寒地水稻秕粒形成的源庫(kù)調(diào)節(jié).pdf

1、東北農(nóng)業(yè)大學(xué)博士學(xué)位論文寒地水稻秕粒形成的源庫(kù)調(diào)節(jié)姓名：王連敏申請(qǐng)學(xué)位級(jí)別：博士專(zhuān)業(yè)：作物栽培學(xué)與耕作學(xué)指導(dǎo)教師：李文雄20000101博上論盤(pán)寒地水稻秕鞋形成的源庫(kù)調(diào)節(jié)東北農(nóng)業(yè)太學(xué)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