The Rice Grain Trait Of Fenetic Research

This research mainly adopts the rice of difference grain size for a big grain of rice(31C122), a long grain of rice(Fuyu333)and two small grain of rice(Xiaolidao、 B674)for parent material, configuration combinations for31C122/Xiaolidao、 Xiaolidao/31C122,31C122/B674, B764/31C122,31C122/Fuyu333, to research the filial generation of grain characters genetic analysis, that main research results as follows:(1) The various grain traits of the parents and the F1numerical relatively uniform, F1of the various grain traits were between the parents and close to average parents, explain the parents have the similar genetic contribution to the various characters, expression for no completely dominant; But the grain length of31C122/Fuyu333less than the parents, expression for beyond parents phenomenon; The grain length of31C122with Xiaolidao reciprocal cross combinations of genetic is slightly short, and then the grain wide of31C122/Fuyu333of genetic is slightly narrower, expression for not dominant.(2)31C122with Xiaolidao reciprocal cross combinations in F2population grain length control by a pair major gene and other minor gene, major genes no dominant effect;31C122with B674reciprocal cross and31C122/Fuyu333in F2population control by a pair major gene and other minor gene. Every cross combination of the grain length expression comes out varying degrees of beyond parents phenomenon.(3)31C122with Xiaolidao reciprocal cross combinations of F2population the narrow grain of genes for wide grain of gene is dominant, grain wide control by a pair of major gene and other minor gene;31C122with B674reciprocal cross combinations and31C122/Fuyu333of F2population grain width were normal distribution, Performance for quantitative character genetic, may be the genetic mechanism is more complicated.(4) The various combinations of F2population grain thickness were performance for normal distribution, may be the genetic mechanism is more complicated. 31C122/B674of the grain thickness expression comes out beyond parents and negative beyond parents phenomenon.(5) The various combinations of F2population length/width were performance for normal distribution, the genetic mechanism is more complicated, may be the common function for the grain length and grain width; The length/width of31C122with Xiaolidoa reciprocal cross combinations and B674/31C122expression comes out beyond parents and negative beyond parents phenomenon,31C122/B674and31C122/Fuyu333expression comes out beyond parents phenomenon.(6)The various combinations of F2population1000-grain weight of low genes for the1000-grain weight of high gene is dominant, the1000-grain weight control by a pair of major gene and other minor gene;31C122with B674reciprocal cross combinations and31C122/Fuyu333expression comes out beyond parents phenomenon.(7) The F2population of grain traits between genetic of the relevant analysis shows that, length for each grain had a positive effect; The grain width for grain thickness and1000-grain weight had a positive effect, and for the length/width have a negative influence; The grain thickness and length/width for the1000-grain weight had a positive effect.