min1121425,10510min,7080,KCaMnMgCuFeNaZn,P22111,,,3,,,1Table1Effectoflowphosphorusonmorphologyofrootsystemofdifferentricecultivars(€xsx)CultivarTreatmentRootnumberPplantRootlengthPplantRootsurface(cm2)Lateralrootlength(cm)LateralrootnumberPplantLateralrootdensity(cm)P108821540131c3731416107bc62182129bc220186154b7861528199c4180104cDalidaoP01511651035105ab4091218113ab71141163a244108124a10401033154ab5170114b3P108791527158c3341927191c57194194c155159138c7901527158c5120101bcLiantangzao3P01512141045105a4361729191a72115178a248187134a11021036147a6150113aP1012041012173a364148141c55193139c215162101b7971031111c5120129bcHuzhanqiP015522101141d2271318117d3610215e123189136d4581512102d4190132cP1010981513144b4351915162a69131198ab248139144a9621024104b5110113bcXinsanbailiP0158651039160c3411325107c45174139d171178177c7541028128c5170165b:5%,Note:Differentsmalllettersinthesamecolumnindicatesignificantatthe5%level,thesamebelow1212(1),33133%6134%,30176%22139%,P,328197%27103%,12181%11148%21314C14C(3)314C4311%22172%,20126%11131%9345:1Fig.1Effectoflowphosphorusonbiomassofrootandshootofdifferentricecuitivars2PFig.2EffectoflowphosphorusonrootPshootratioofdifferentricecultivars2142,,CuNa3ZnCa,3NaMg,,FeMn,Zn3314CFig.3Effectoflowphosphorusondistributionof14C2assimilatesinrootofdifferentricecultivars215(3),,,26111%32166%,31110%9187%,,,25d,36120%29141%,3,18136%14106%2Table2EffectoflowphosphorusonabsorptionofnutrientsofdifferentricecultivarsCultivarTreatmentNutrientscontent(gPplant)PFeMnCuZnKNaCaMgP1068101163a1221610114b91161120b3190180abc68125141a56971067186a2951712149bc11091520155c15351311160aDalidaoP01522131160c147159178a181122103a4170139a72117147a56481076173a2881312199bc1915151199a10161010144d3P1048142179b84160129def65132145c3161151abc56104195b48291180196b314188179b14121218103b1026123122cdLiantangzao3P01517142115cd97164121c951212105b4120152ab48112166bc48721625194b2211212166d14611430135b6431313185fP1069131165a91146155cde65163196c2180100bcd46112197c44251038119b252186134cd927148133d11661017166bHuzhanqiP01511131153e79133159ef75170105c2160117cd35121193d36251995172c158166151e9621818195d6561017196fP1051124133b92136190cd36133112d1170111d46152130c34841627198c366158115a9291035112d10811729155cXinsanbailiP01512162173de75114194f39131185d2140102cd23190134e35661910114c2891423159bc9491919178d7441012173e044304Fig.4Effectoflowphosphorusonenergyrequirementsforanionuptakeindifferentricecultivars3[6],[7][8],,,P[911],[1113][11],,,,,[14],,(310-14molcm-1s-1),14mm[15],,[16][17][11],;,(2)[18]P,,:,;,[19],P[20],40d,,,[21],P,314CO2,14C,,P,,P,,,P,,,,,1445:References[1]PanX2H(),LiuS2Y(),LiF(),LiM2Y()1Effectoflow2phosphorusstressongrowthandphosphorusefficiencyofdifferentrice(OryzasativaL1)cultivarsseedlings1ActaAgriculturaeUniversitatisJiangxiensis(),2002,24(3):297-300[2]MingF(),MiG2H(),ZhangF2S(),ZhengX2W(),ZhuL2H()1Studiesonvarietaldifferenceofriceinresponsetolow2Pstressanditsphysiologicaladaptivemechanism1Chi2neseJournalofApplied&EnvironmentalBiology(),2000,6(2):138-141[3]WuP(),NiJ2J()1DetectionofthequantitativetraitoflociwithAFLPandRFLPmarkersforphosphorusuptakeanduseefficiencyinrice1ActaBotanicaSinica(),2000,42(3):229-233[4]CaoL2M(),PanX2H()1Screeningandidentifyingofrice(OryzasativaL1)genotypesonthetolerancetolowphosphorusen2vironment1ActaAgriculturaeUniversitatisJiangxiensis(),2000,22(2):162