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- W3149964705 abstract "Cross-incompatibility genes known as game- tophyte factors (ga) are numerous in maize. Many popcorn strains carry these genes and cannot be fertilized by pollen of dent and flint maize strains although the reciprocal crosses are successful. A Chinese popcorn strain SDGa25 carries the strongest allele of Ga1 (Ga1-S) and the majority of Chinese dent and flint maize germplasm are incompat- ible with SDGa25. The incompatibility is due to pollen tube growth obstruction 2 h after pollination. The pollen tube is arrested in the silk segment 5.5 cm distal to the pollination area and never reaches the ovule. The Ga1-S carried by SDGa25 behaves as a single dominant gene. This gene was mapped between markers SD3 on BAC AC200747 0.827 cM apart on the telomere side and SD12 on BAC AC204382 0.709 cM apart on the centromere side. The genetic region mapped spanning the Ga1-S locus was estimated to be 1.5 cM in length and the physical distance is 2,056,343 bp on ctg156 based on the B73 RefGen_v2 sequence. Gametophyte factors influence gene flow direc- tion and the strongest Ga1-S allele is useful for isolating one category of commercial varieties from another. The eight tightly linked markers to Ga1-S developed in this study would greatly improve marker-assisted introgression efficiency and the fine mapping would facilitate the isola- tion of the Ga1-S." @default.
- W3149964705 created "2021-04-13" @default.
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- W3149964705 date "2011-01-01" @default.
- W3149964705 modified "2023-09-27" @default.
- W3149964705 title "Genetic analysis and fine mapping of the Ga1-S gene region conferring cross-incompatibility in maize" @default.
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