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Published on March 13, 2009; 10.1104/pp.109.135269

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Received January 5, 2009
Accepted March 9, 2009

The Arabidopsis RING Finger E3 ligase RHA2a Is a Novel Positive Regulator of ABA Signaling During Seed Germination and Early Seedling Development

Qingyun Bu , Hongmei Li , Qingzhen Zhao , Hongling Jiang , Qingzhe Zhai , Jie Zhang , Xiaoyan Wu , Jiaqiang Sun , Qi Xie , Daowen Wang , and Chuanyou Li *

State Key Laboratory of Plant Genomics, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; Graduate School of Chinese Academy of Sciences, Beijing 100039, China; State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China

* Corresponding author; email: cyli{at}genetics.ac.cn.

The phytohormone abscisic acid (ABA) is well known for its regulatory roles in integrating environmental constraints with the developmental programs of plants. Here, we characterize the biological function of the Arabidopsis RING-H2 protein RHA2a in ABA signaling. The rha2a mutant is less sensitive to ABA than wild type during seed germination and early seedling development, whereas transgenic plants overexpressing RHA2a are hypersensitive, indicating that RHA2a positively regulates ABA-mediated control of seed germination and early seedling development. Double mutant analyses of rha2a with several known ABA-insensitive mutants suggest that the action of RHA2a in ABA signaling is independent of that of the transcription factors ABI3, ABI4 and ABI5. We provide evidence showing that RHA2a also positively regulates plant responses to salt and osmotic stresses during seed germination and early seedling development. RHA2a is a functional E3 ubiquitin ligase and its conserved RING domain is likely important for the biological function of RHA2a in ABA signaling. Together, these results suggest that the E3 ligase RHA2a is an important regulator of ABA signaling during seed germination and early seedling development.






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