Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 456, Issue 1, Pages 380-384Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2014.11.092
Keywords
ABA; Arabidopsis; Cold shock domain protein; Gibberellin; Seed germination
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Funding
- Japan Society for the Promotion of Science (KAKENHI) [22380063, 19380063]
- National Agriculture and Food Research Organization (NARO
- Development of Innovative Crops through the Molecular Analysis of Useful Genes) [3204]
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R013-D1-2015-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [22380063, 19380063] Funding Source: KAKEN
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The cold shock domain (CSD) is the most conserved nucleic acid binding domain and is distributed from bacteria to animals and plants. CSD proteins are RNA chaperones that destabilize RNA secondary structures to regulate stress tolerance and development. AtCSP2 is one of the four CSD proteins in Arabidopsis and is up-regulated in response to cold. Since AtCSP2 negatively regulates freezing tolerance, it was proposed to be a modulator of freezing tolerance during cold acclimation. Here, we examined the function of AtCSP2 in seed germination. We found that AtCSP2-overexpressing lines demonstrated retarded germination as compared with the wild type, with or without stress treatments. The ABA levels in AtCSP2-overexpressing seeds were higher than those in the wild type. In addition, overexpression of AtCSP2 reduced the expression of an ABA catabolic gene (CYP707A2) and gibberellin biosynthesis genes (GA20ox and GA3ox). These results suggest that AtCSP2 negatively regulates seed germination by controlling ABA and GA levels. (C) 2014 Elsevier Inc. All rights reserved.
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