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Plant Cell Advance Online Publication
Published on December 23, 2005; 10.1105/tpc.105.037713

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Received September 5, 2005
Returned for revision November 10, 2005
Accepted November 29, 2005

A Rice Glutamate Receptor-Like Gene Is Critical for the Division and Survival of Individual Cells in the Root Apical Meristem

Jing Li 1, Shihua Zhu 1, Xinwei Song 1, Yi Shen 1, Hanming Chen 1, Jie Yu 1, Keke Yi 1, Yanfen Liu 2, Valerie J. Karplus 2, Ping Wu 1*, and Xing Wang Deng 3

1 State Key Laboratory of Plant Physiology and Biochemistry, College of Life Science, Zhejiang University, Hangzhou 310029, China
2 National Institute of Biological Sciences, Zhongguancun Life Science Park, Beijing 102206, China
3 Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520-8104

* To whom correspondence should be addressed. E-mail: clspwu{at}zju.edu.cn.

Glu receptors are known to function as Glu-activated ion channels that mediate mostly excitatory neurotransmission in animals. Glu receptor-like genes have also been reported in higher plants, although their function is largely unknown. We have identified a rice (Oryza sativa) Glu receptor-like gene, designated GLR3.1, in which mutation by T-DNA insertion caused a short-root mutant phenotype. Histology and DNA synthesis analyses revealed that the mutant root meristematic activity is distorted and is accompanied by enhanced programmed cell death. Our results supply genetic evidence that a plant Glu receptor-like gene, rice GLR3.1, is essential for the maintenance of cell division and individual cell survival in the root apical meristem at the early seedling stage.






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