Abstract
The recessive fgr gene on chromosome 8 is associated with rice fragrance. It has been reported that this gene is a non-functional badh2 allele and that the functional Badh2 allele encoding putative betaine aldehyde dehydrogenase (BADH2) could render rice non-fragrant. Here we report the discovery of a new badh2 allele and the development of functional markers for the badh2 locus. A total of 24 fragrant and ten non-fragrant rice varieties were studied and sequenced for their Badh2/badh2 loci. Of the 24 fragrant rice varieties, 12 were found to have the known badh2 allele (badh2-E7), which has an 8-bp deletion and three single nucleotide polymorphisms (SNPs) in exon 7; the others had a novel null badh2 allele (badh2-E2), which has a sequence identical to that of the Badh2 allele in exon 7, but with a 7-bp deletion in exon 2. Both null badh2 alleles are responsible for rice fragrance. Based on sequence divergence amongst the functional Badh2 and two null badh2 alleles, we developed functional markers which can be easily used to distinguish non-fragrant from fragrant rice and to differentiate between two kinds of fragrant rice. These functional markers will find their usefulness in breeding for fragrant rice varieties via marker-assisted selection.
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Abbreviations
- 2AP:
-
2-Acetyl-1-pyrroline
- BADH:
-
Betaine aldehyde dehydrogenase
- QTL:
-
Quantitative trait locus
- SNP:
-
Single nucleotide polymorphism
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Acknowledgements
The authors thank Prof. Jufei Lu for his assistance in the field testing, Prof. Xin Li and Prof. ShuZhu Tang for their help in collecting rice varieties, Ms. Qing Chao, Chunxia Liu, and Lu Jiang for their technical assistance. This research was financially supported by the National High-Tech ‘863’ Program of P.R. China (Grant No. 2002AA224041) and the National Natural Science Foundation of China (Grant No. 30771318).
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Weiwei Shi and Yi Yang contributed equally to this work.
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Shi, W., Yang, Y., Chen, S. et al. Discovery of a new fragrance allele and the development of functional markers for the breeding of fragrant rice varieties . Mol Breeding 22, 185–192 (2008). https://doi.org/10.1007/s11032-008-9165-7
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DOI: https://doi.org/10.1007/s11032-008-9165-7