摘要
[目的]研究东乡野生稻渐渗系基因组结构变化及对其进行多样性分析。[方法]以东乡野生稻(O.rufipogon Griff.,供体)和栽培稻协青早B(O.sativa sp.indica Kato.,受体)构建的BC1F6渐渗群体为研究材料,利用筛选出的分布在12对染色体上的25对SSR引物对群体中的239个株系进行多态性分析。[结果]适25个微卫星位点都有东乡野生稻DNA片段不同程度的渗入,群体均大部分保留亲本协青早B或东乡野生稻的DNA序列。渐渗系基因组中平均受体纯合条带百分率为78.13%,最高达94.98%(引物为RM131),最低为60.25%(引物为RM171)。平均供体纯合条带百分率为13.37%,最高达32.64%(引物为RM171),最低为2.93%(RM1095)。群体中还存在一些杂合位点,平均杂合率为5.62%,最高达10.04%(引物为RM401)。此外,BC1F6渐渗群体中发现有双亲条带的丢失和一些双亲所没有的新条带出现,其中平均亲本条带丢失率为2.88%,最高达13.39%(引物为RM311),最低为0(引物为RM401),平均新带率为1%。高世代渐渗群体平均Nei’s基因多样性(He)和平均Shannon’s信息多样性指数(I)分别为0.276和0.457。[结论]通过远缘杂交渐渗系发生了广泛遗传与表观遗传变异,扩大了遗传变异基础,为水稻品种改良与种质创新奠定了重要基础。
[Objective] The aim of the study was to make research on genomic struc- ture variation and variety analysis of Dongxiang wild rice. [Method] Introgression groups of BC1F6 were based on donor of Oryza rufipogon Griff. and receptor of O. sativa sp. indica Kate. Strains of 239 in the group were analyzed on Polymor- phism with the help of 25 couples of SSR primers distributed in 12 pairs of chromo- somes. [Result] Gene fragments of O. rufipogon Griff. were found penetrated in the 25 microsatellite sites and most of the groups kept the parents of Xieqinzao B or DNA sequence of O. rufipogon Griff. The average rate of recurrent homozygous bands was 78.13% in the ILs, but the highest was 94.98% (amplified by primer RM131) and the lowest was 60.25% (RM171). The average rate of donor homozy- gous bands was 13.37%, but the highest was 32.64% (RM171) and the lowest was 2.93% (RM1095). There were numerous heterozygous sites in the population and the average heterozygosis rate was 5.62%, while the highest was 10.04%(RM401). Moreover, we found some parental fragments were lost and some novel fragments were not detected in either parent in BC1F6 population. The average rate of lost bands was 2.88%, while the highest was 13.39% (RM311) and the lowest was 0 (RM401). The average rate of new bands was 1%. The average of Nei's gene di- versity (He) and Shannon's Information index (I) were 0.276 and 0.457 respectively in high generation of introgression lines. [Conclusion] The study demonstrated that distant hybridization led to extensive genetic and epigenetic variations in high gener- ation of introgression lines, which expanded the base of genetic variation and laid an important foundation for rice improvement and germplasm innovation.
基金
partially supported by National Natural Science Foundation of China(30860120,30900781)
Science and Technology Projects of Jiangxi Education Department(GJJ09464)
Natural Science Foundation of Jiangxi(2008GQN0059)~~
关键词
东乡野生稻
渐渗系
SSR分析
基因组结构变化
遗传变异
Oryza rufipogon Griff.
Introgression lines
SSR analysis
Genomic structure changes
Genetic variation