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AOBPreview originally published online on February 14, 2005
Annals of Botany 2005 95(5):863-868; doi:10.1093/aob/mci092
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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions{at}oupjournals.org

The Pattern of Distribution of Pectin, Peroxidase and Lignin in the Middle Lamella of Secondary Xylem Fibres in Alfalfa (Medicago sativa)

S. G. WI, A. P. SINGH{dagger}, K. H. LEE and Y. S. KIM*

College of Agriculture and Life Sciences, Chonnam National University, Yongbong-dong 300, Buk-gu, Gwangju, 500-757 Korea

* For correspondence. E-mail kimys{at}chonnam.ac.kr

Received: 11 September 2004    Returned for revision: 3 November 2004    Accepted: 3 January 2005    Published electronically: 14 February 2005

• Backgrounds and Aims Information on the micro-distribution of lignin within the middle lamella is only just beginning to emerge. This paper provides evidence of marked heterogeneity in the micro-distribution of lignin, pectin, peroxidase and hydrogen peroxide in the middle lamella of alfalfa (Medicago sativa).

• Methods Specimens from alfalfa stems were collected and processed for transmission electron microscopy. The middle lamella architecture was examined prior to and during lignification, using transmission electron microscopy in combination with pectin- and lignin-specific staining. In addition, immuno-gold labelling of peroxidase and cytochemical localization of hydrogen peroxide (H2O2) were undertaken.

• Key Results Lignin showed inhomogeneity in its distribution in the middle lamella. It was found that the distribution of pectin was irregular and corresponded to the pattern of deposited lignin. Additionally, a similarity in the pattern of the deposited lignin to the pattern of distribution of peroxidase and H2O2 was also observed.

• Conclusions Irregular distribution of pectin in the middle lamella may be related to subsequent inhomegeneity in lignin in this region.

Key words: Alfalfa (Medicago sativa), fibre cell wall, middle lamella, lignin inhomogeneity, pectin, hydrogen peroxide, peroxidase, immuno-gold labelling


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