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A promoter sequence involved in cell‐specific expression of the pea glutamine synthetase GS3A gene in organs of transgenic tobacco and alfalfa
Author(s) -
Brears Timothy,
Walker Elsbeth L.,
Coruzzi Gloria M.
Publication year - 1991
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/j.1365-313x.1991.00235.x
Subject(s) - biology , transgene , meristem , promoter , microbiology and biotechnology , gene , gene expression , glutamine synthetase , primordium , transcription (linguistics) , regulatory sequence , nicotiana tabacum , vascular tissue , transcription factor , genetically modified crops , cauliflower mosaic virus , genetics , botany , glutamine , linguistics , philosophy , amino acid
Summary The DMA sequence of the pea cytosolic glutamine synthetase GS3A gene promoter has been determined and the start of transcription mapped using S1 nuclease. The full‐length promoter and a series of 5′ deletions were fused to β‐glucuronidase (GUS) and introduced into transgenic tobacco and alfalfa. In transgenic tobacco the GS3A promoter directed GUS expression in the phloem cells of the vasculature in leaves, stems and roots. GUS expression was also detected in the vasculature of cotyledons and the root tips of germinating T1 seedlings. The promoter conferred a similar expression pattern in transgenic alfalfa, and expression was also observed in root nodules. Nodule expression was located in nodule primordia, as well as the meristem, symbiotic zone, and vasculature of mature nodules. The promoter was found to be active even when deleted to ‐132 relative to the start of transcription. DMA mobility‐shift analysis identified a protein present in nuclear and whole‐cell plant extracts which bound to a 17 bp DNA element contained within the minimal ‐132 promoter required for expression.