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The chili pepper CaATL1: an AT-hook motif-containing transcriptionfactor implicated in defence responses against pathogens
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 Authours
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Soo-Yong Kim, Young-Cheol Kim, Eun Soo Seong, Yong-Hwan Lee, Jeong Mee Park, and Doil Choi |
| Title |
The chili pepper CaATL1: an AT-hook motif-containing transcriptionfactor implicated in defence responses against pathogens |
| Journal |
Molecular Plant Pathology, 2007 (8) ~ |
Abstract
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Using cDNA microarray analysis, we isolated a cDNA clone,
CaATL1 (Capsicum annuum L. Bukang AT-hook-Like gene 1),
from a chili pepper plant incompatibly interacting with bacterial
pathogens. The deduced amino acid sequence has a potential
nuclear localization sequence and an AT-hook DNA binding motif
which can bind AT-rich sequence elements. Expression of CaATL1
was specifically induced in host- and non-host-resistant responses
against bacterial and viral pathogens in pepper plants. In addition,
CaATL1 transcripts also increased following salicylic acid
and ethephone treatment but were only mildly induced by
methyl-jasmonate treatment. CaATL1::smGFP (soluble-modified
green fluorescent protein) fusion protein localized to nuclei in
tobacco BY2 protoplasts. The C-terminal region of the CaATL1
protein fused to the LexA DNA binding domain was able to
activate reporter gene expression in yeast. To analyse further the
role of the CaATL1 in pathogen defence response, we generated
CaATL1-over-expressing transgenic tomato plants. These transgenic
plants showed enhanced disease resistance against
bacterial and oomycete pathogens. Taken together, these results
provide the first evidence of a role for a plant AT-hook motifcontaining
transcription factor in pathogen defence response. |
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