RNAi-directed downregulation of OsBADH2 results in aroma (2-acetyl-1-pyrroline) production in rice (Oryza sativa L.).

Abstract:

BACKGROUND:Aromatic rice is popular worldwide because of its characteristic fragrance. Genetic studies and physical fine mapping reveal that a candidate gene (fgr/OsBADH2) homologous to betaine aldehyde dehydrogenase is responsible for aroma metabolism in fragrant rice varieties, but the direct evidence demonstrating the functions of OsBADH2 is lacking. To elucidate the physiological roles of OsBADH2, sequencing approach and RNA interference (RNAi) technique were employed to analyze allelic variation and functions of OsBADH2 gene in aroma production. Semi-quantitative, real-time reverse transcription-polymerase chain reaction (RT-PCR), as well as gas chromatography-mass spectrometry (GC-MS) were conducted to determine the expression levels of OsBADH2 and the fragrant compound in wild type and transgenic OsBADH2-RNAi repression lines, respectively. RESULTS:The results showed that multiple mutations identical to fgr allele occur in the 13 fragrant rice accessions across China; OsBADH2 is expressed constitutively, with less expression abundance in mature roots; the disrupted OsBADH2 by RNA interference leads to significantly increased 2-acetyl-1-pyrroline production. CONCLUSION:We have found that the altered expression levels of OsBADH2 gene influence aroma accumulation, and the prevalent aromatic allele probably has a single evolutionary origin.

journal_name

BMC Plant Biol

journal_title

BMC plant biology

authors

Niu X,Tang W,Huang W,Ren G,Wang Q,Luo D,Xiao Y,Yang S,Wang F,Lu BR,Gao F,Lu T,Liu Y

doi

10.1186/1471-2229-8-100

subject

Has Abstract

pub_date

2008-10-08 00:00:00

pages

100

issn

1471-2229

pii

1471-2229-8-100

journal_volume

8

pub_type

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