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Published on December 27, 2007; 10.1104/pp.107.109009

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Received September 13, 2007
Accepted December 13, 2007

The Arabidopsis kinase-associated protein phosphatase regulates adaptation to Na+ stress

Yuzuki Manabe , Ray A. Bressan , Tao Wang , Fang Li , Hisashi Koiwa , Irina Sokolchik , Xia Li , and Albino Maggio *

Center for Plant Environmental Stress Physiology, 625 Agriculture Mall Drive, Purdue University, West Lafayette, IN 47907-2010, USA; Department of Horticultural Sciences, Texas A&M University, College Station, TX77843-2133; State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong Road, Shijiazhuang, Hebei 050021, China; Department of Agricultural Engineering and Agronomy, University of Naples Federico II, Via Universita 100, Portici 80055, Italy

* Corresponding author; email: albino.maggio{at}unina.it.

The kinase-associated protein phosphatase (KAPP) is a regulator of the receptor-like kinase (RLK) signaling pathway. Loss-of-function mutations rag1-1 (root attenuated growth1-1) and rag1-2, in the locus encoding KAPP cause NaCl hypersensitivity in Arabidopsis thaliana. The NaCl hypersensitive phenotype exhibited by rag1 seedlings includes reduced shoot and primary root growth, root tip swelling and increased lateral root formation. The phenotype exhibited by rag1-1 seedlings is associated with a specific response to Na+ toxicity. The sensitivity to Na+ is Ca2+-independent and is not due to altered intracellular K+/Na+. Analysis of the genetic interaction between rag1-1 and salt overly sensitive1 (sos1)-14 revealed that KAPP is not a component of the SOS signal transduction pathway, the only Na+ homeostasis signaling pathway identified so far in plants. All together, these results implicate KAPP as a functional component of the RLK signaling pathway, which also mediates adaptation to Na+ stress. RLK pathway components, known to be modulated by NaCl at mRNA level, are constitutively down-regulated in rag1-1 mutant plants. The effect of NaCl on their expression is not altered by the rag1-1 mutation.






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