The fragrance (fgr) gene in natural populations of wild rice (Oryza rufipogon Griff.) |
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Authors: | Preecha Prathepha |
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Institution: | (1) Department of Biotechnology, Mahasarakham University, Main Road, Muang District, Mahasarakham, 44000, Thailand |
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Abstract: | The Asian cultivated rice, Oryza sativa L. (spp. indica or japonica), is assumed to have originated from one or both of the two wild Asian species, O. rufipogon Griff. and O. nivara Sharma and Shastry. They occur throughout the monsoon Asia and west Oceania. Fragrance is the most important trait among
the domesticated characters of basmati and jasmine rice of Asia. The gene for fragrance in a scented rice shows the presence
of a mutated portion (i.e., an eight base pair deletion in exon 7) that result in its loss of fragrance. In the present study,
229 wild rice O. rufipogon accessions were genotyped for this locus using a PCR assay. The wild rice species contained the mutated allele of the fgr
gene at a low frequencies of 0.23. The surveyed populations were in Hardy–Weinberg equilibrium. This observation supports
the hypothesis that the allele for fragrance was already present in the wild rice, and that this trait appeared in scented
rice cultivars because of selection by the farmers of genotypes possessing this character during the process of domestication. |
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Keywords: | Aromatic rice Fragrance gene Oryza rufipogon Rice domestication Wild rice |
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