Four marker genotypes related to pollen and spikelet fertility in wide crosses of rice (Oryza sativa L.)
1999
Lu, C. (Jiangsu Academy of Agricultural Sciences, Nanjing (China)) | Zou, J. | Ikehashi, H.
The purpose of this study was to determine whether gamete abortion in wide crosses can be related to spikelet or pollen fertility using marker genotypes. In a cross among the plants possessing the homozygous genotype of Pgi-1(22) on Chromosome 3, the heterozygous genotype Est-9(12) on Chromosome 7 segregated a large number of plants with pollen sterility compared with the plants with the homozygous genotype Est-9(11). Pollen fertility of the plants possessing heterozygous genotypes both at the Pgi-1 and Est-9 loci was much lower than that of plants with the homozygous genotype Pgi-1(22)/Est-9(11). In another cross using two marker genes Pgi-1 and A (Anthocyanin activator, on Chromosome 1) the plants with the heterozygous genotype Pgi-1(12) or A/A+ which were derived from two distant parents were found to segregate more pollen-sterile plants than those with the homozygous genotype Pgi-1(22) or A+/A+. Thus, Pgi-1 and A were found to be related to the fertility of pollen without any direct relation with spikelet fertility. The results implied that ga-14 (t) and ga-7 which are linked to Pgi-1 and A, respectively, may have affected the pollen fertility. The reduced pollen fertility was found to decrease the spikelet fertility in the tested crosses. In addition, spikelet fertility in the hybrids was confirmed to be related to C (Chromogen for pigmentation) on Chromosome 6. These findings should be useful for breeding such lines that show normal gamete fertility in wide crosses
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