Document Detail

Characterization of the grain-specific lipid transfer protein TdPR61 from wheat, and its promoter activity in wheat, barley, and rice.
MedLine Citation:
PMID:  22213809     Owner:  NLM     Status:  Publisher    
The TaPR61 gene from bread wheat encodes a lipid transfer protein (LTP) with a hydrophobic signal peptide, predicted to direct the TaPR61 protein to the apoplast. Modelling of TaPR61 revealed the presence of an internal cavity which can accommodate at least two lipid molecules. The full-length gene, including the promoter sequence of a TaPR61 orthologue, was cloned from a BAC library of Triticum durum. Quantitative RT-PCR analysis revealed the presence of TaPR61 and TdPR61 mainly in grain. A transcriptional TdPR61 promoter-GUS fusion was stably transformed into wheat, barley, and rice. The strongest GUS expression in all three plants was found in the endosperm transfer cells, the embryo surrounding region (ESR), and in the embryo. The promoter is strong and has similar but not identical spatial patterns of activity in wheat, barley, and rice. These results suggest that the TdPR61 promoter will be a useful tool for improving grain quality by manipulating the quality and quantity of nutrient/lipid uptake to the endosperm and embryo. Mapping of regions important for the promoter function using transient expression assays in developing embryos resulted in the identification of two segments important for promoter activation in embryos. The putative cis-elements from the distal segment were used as bait in a yeast 1-hybrid (Y1H) screen of a cDNA library prepared from the liquid part of the wheat multinucleate syncytium. A transcription factor isolated in the screen is similar to BES1/BLZ1 from Arabidopsis, which is known to be a key transcriptional regulator of the brassinosteroid signalling pathway.
Nataliya Kovalchuk; Jessica Smith; Natalia Bazanova; Tatiana Pyvovarenko; Rohan Singh; Neil Shirley; Ainur Ismagul; Alexander Johnson; Andrew S Milligan; Maria Hrmova; Peter Langridge; Sergiy Lopato
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-2
Journal Detail:
Title:  Journal of experimental botany     Volume:  -     ISSN:  1460-2431     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Australian Centre for Plant Functional Genomics, University of Adelaide, Hartley Grove, Urrbrae, South Australia 5064, Australia.
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