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1、第31卷第2期农业现代化研究Vol．31No．22010年3月RESEARCHOFAGRICULTURALMODERNIZATIONMar．2010杂交水稻稻米外观品质性状间相关性及遗传分析1，221雷东阳，谢放鸣，陈立云(1.湖南农业大学水稻科学研究所，湖南长沙410128；2.国际水稻研究所,菲律宾马尼拉7777信箱)摘要：用IR75589-31S、IR60、IR70和90个籼粳成分不同的株系进行不完全双列杂交，以获得的270个杂交组合为材料，对杂交稻米外观品质遗传及性状间的相关进行了研究。结果表明：垩白度、粒长、粒宽及粒长宽
2、比间的相关系数均达极显著水平，粒长、粒长宽比与垩白度呈显著负相关，粒宽与垩白度显著正相关；粒长、粒宽和粒长宽比对垩白度的直接通径系数分别为-1.9409、2.1738和2.7805。杂交稻外观品质性状主要受遗传控制且遗传效应均以加性效应为主。粒长、粒宽和粒长宽比以种子加性效应为主，母体效应也起到一定的作用，垩白度主要受到种子效应和母体效应控制，同时还受到细胞质的影响。粒长、粒宽和粒长宽比三性状的狭义遗传率都在80%以上，其中以粒宽为最高，达89.90%，垩白度的遗传率相对较低，为72.94%。关键词：杂交稻；外观品质性状；遗传；垩
3、白度；粒长；粒宽中图分类号：S331文献标识码：B文章编号：1000-0275（2010）02-0212-04GeneticandCorrelationAnalysisofGrainAppearanceQualityinHybridRice1，221LEIDong-yang,XIEFang-ming,CHENLi-yun(1.RiceResearchInstitute,HunanAgriculturalUniversity,Changsha,Hunan410128,China;2.InternationalRiceResearch
4、Institute,DAPOBox7777,MetroManila,Philippines)Abstract：Inthispaper,thegeneticandcorrelationofricegrainappearancequalitytraitsofgrainlength(GL),grainwidth(GW),grainlength/widthratio(LWR)andchalkinessdegree(CD)wasstudied.ThreefemaleincludingIR75589-31S,IR60,IR70andninet
5、yrecombinantinbredlinesoradvancedbackcrossingintrogressionlineswithdifferentindica-japonicadegreeswereusedtomakeincompletediallelcrosses.Correlationanalysesrevealeddifferentrelationshipamongthefourcharacters.CDwassignificantlyandnegativelycorrelatedwithGL(R=-0.5628**)
6、andLWR(R=-0.7498**),butpositivelycorrelatedwithGW(R=0.7539**).PathanalysisshowedthatmagnitudesofdirectionfromGL,GWandLWRtoCDwere-1.9409,2.1738and2.7805,respectively.Theresultsalsoindicatedthatallappearancequalitytraitsweremainlyinfluencedbydirectivelyadditivevariance(
7、VA)andmaternallyadditivevariance(（VAm).GL,GWandLWRwerecontrolledmainlybydirectiveeffectsandlessbymaternallyadditiveeffects.Ontheotherhand,CDwasmainlycontrolledbydirectadditiveandmaternaladditiveeffects.GL,GWandLWRhadveryhighnarrowsenseheritabilityvalues(86.03%,89.90%a
8、nd83.78%,respectively)whileCDhadrelativelylowernarrowsenseheritability(72.94%).Theresultsindicatedthattheappearancequalitytr
