超大穗型水稻R1126及其组合穗颈输导组织与籽粒灌浆结实的关系.doc

超大穗型水稻R１１２６及其组合穗颈输导组织与籽粒灌浆结实 的关系 周红英　张桂莲　肖应辉　唐文邦　陈立云 (湖南农业大学水稻研究所,长沙４１０１２８;通讯联系人,EＧmail:chenliyun９９６＠１６３．com) RelationshipBetweentheConductingTissueintheFirstInternodeandthe GrainＧfillingofSuperLargePanicleRiceRestoreLineR１１２６andItsDerived Combinations ZHOUHongＧying,ZHANGGuiＧlian,XIAOYingＧhui,TANGWenＧbang,CHENLiＧyun (RiceResearchInstitute,HunanAgriculturalUniversity,Changsha４１０１２８,China;Correspondingauthor,EＧmail:chenliyun９９６ ＠１６３．com) ZHOUHongying,ZHANGGuilian,XIAOYinghui,etal．Relationshipbetweentheconductingtissueinthefirst internodeandthegrainＧfillingofsupperlargepaniclericerestorelineR１１２６anditsderivedcombinations．ChinJRice Sci,２０１４,２８(４):４１１Ｇ４１８． Abstract:Thegrainyield,thecharacteristicsofconductingtissueinthefirstinternodeandtheirrelationswiththe grainＧfillingwereanalyzedbyusingfourhybridricecombinationsderivedfromR１１２６asmaterialsandShanyou６３asa control．Theresultsshowedthatthegrainyieldofthefourhybridricecombinationswas７．４３％to２４．２３％higherthan thatofShanyou６３．Increasedtotalgrainnumberandfilledgrainnumberperpanicleattributedtoyieldincrease． ComparedwithShangyou６３,hybridricecombinationsderivedfromR１１２６hadadvantagesintheneckdiameter,area ofstemwall,rationofstemwalltocross,No．ofvascularbundles(VB),totalareaofVB,totalareaofphloem,the ratioofVBareatophloemareaaswellasconductingtissueactivity,whilehadlowerratioofspikeletnumbertoareaof VB,ratioofspikeletnumbertoareaofphloem,ratiooftotalsinktoareaofVB,ratiooftotalsinktoareaofphloem, ratiooffullgrainweighttoareaofVB,ratiooffullgrainweighttoareaofphloem,andtheorganicmaterialtransferto paniclewasfluency．ThederivedhybridricecombinationswerecharacterizedbygreaterinitialgrainＧfillingpotential (R０),maximumgrainＧfillingrate(GRmax)andmeangrainＧfillingrate(GRmean),earliermaximumgrainＧfillingrate (Tmax),shorteractivegrainＧfillingperiod(D)andeffectivegrainＧfillingtime(T９９),fastergrainfillingandreasonable fillingdynamics,smallerdＧvalueoffinalweightofakernel(A)betweensuperiorandinferiorgrains,whichcontribuＧ tedtogoodgrainＧfilling．The