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Content Provider | World Health Organization (WHO)-Global Index Medicus |
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Author | Meng, Yingying Li, Hongyu Wang, Qin Liu, Bin Lin, Chentao |
Description | Country affiliation: China Author Affiliation: Meng Y ( Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China.) |
Abstract | Cryptochromes are blue light receptors that regulate light responses in plants, including various crops. The molecular mechanism of plant cryptochromes has been extensively investigated in Arabidopsis thaliana, but it has not been reported in any crop species. Here, we report a study of the mechanism of soybean (Glycine max) cryptochrome2 (CRY2a). We found that CRY2a regulates leaf senescence, which is a life history trait regulated by light and photoperiods via previously unknown mechanisms. We show that CRY2a undergoes blue light-dependent interaction with the soybean basic helix-loop-helix transcription activator CIB1 (for cryptochrome-interacting bHLH1) that specifically interacts with the E-box (CANNTG) DNA sequences. Analyses of transgenic soybean plants expressing an elevated or reduced level of the CRY2a or CIB1 demonstrate that CIB1 promotes leaf senescence, whereas CRY2a suppresses leaf senescence. Results of the gene expression and molecular interaction analyses support the hypothesis that CIB1 activates transcription of senescence-associated genes, such as WRKY DNA BINDING PROTEIN53b (WRKY53b), and leaf senescence. CIB1 interacts with the E-box-containing promoter sequences of the WRKY53b chromatin, whereas photoexcited CRY2a interacts with CIB1 to inhibit its DNA binding activity. These findings argue that CIB-dependent transcriptional regulation is an evolutionarily conserved CRY-signaling mechanism in plants, and this mechanism is opted in evolution to mediate light regulation of different aspects of plant development in different plant species. |
File Format | HTM / HTML |
ISSN | 10404651 |
e-ISSN | 1531298X |
DOI | 10.1105/tpc.113.116590 |
Journal | THE PLANT CELL ONLINE |
Issue Number | 11 |
Volume Number | 25 |
Language | English |
Publisher | American Society of Plant Biologists |
Publisher Date | 2013-11-01 |
Publisher Place | United States |
Access Restriction | Open |
Subject Keyword | Discipline Botany Basic Helix-loop-helix Transcription Factors Metabolism Cryptochromes Gene Expression Regulation, Plant Physiology Soybeans Arabidopsis Proteins Genetics Chromatin Dna, Plant Molecular Sequence Data Plant Proteins Plants, Genetically Modified Yeasts Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't |
Content Type | Text |
Resource Type | Article |
Subject | Plant Science Cell Biology |
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