Rice Molecular Genetic Map Construction And QTL Analysis Of Traits Related To Yield In Rice

Using a F₂population containing189individiuals derived from a Japonica/Indicacross(YuZhiGuang×MingHui63), A linkage map with127SSR marker was constructed,with which QTLscontrolling heading date,plant height and1000grain weight was mapped by the software Cartgrapher2.5.All the QTL information is useful to rice genetic research and molecular breeding for the traits of headingdate,plant height and1000grain weight.The main results were described as follows:1. Total701SSR markers were used to screen the polymorphism between two parents(YuZhiGuang×MingHui63), Among167SSR markers with polymorphism,127were finally used toconstruct a genetic linkage map, using MAPMAKER/EXP3.0in a population of189lines. reconstructingvalue with Kosambi function convert from a genetic map distance (cM), It spans2123.1cM in total lengthcovering all12chromosomes, with average distance between markers of16.7cM.2. Four QTLs for heading date were detected, located on1,6,8and12chromsome, accounting for thephenotypic variation of6.4-48.0%respectively.3. Meanwhile, Four QTLs relating to plant height were detecteded on1,3,8and12chromsome,explaining6.3%²1.1%of the phenotypic variation respectively.4. Aswhile, three QTLs were detected on1,6,8chromsome for1000grain weight accounting for6.2%¹0.3%of the phenotypic variation respectively.5. QTL the ultimate purpose of this research is combine study to agronomic traits of rice, according tospecific characteristics of rice traits, take corresponding implementation route, make more quickly andeffectively for rice breeding, molecular maker assisted selection breeding provides valuable geneticinformation..