A Point Mutation in an F-Box Domain-Containing Protein Is Responsible for Brown Hull Phenotype in Rice-中国期刊网

摘要 Theaccumulationofpigmentsaffectsthecolorofricehullswhileonlylimitedinformationisknownaboutitsunderlyingmechanisms.Inthepresentstudy,aricebrownhull6（bh6）mutantwasisolatedfromanethanemethylsulfonate（EMS）-inducedIR64mutantbank.Brownpigmentsstartedtoaccumulateinbh6ricehullsafterheadingandreachedahigherlevelinmatureseeds.Somemajoragronomictraitsincludingpaniclelengthand1000-grainweightinbh6weresignificantlylowerthanthoseinitscorrespondingwildtypeIR64,whileotheragronomictraitssuchasplantheight,growthdurationandseed-settingratewerelargelysimilarbetweenthetwogenotypes.Theanalysisofpigmentcontentshowedthatthecontentsoftotalflavonoidsandanthocyanininbh6hullsweresignificantlyhigherthanthoseinIR64hulls.Ourresultsshowedthatthebrownhullphenotypeinbh6wascontrolledbyasinglerecessivegenewhichlocatesonthelongarmofchromosome9.Sequencinganalysisdetectedasinglebasesubstitution（G/A）atposition1013ofthecandidategene（LOCOs09g12150）encodinganF-boxdomain-containingprotein（FBX310）.Functionalcomplementationexperimentusingthewildtypeallelecanrescuethephenotypeinbh6.Thus,wenamedthismutatedgeneasOsFBX310bh6,analleleofOsFBX310functioningasaninhibitorofbrownhull.TheisolationofOsFBX310bh6anditswildtypeallelecanprovideusefulexperimentalmaterialsandwillfacilitatethestudiesonrevealingthemechanismsofflavonoidmetabolisminmonocotplants.

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A Point Mutation in an F-Box Domain-Containing Protein Is Responsible for Brown Hull Phenotype in Rice

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A Point Mutation in an F-Box Domain-Containing Protein Is Responsible for Brown Hull Phenotype in Rice

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