Journal Article

Toward Understanding the Different Function of Two Types of Parenchyma Cells in Bamboo Culms

Xin-Qiang He, Kiyoshi Suzuki, Shinichi Kitamura, Jin-Xing Lin, Ke-Ming Cui and Takao Itoh

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 2, pages 186-195
Published in print February 2002 | ISSN: 0032-0781
Published online February 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf027
Toward Understanding the Different Function of Two Types of Parenchyma Cells in Bamboo Culms

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

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The bamboo, woody monocot, has two types of parenchyma cells in the ground tissues of its culm, in contrast to a single type of parenchyma cell in rice, maize and other major crop species. The distribution of cell wall components, including lignin, (1→3), (1→4)-β-d-glucans (MGs), the highly-substituted glucuronoarabinoxylans (hsGAXs) and low-branched xylans (lbXs) in ground parenchyma tissue of Phyllostachys heterocycla var. pubescens culms was studied at various developmental stages using light microscopy (LM), UV-microscopy, transmission electron microscopy (TEM) and immunolabeling techniques. The short parenchyma cell walls were lignified in 2-month-old bamboo culms just as the long parenchyma cell walls were. The lignified regions were confined to the portions in contact with the long parenchyma cell walls, while the walls at the cell corner region never lignified, even in 7-year-old culms. Significant differences were also found in the hemicellulose distribution between the short and long parenchyma cell walls. In bamboo parenchyma tissue, MGs were localized in short parenchyma cell walls and few were found in long parenchyma cell walls in both young and 7-year-old culms. The distribution of hsGAXs was similar to that of MGs in young culms, but they only appeared in the cell corner region of short parenchyma cells in old culms. Low-branched xylans were distributed in the lignified, but not in unlignified parenchyma cell walls. Based on this evidence, the differences of function in both short and long parenchyma cells in a bamboo culm are discussed.

Keywords: Key words: (1→3), (1→4)-β-d-glucans — Glucuronoarabinoxylans — Lignification — Phyllostachys heterocycla var. pubescens — Short parenchyma cells.; Abbreviations: FAA, formaldehyde, acetic acid and alcohol mixture; hsGAXs, highly substituted glucuronoarabinoxylans; lbXs, low-branched xylans; LM, light microscopy; MG, (1→3), (1→4)-β-d-glucan; PBS, phosphate-buffered saline; TEM, transmission electron microscopy.

Journal Article.  4232 words.  Illustrated.

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

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