基于聚合改良水稻恢复系先恢207和r1005的抗性

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1、基因聚合改良水稻恢复系先恢207和R1005的抗性Abs仃actDiseasesandinsectpestarethemostimportantfactorsthataffectthericeyield，whilethericeblast,bacterialblight，brownplanthopper,leaffolder,stemborer,sheathblightarethemajordiseasesandinsectpestsinrice，whichCanleadtogreatdamageofriceyield．AccordingtothestatisticsoftheNationa

2、lAgriculturalTechnologyExtensionandServiceCenter(NATESC)，in2010and2011，themajorofricediseasesandinsectpestoccurrenceareasare88．57and95．23millionhin，respectively．Andthesediseasesandinsectpestsseriouslythreatenthericeyieldqualityanditscommercialvalue．Developmentofresistantcultivarshasbeenconsideredas

3、theimportantmethodtopreventthesediseasesandinsectpestsbymanyresearchs．ThreebacterialblightresistancegenesXa7,Xa21，Xa23andoneinsect-resistancegenecrylC木wereintrogressedintotherestorerlineXialll】晡207bybackcrossing，multicrossingandmolecularmarker-assistedselectionandpyramiding．BlastresistancegenePi9，b

4、acterialblightresistancegeneXa23，twobrownplanthopper(BPH)resistancegenesBphl4andBphl5，insect-resistancegenecrylC木wereintrogressedintorestorerlineR1005bybackcrossing，molecularmarker-assistedselectionandphenotypicselection．Theevaluationresultsofresistance，yield，growthduration，mainagronomictraitsandri

5、cequalitytraitsshowedasfollows：1．NinebredlinescarryingXa7,Xa21，Xa23，Xa7+Xa21，Xa7+Xa23，respectively,underthegeneticbackgroundofXianh_uj207wereselected．SevenstrainsofXanthomonasoryzaepv．Oryzae，PX061，PX099，ZHEl73，GDl358，FuJ，YN24andHeNl1wereinoculatedtoninebredlinesandtheirhybridcombinationswhichJin23A

6、usedasfemaleparentforidentifyingthebacterialblightresistances．TheresultsshowedthatbredlinesandhybridcombinationscarryingXa7genewereresistanttofiveXoostrains，PX061，GDl358，ZHEl73，YN24andFuJ。ThebredlineandtheirhybridcombinationcarryingXa21genewereresistanttosixXoostrains，PX061，PX099，ZHE173，GD1358，YN24

7、andFuJ．ThebredlinesandtheirhybridcombinationscarryingXa23，Xa7+Xa21，Xa7+Xa23geneswereresistanttoallofsevenXoostrains．Theresultsofyieldtrials，mainagronomictraitstestandricequalityanalysesshowedthatthreecombin