寒地水稻秕粒形成的源庫調(diào)節(jié).pdf

1、東北農(nóng)業(yè)大學博士學位論文寒地水稻秕粒形成的源庫調(diào)節(jié)姓名：王連敏申請學位級別：博士專業(yè)：作物栽培學與耕作學指導教師：李文雄20000101博上論盤寒地水稻秕鞋形成的源庫調(diào)節(jié)東北農(nóng)業(yè)太學ABSTRACTIncoldregionthepracticeinincreasingpaniclesperunitlandiLreaandgrainsperpaniclecouldnotmeettheneedofyieldincreasingandqual

2、ityimprovinginriceproductioninthefutureMoreaUenfionshouldbepaidtoincreasethepartofplumpgrainsbecauseblightedgrain，iepoorgrainfilledgrainisthebarofyieldincreasinginriceproductionThiny—onecultivars／linesreleasedinHUprovinc

3、ewereusedinthestudiesStudiesbymeansofleafcutting，spikeletthinning，fertilizer，aswellasdensitytreatmentswerecarriedoutbothinplotandpotsinordertomakesurethesinksourcerelationandhowitplaystheroleingrain—fillingregulationinco

4、ld—regionrice“C02labelwasalsousedinthestudiesTheresultsweresummarizedasfollows：1Differenceofplumpgrainpercentagebetweencultivars／lineswasfoundTheplumpgrainpercentageineultivarswithheavypanicleishigherthanthatoflightpanic

5、leonesAnditisthesamewhencomparingthecultivarsoflatematuritywiththeearlyones2Thegrain—fillingdurationofcoldregionricecouldbefittedwellwiththeLogicgrovahequationThegrainsinearlyfloweringwerevigorousandbothmaximumanda、7erag

6、egrainfillingrateswerehigh，earlierinreachingthemaximumgrain—fillingpeak，andonlyonepeakappearedinthecureOntheopposite，themaximumandaveragegrainfillingratesoftheweakgraininlatefloweringweremuchlowerthehighestgrainfillingpe

7、akappearedlate，andtwopeakscouldbefcundinthesamecureItmeansthatthegrainfillingdurationofgrainsonlowerbranches(the2“obranchesinthestudy)wereregulatedbytheupperonesftheprimarybranches)Thegrain—fillingratebecamelowerwhenthed

8、rymat[erusedingrainfillingcouldn’tmeettheneedofhighestgrain—fillingdemandAllmentionedaboveimpliedthattheentiredurationofgrainfillingreflectedtherelationshipbetweensourceandsinkAndtheshortageofdrymanersupplyingraintilling

9、shouldbe血ekeyfactorinblightedgrainformation3Ingeneral，thegreenleafareaofriceincoldregionwasgettingdowngraduallyduringthegrainfillingperiodandthenturneddistinctlywhenthevigorousgrainreachingthehighestgrain—fillingpeakTher

10、ateofleafareadecreasingcouldbefoundbetweencultivars／linesTherateofgreenleafareadecreasewasnegativelyrelatedtoincreasethewellgrainfillinggrainpercentage(PGP)andgrainfillingdegree(OF)Therelationbetweentheratiosofleafareato

11、grainwasnegativeandsignificantlythreeweeksafterheading4ThedrymatterproductionanddistributionwereregulatedbysourcesinkstructureduringgraintiltingTheamountofdryroarerproduced，assimilatedistributedforeachgrainandtransferred