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Involvement of GIGANTEA gene in the regulation of the cold stress response in Arabidopsis

Involvement of GIGANTEA gene in the regulation of the cold stress response in Arabidopsis The Arabidopsis GIGANTEA ( GI ) gene has been shown to regulate several developmental processes, including photoperiod-mediated flowering, phytochrome B signaling, circadian clock, and carbohydrate metabolism. However, little is known about the role of GI gene in mediating the cold stress response. Here, we show that GI gene is involved in mediating the cold stress response. GI gene was induced by cold stress, but not by salt, mannitol, and abscisic acid. Moreover, gi-3 plants showed an increased s ensitivity to freezing stress. However, no significant differences were detected in the transcript levels of CBF genes CBF1 , CBF2 , and CBF3 as well as their targeted genes RD29A , COR15A , KIN1 , and KIN2 between wild-type and gi-3 plants in response to cold stress. These results suggest that GI gene positively regulates freezing tolerance via a CBF-independent pathway. In addition, intermittent cold treatments had a greater effect on flowering time in gi-3 plants than that in wild-type plants, suggesting that there may be a link between flowering time and cold stress response through GI in Arabidopsis . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell Reports Springer Journals

Involvement of GIGANTEA gene in the regulation of the cold stress response in Arabidopsis

Plant Cell Reports , Volume 24 (11) – Dec 1, 2005

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References (57)

Publisher
Springer Journals
Copyright
Copyright © 2005 by Springer-Verlag
Subject
Life Sciences; Plant Biochemistry; Biotechnology; Plant Sciences ; Cell Biology
ISSN
0721-7714
eISSN
1432-203X
DOI
10.1007/s00299-005-0061-x
pmid
16231185
Publisher site
See Article on Publisher Site

Abstract

The Arabidopsis GIGANTEA ( GI ) gene has been shown to regulate several developmental processes, including photoperiod-mediated flowering, phytochrome B signaling, circadian clock, and carbohydrate metabolism. However, little is known about the role of GI gene in mediating the cold stress response. Here, we show that GI gene is involved in mediating the cold stress response. GI gene was induced by cold stress, but not by salt, mannitol, and abscisic acid. Moreover, gi-3 plants showed an increased s ensitivity to freezing stress. However, no significant differences were detected in the transcript levels of CBF genes CBF1 , CBF2 , and CBF3 as well as their targeted genes RD29A , COR15A , KIN1 , and KIN2 between wild-type and gi-3 plants in response to cold stress. These results suggest that GI gene positively regulates freezing tolerance via a CBF-independent pathway. In addition, intermittent cold treatments had a greater effect on flowering time in gi-3 plants than that in wild-type plants, suggesting that there may be a link between flowering time and cold stress response through GI in Arabidopsis .

Journal

Plant Cell ReportsSpringer Journals

Published: Dec 1, 2005

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