简介：Leafshapesarenotonlytheusefulindicatorsinplanttaxonomy,butalsotheimportantfactorsaffectingenergyandmaterialexchangeinleaves.Inthispaper,wecollectedandscannedtheleavesofNitrariatangutoruminDengkouofInnerMongoliaAutonomousRegion（themeanannualprecipitation145mm）andMinqinofGansuProvince（themeanannualprecipitation115mm）andN.sphaerocarpainDunhuang,andthenanalyzedleafshapeparameterswithImage-ProPlus6.0imageprocessingsoftwareandleafδ13CvaluesintheisotopelaboratoryoftheChineseAcademyofForestry.Theresultshowedthat:1)asleafareaincreasedwithincreasingwateravailabilitytheincreasesintheleaflengthandwidthwereasynchronously;2)withthesameleafwidth,the1eavesofN.tangutorumandN.sphaerocarpaweresignificantlylongerinhighwateravailableconditions;and3)althoughthereweresignificantlydifferencesinwateravailabilitybetweenDengkouandMinqin,aswellasbetweenthebottomandmiddleofthealluvialfanneartheEastLakeinDunhuang,theleafδ13CvaluesofN.tangutorumorN.sphaerocarpaweresimilarindifferentwaterconditions（P>0.05）.Ourresultssuggestedthattheratioofleafperimetertoareawouldbeanimportantfactorwhichlinkedleafshapetoplantwaterphysiology.Duringgrowingprocedureofleafarea,leaflengthincreasewaspriortoitswidthtoalleviatethereductioninratioofperimetertoareaandmaintainwateruseefficiencyoftheplant.

简介：在米饭restorer线C224的条纹疾病抵抗的继承为量的特点加多基因用主要基因的混合效果模型被分析。另外，抵抗与维护者线在C224的七个十字被调查。结果证明C224的条纹抵抗被二主要基因与添加剂优势效果(E-1模型)加多基因与additive-dominance-epistasis效果控制。这二基因有12.47%和24.75%分别地，出现的否定优势效果的添加剂效果。在二主要基因之间有重要epistasis和相互作用效果。当多基因的是2.74%时，二主要基因的可遗传性是92.12%，显示条纹抵抗有主导的主要基因效果。七个十字，五显示了高或中等的抵抗到条纹疾病。