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Plant and Cell Physiology Advance Access originally published online on March 31, 2005
Plant and Cell Physiology 2005 46(6):1016-1020; doi:10.1093/pcp/pci099
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JSPP © 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 Shibata1, Hisayuki Mitsui2 and Hiroshi Kouchi1,3

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

3 Corresponding author: E-mail, kouchih{at}nias.affrc.go.jp; Fax, +81-29-838-8347.

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 LCOs without acetylation of a fucosyl residue purified from 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.

(Received February 10, 2005; Accepted March 28, 2005)
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