Journal Article

Bacterial Lipopolysaccharides Induce Defense Responses Associated with Programmed Cell Death in Rice Cells

Yoshitake Desaki, Ayako Miya, Balakrishnan Venkatesh, Shinji Tsuyumu, Hisakazu Yamane, Hanae Kaku, Eiichi Minami and Naoto Shibuya

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 11, pages 1530-1540
Published in print November 2006 | ISSN: 0032-0781
Published online November 2006 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcl019
Bacterial Lipopolysaccharides Induce Defense Responses Associated with Programmed Cell Death in Rice Cells

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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PAMP (pathogen-associated molecular pattern) recognition plays an important role during the innate immune response in both plants and animals. Lipopolysaccharides (LPS) derived from Gram-negative bacteria are representative of typical PAMP molecules and have been reported to induce defense-related responses, including the suppression of the hypersensitive response, the expression of defense genes and systemic resistance in plants. However, the details regarding the precise molecular mechanisms underlying these cellular responses, such as the molecular machinery involved in the perception and transduction of LPS molecules, remain largely unknown. Furthermore, the biological activities of LPS on plants have so far been reported only in dicots and no information is thus available regarding their functions in monocots. In our current study, we report that LPS preparations for various becteria, including plant pathogens and non-pathogens, can induce defense responses in rice cells, including reactive oxygen generation and defense gene expression. In addition, global analysis of gene expression induced by two PAMPs, LPS and chitin oligosaccharide, also reveals a close correlation between the gene responses induced by these factors. This indicates that there is a convergence of signaling cascades downstream of their corresponding receptors. Furthermore, we show that the defense responses induced by LPS in the rice cells are associated with programmed cell death (PCD), which is a finding that has not been previously reported for the functional role of these molecules in plant cells. Interestingly, PCD induction by the LPS was not detected in cultured Arabidopsis thaliana cells.

Keywords: Defense response; Elicitor; Lipopolysaccharide; PAMPs; Programmed cell death; Rice

Journal Article.  6278 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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