A Lectin Receptor Kinase Positively Regulates ABA Response During Seed Germination and Is Involved in Salt and Osmotic Stress Response
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- 作者：Keqin Deng (1)
Qiming Wang (1)
Jianxin Zeng (1)
Xinhong Guo (1)
Xiaoying Zhao (1)
Dongying Tang (1)
Xuanming Liu (1) - 关键词：Abscisic acid ; Germination ; Lectin receptor kinases ; Osmotic stress
- 刊名：Journal of Plant Biology
- 出版年：2009
- 出版时间：December 2009
- 年：2009
- 卷：52
- 期：6
- 页码：493-500
- 全文大小：442KB
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Qiming Wang (1)
Jianxin Zeng (1)
Xinhong Guo (1)
Xiaoying Zhao (1)
Dongying Tang (1)
Xuanming Liu (1)
1. Bioenergy and Biomaterial Research Center, Bioscience and Biotechnology Institute, Hunan University, Changsha, 410082, China
文摘
Lectin receptor-like kinases (LecRK) are widespread in higher plants; however, little is known about their physiological roles. In this study, At1g70130 (designated LecRK-b2), an Arabidopsis LecRK gene, has been investigated. LecRK-b2 was predominantly expressed during seed germination, and its expression was ceased following germination. The expression of LecRK-b2 was induced by abscisic acid (ABA), salt, and osmotic stress. LecRK-b2 loss-of-function mutation slightly reduced the ABA sensitivity during seed germination, and this reduced sensitivity was demonstrated not due to lower ABA accumulation level in the seeds. Dual-luciferase transient expression assay confirmed that the transcription factor ABSCISIC ACID INSENSITIVE3 (ABI3) could activate the luciferase under driving of LecRK-b2 promoter. LecRK-b2 transcription level was found to be down-regulated in abi3 during seed germination. Furthermore, LecRK-b2 loss-of-function mutation reduced the salt and osmotic sensitivity during early development stage of Arabidopsis. Taken together, these results suggest that LecRK-b2 functions as a positive regulator of the ABA response during the seed germination and is involved in salt and osmotic stress response in the early development stage.