[SSR markers linked with early stability in rice].

One hundred and thirty hybrids derived from the crosses between nine rice strains stabilized in early generation and seven cultivars (Oryza sativa L.). In their F2 populations, 32 uniform strains of different agronomic traits were observed. In the same combination of these uniform strains,there were strains segregating in the Mendelian manner. SSR markers analysis showed that F2 and F3 populations of the uniform strains and their F1 plants displayed the same markers indicating all the uniform strains were homozygous. All the marker bands of parents were simultaneously present on their progeny chromosomes, indicating that the uniform strains must true hybrid origin. The SSR markers of F2 population of segregating strains and their F1 plants showed that the segregating strains were heterzygosity. SSR marker band sites of RM276, RM258, RM248 and RM1 loci in most uniform strains presented at high frequencies bands site different from their parent's. We suggested that during the gamete formation,the genes that linked to ga-1, Rf and ga-8 mutated at certain frequency,and followed by a somatic meiosis of the fecundated zygote. Thus a haploid cell may develop into a homozygous embryo,and the F1 plant was homozygous and the progeny stabilized in early generation.