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Plant and Cell Physiology Advance Access published online on March 31, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci099
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received February 10, 2005
Accepted March 28, 2005

Short Communication

Acetylation of a Fucosyl Residue at the Reducing End of Mesorhizobium loti Nod Factors Is Not Essential for Nodulation of Lotus japonicus

Satoshi Shibata 1, Hisayuki Mitsui 2, and Hiroshi Kouchi 1*

1 Department of Plant Physiology, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, 305-8602, Japan
2 Graduate School of Life Sciences, Tohoku University, Aoba-ku, Sendai-shi, Miyagi, 980-8577, Japan

* To whom correspondence should be addressed.
Hiroshi Kouchi, E-mail: kouchih{at}nias.affrc.go.jp


  Abstract

NodMl-V(C18:1,Me,Cb,AcFuc) is a major component of lipo-chitin oligosaccharides (LCOs), or Nod factors, produced by Mesorhizobium loti. The presence of a 4-O-acetylated fucosyl residue (AcFuc) at the reducing end has been thought to be essential for symbiotic interactions with the compatible host plant, Lotus japonicus. We generated an M. loti mutant in which the nolL gene is disrupted; nolL has been shown to encode acetyltransferase that is responsible for acetylation of the fucosyl residue. The nolL disruptant Ml107 produced LCOs that lacked acetylation of fucosyl residues as expected, but exhibited nodulation performance on L. japonicus as efficiently as the wild type M. loti strain MAFF303099. We show that LCO without acetylation of a fucosyl residue purified from the Ml107 are also able to induce abundant root hair deformation and nodule primordium formation. These results indicate that NolL-dependent acetylation of a fucosyl residue at the reducing end of M. loti LCOs is not essential for nodulation of L. japonicus.


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