title: Gene discovery and functional marker development for fragrance in sorghum (Sorghum bicolor (L.) Moench).
abstract: Sequence analysis and genetic mapping revealed that a 1,444 bp deletion causes a premature stop codon in SbBADH2 of sorghum IS19912. The non-function of SbBADH2 is responsible for fragrance in sorghum IS19912. 2-acetyl-1-pyrroline (2AP) is a potent volatile compound causing fragrance in several plants and foods. Seeds of some varieties of rice, sorghum and soybean possess fragrance. The genes responsible for fragrance in rice and soybean are orthologs that correspond to betaine aldehyde dehydrogenase 2 (BADH2). Genotypes harboring fragrance in rice and soybean contain a premature stop codon in BADH2 which impairs the synthesis of full length functional BADH2 protein leading to the accumulation of 2AP. In this study, we reported an association between the BADH2 gene and fragrance in sorghum. An F2 population of 187 plants developed from a cross between KU630 (non-fragrant) and IS19912 (fragrant) was used. Leaves of F2 and F3 progenies were evaluated for fragrance by organoleptic test, while seeds of F2 plants were analyzed for 2AP. The tests consistently showed that the fragrance is controlled by a single recessive gene. Gene expression analysis of SbBADH1 and SbBADH2 in leaves of KU630 and IS19912 at various stages revealed that SbBADH1 and SbBADH2 were expressed in both accessions. Sequence comparison between KU630 and IS19912 revealed a continuous 1,444 bp deletion encompassing exon 12 to 15 of SbBADH2 in IS19912 which introduces a frameshift mutation and thus causes a premature stop codon. An indel marker was developed to detect polymorphism in SbBADH2. Bulk segregant and QTL analyses confirmed the association between SbBADH2 and fragrance.
authors: Program in Plant Breeding, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University, Kamphaeng Saen, Nakhon Pathom, 73140, Thailand.
authors: Chutintorn
authors: C
authors: Yundaeng
authors: Prakit
authors: P
authors: Somta
authors: Sithichoke
authors: S
authors: Tangphatsornruang
authors: Sugunya
authors: S
authors: Wongpornchai
authors: Peerasak
authors: P
authors: Srinives
mesh_terms: D000483:Alleles; D001483:Base Sequence; D020090:Chromosome Segregation / Q000235:genetics; D032461:Chromosomes, Plant / Q000235:genetics; D003433:Crosses, Genetic; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant / Q000235:genetics; D056726:Genetic Association Studies; D005819:Genetic Markers; D014644:Genetic Variation; D040582:Inheritance Patterns / Q000235:genetics; D008126:Lod Score; D008969:Molecular Sequence Data; D009812:Odorants; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D011758:Pyrroles / Q000378:metabolism; D040641:Quantitative Trait Loci / Q000235:genetics; D017384:Sequence Deletion / Q000235:genetics; D045868:Sorghum / Q000235:genetics*
chemical_list: D005819:Genetic Markers; D010940:Plant Proteins; D011758:Pyrroles; C426303:2-acetyl-1-pyrroline
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