AI Article Synopsis
- Distorted segregation of the brittle culm-1 gene (bc1) was observed in inter-subspecific hybrids of rice, deviating from the expected Mendelian inheritance pattern seen in intra-subspecific hybrids.
- In a study involving various crosses, different generations showed fluctuating frequencies of the bc1 bc1 genotype, with some hybrids exhibiting increased or decreased occurrences in F1, F2, F3, and F4 generations.
- The research suggested that this distortion in segregation is linked to selective fertilization of male gametes, regulated by gametophyte genes located on chromosome 3.
Article Abstract
Distorted segregation of the brittle culm-1 gene (bc1) on rice chromosome 3 was found with greatly increased or decreased frequency of bc1 bc1 genotype in inter-subspecific hybrids, although the gene normally transmitted to its offspring following the Mendelian Law in intra-subspecific hybrids. In a combination of Kamairazu//Ketan Nangka/Kamairazu,an increased frequency of bc1 bc1 in F1, normal segregation in F2, and increased and decreased frequency in a few F3 and F4 lines were observed. In a cross of IR36/Kamairazu, decreased frequency in F2, both normal and decreased segregations in F3 and F4, and a few lines of increased ratio in F4 were found. In F2 of Ketan Nangka/IR36//Kamairazu, increased and decreased and normal segregations were all observed. There was no significant correlation between the frequency of bc1 bc1 and pollen fertility. It implied that distorted segregation of bc1 was caused by selective fertilization of male gametes, which were governed by gametophyte genes of ga2, ga3 and ga14 on chromosome 3.
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