Abstract：
:Plants have evolved intricate mechanisms to respond and adapt to a wide variety of biotic and abiotic stresses in their environment. The Arabidopsis DEAR1 (DREB and EAR motif protein 1; At3g50260) gene encodes a protein containing significant homology to the DREB1/CBF (dehydration-responsive element binding protein 1/C-repeat binding factor) domain and the EAR (ethylene response factor-associated amphiphilic repression) motif. We show here that DEAR1 mRNA accumulates in response to both pathogen infection and cold treatment. Transgenic Arabidopsis overexpressing DEAR1 (DEAR1ox) showed a dwarf phenotype and lesion-like cell death, together with constitutive expression of PR genes and accumulation of salicylic acid. DEAR1ox also showed more limited P. syringae pathogen growth compared to wild-type, consistent with an activated defense phenotype. In addition, transient expression experiments revealed that the DEAR1 protein represses DRE/CRT (dehydration-responsive element/C-repeat)-dependent transcription, which is regulated by low temperature. Furthermore, the induction of DREB1/CBF family genes by cold treatment was suppressed in DEAR1ox, leading to a reduction in freezing tolerance. These results suggest that DEAR1 has an upstream regulatory role in mediating crosstalk between signaling pathways for biotic and abiotic stress responses.
journal_name
J Plant Resjournal_title
Journal of plant researchauthors
Tsutsui T,Kato W,Asada Y,Sako K,Sato T,Sonoda Y,Kidokoro S,Yamaguchi-Shinozaki K,Tamaoki M,Arakawa K,Ichikawa T,Nakazawa M,Seki M,Shinozaki K,Matsui M,Ikeda A,Yamaguchi Jdoi
10.1007/s10265-009-0252-6subject
Has Abstractpub_date
2009-11-01 00:00:00pages
633-43issue
6eissn
0918-9440issn
1618-0860journal_volume
122pub_type
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