简介：

简介：JohariceofAssamisaclassofricewitharoma,goodcookingqualitiesandexcellentpalatability,whicharegrownindifferentplacesofAssamwiththeiradaptabilitytolocalsituations.Atotalof143simplesequencerepeatmarkerswereusedinthisstudytorevealsufficientgeneticvariationsamongthe40Johaand14non-Joharicegenotypes.Polymorphisminformationcontentofthesemarkerswerefrom0.17to0.88,wheretheaverageof3.7alleleswereobserved.Themodel-basedpopulationassignmentanddendrogramanalysisidentifiedthreedistinctgroupsinthe54riceaccessions,whichestablishedaclearidentityofJohaaccessionsfromtheBasmatiaccessions,indicatinghighdiversityandstrongpopulationstructureinJoharice.Furthermore,atotalof29significantmarker-traitassociations(P<0.05)for10charactersweredetected.TheQTLsrelatedwithyieldandgrainqualitycanbeusedeffectivelyincropimprovementprogramsandforfurtherfinemappingandvalidationofspecificgenestodevelopgene-basedperfectmarkersinricebreedingandforminingofbetterallelesofthesegenesinJoharicecollections.

简介：Threetypicalhybridricecultivars,togetherwiththreeartificiallymodifiedplanttypesbytheapplicationofNfertilizerduringtheelongationofthetwouppermostleaveswereusedtoanalyzehowtheplanttypeaffectedthelayeredleafareaandradiationtransmission.Planttypefactors,layeredleafareaandradiationdistributionweremeasuredatthefullheading,10dand25dafterfullheadingstages,respectively.Amodelforcalculatingthelayeredleafareafromplanttypefactorswasestablishedandvalidatedtodeterminetheeffectsofplanttypefactorsonthelayeredleafareaforthethreehybrids.Furthermore,therelationshipbetweenlayeredleafareaandradiationtransmissionwasestablishedbyusingtheradiationtransmissionmodel.Theeffectsoftheplanttypefactorsontheradiationtransmissionforthethreehybridswereevaluatedbyusingthismodel.Finally,amethodwasestablishedtodescribethecanopystructure,suchasthelayeredleafareaindexandtheradiationdistributioninthericecanopy.

简介：包括landraces，本地选择，和改进变化的一套50米饭遗传型用简单顺序重复(SSR)被描绘并且内部学习的简单顺序重复(ISSR)标记基因差异和人口结构。有算术平均数的后面的未加权的对组方法基于用多态的标记的二进制数据聚类，遗传型被组织进5簇和11亚簇，而人口结构分析把50米饭遗传型分开了成5亚人口。米饭遗传型组织与遗传型的家谱信息显示出更好的相似。基因差异和人口结构分析把改进变化的多数与landraces和本地选择分开了。一些SSR标记放大了对特别遗传型特定并且能把他们与剩余的区分开来的唯一的等位基因。结果显示这些米饭遗传型展出更高基因的差异并且能在米饭改进节目很有用。

简介：从农业(USDA)米饭收集的美国部门的36个米饭条目的基因差异用103ILP(intron长度多型性)和54SSR(简单顺序重复)被估计标记。236和332等位基因的一个总数被ILP和SSR标记分别地检测。平均，SSR标记比ILP标记生产了更高的多型性信息内容价值和等位基因的数字。而Nei的基因距离测量了，使用SSR标记比用ILP标记测量了的高得多。壁炉架的测试显示有统计上重要的关联(r=0.827，P<0.001)在二个标记系统之间。基于ILP和SSR标记聚类的UPGMA导致了一致dendrograms。cophenetic关联系数(r=0.918，0.878和0.924，P<0.001为ILP，SSR和联合标记，分别地)证明高度精确的dendrogram在这些条目之中代表了基因距离。36个条目被划分成四个组。四非洲的Oryzaglaberrima就职在不同的组(I)以内被聚类，并且留下的条目被分开成三个组(II，III和IV)。所有条目能也被聚类进二个主要的组：一个人由III和IV组成，看作了indica组，并且其他人由构成我(O。glaberrima)并且II(像装饰用的梨树)。当indica组分享了混合祖先时，基于模型的簇分析表明像装饰用的梨树的组维持了很纯的祖先，特别为组III，它有七混合与组IV从19.5%～30.0%祖先分享(基于SSR标记)。ILP和SSR标记能为基因学习是很有用的并且在米饭繁殖，这被建议。

简介：Weused39SSRmarkerstoanalyzethegeneticstructureof304majorChineseinbredricevarieties,andtocomparechangesintheindicaorjaponicacomponentsinthesevarietiesthathavebeenwidelycultivatedfromthe1950stothe1990sinChina.Thegeneticstructureanalysisshowedthatthesericevarietiesweredistinctlydividedintotwopopulations,indicaandjaponica.Thesub-structureofindicavarietieswasmorecomplexthanthatofjaponicaones.Amongthevariouslines,late-seasonindicaandearlyseasonjaponicavarietieshadsimplergeneticbackgrounds.Theseasonalecotypeswerenotquiteconsistentwiththesubtypesofgeneticstructure.TwelveSSRlociwithspecificdifferentiationbetweenindicaandjaponicawereusedtocalculatetheindica/japonicacomponents.Thedifferencesinindica/japonicacomponentsamongthefivedecadeswerenotsignificant,exceptforlate-seasonindicavarietiesinthe1990s,whichhadasignificantlyhigherjaponicacomponent.TheseresultswillhelptounderstandthegeneticstructureofthemajorChineseinbredricevarietiesandwillbeusefulforindica-japonicahybridbreedinginChina.

简介：叶颜色变化是变化的一个广泛地观察的类，起在叶绿素生合成的学习的一个重要作用并且种叶绿体结构，功能，遗传和开发。自然地发生的叶颜色米饭异种，Baihuaidao7，被分析。变异的植物典型地展出了green-white-green叶颜色前进，但是这显型仅仅面对象移植那样的机械苛责导致的一个压力信号被表示。在白叶子，变异的植物生长，叶颜色，叶绿素内容，和叶绿体的外观以前，超微结构看起来与野类型的那些相同。在到白叶颜色的转换以后，变异的叶子的考试在全部的叶绿素揭示了减少，叶绿素一，叶绿素b，和类胡萝卜素内容，在叶绿体grana薄片和grana的数字的减小，和thylakoid薄片的渐渐的降级。在成熟，变异的植物与野类型的植物相比被变白并且相形见绌。基因分析显示叶异种特性被后退的原子基因控制。变异的基因的基因印射用从Baihuaidao7栠灡导出的一张F2人口被执行吗？

简介：Weedyriceexertsasevereimpactonriceproductionbycompetingforsunlight,waterandnutrients.Thisstudyassayedthepopulationstructure,geneticdiversityandoriginofNortheastAsiaweedyricebyusing48simplesequencerepeatmarkers.TheresultsshowedthatweedyriceinNortheastAsiahadahighgeneticdiversity,withShannon’sdiversityindex(I)of0.748andtheheterozygosity(He)of0.434.Ineachregionalpopulation,Ivaluevariedwidely.ThewidestrangeofI(0.228–0.489)wasobservedintheweedyriceofEasternChina,whichwaslargerthanthatofNortheastChinaandKorea(0.168–0.270).TheF-statisticsofregionalpopulations(Fis,FitandFst)alsoshowedhighervaluesintheweedyriceofEasternChinathanthoseofNortheastChinaandKorea.Allweedyriceaccessionsweregroupedintotwoclustersintheunweightedpairgroupmethodwitharithmeticmeanclusteranalysisdendrogram,namelyEasternChinabranchandNortheasternChinaplusKoreabranch.TherewassignificantdifferentiationingeneticcharacteristicsinweedyriceofnortheasternandeasternAsia,especiallyinEasternChina.