简介：

简介：在中国在商业杂交稻生产推广的41根父母线的基因差异被使用词法特点和简单顺序重复(SSR)的簇分析学习标记。41个条目被分配进二簇(即早成熟ormedium簇；中等或迟了成熟的簇)并且进一步在词法特点簇分析上分配了sub-clustersbased进六。早或中等成熟的簇是镇静的of15维护者线，四根早成熟的恢复系线和二个thermo敏感的妖怪不育系，并且中等或迟了成熟的簇包括了成熟orlate维护者衬里的16根restorer线和4媒介。而且，SSR簇分析分类41条目intotwogroups(即维护者线组和恢复系线组)并且七亚群。维护者线组由所有19根维护者线组成了，二个thermo敏感的妖怪不育系，当restorer线组由所有构成时，20restorer排队。与家谱信息更好适合的SSR分析。从杂交稻繁殖上的看法，结果建议thatSSR分析可能是一个更好的方法在indica杂交稻学习父母线的差异。

简介：Amajorprobleminhybridriceproductionistheoccurrenceofleafsenescenceduringthegrainfillingstagethatcanresultinreductionofyield.Changesincontentsofseveralendogenoushormonesarerelatedtoleafsenescence.TherelationshipbetweenendogenoushormonesandleafsenescenceinthericehybridTiyou418anditsparentsTijinandC418,wasundertakenforinvestigation.Indicatorsofleafsenescence,includingsuperoxidedismutase(SOD)activity,malondialdehyde(MDA)accumulationandchlorophyllcontent,aswellasthecontentsofabscisicacid(ABA),zeatinriboside(ZR),gibberellin(GA1/3)andauxin(IAA)intheleavesweredetermined.Differentratesofleafsenescencewereobservedinthethreematerials.SenescenceoccurredearliestandfastestinTijin,followedbyTiyou418andthenC418.AsimilartrendwasrecordedinABA,ZR,andIAAcontentsduringthegrainfillingstageinthethreematerials.Changesin(GA1/3+ZR+IAA)/ABAratioswerealsosimilar,beingquitestableduringtheearlystageofleafsenescence,anddecreasingmarkedlyduringthelatestage.TheratiodeclinedmoredramaticallyinTijin,inaccordancewithitsfasterleafsenescence.Theresultssuggestthattheratioof(GA1/3+ZR+IAA)/ABAregulateschlorophyllcontent,SODactivity,MDAcontentandmembranelipidperoxidation.Itispostulatedthatendogenoushormonesmayplayaroleintheregulationofleafsenescenceinasystematicway.