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Localization of actin filaments and cortical microtubules in wood-forming tissues of conifers

In: IAWA Journal
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Shahanara Begum Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu-Tokyo 183-8509, Japan.
Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

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Osamu Furusawa Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.

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Masaki Shibagaki Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.

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Satoshi Nakaba Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu-Tokyo 183-8509, Japan.

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Yusuke Yamagishi Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu-Tokyo 183-8509, Japan.
Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.

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Joto Yoshimoto Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu-Tokyo 183-8509, Japan.

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Md Hasnat Rahman Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu-Tokyo 183-8509, Japan.
Institute of Global Innovation Research, Tokyo University of Agriculture and Technology, Fuchu-Tokyo 183-8538, Japan.

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Yuzou Sano Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.

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Ryo Funada Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu-Tokyo 183-8509, Japan.

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ABSTRACT

The aim of the present study was to investigate the orientation and localization of actin filaments and cortical microtubules in wood-forming tissues in conifers to understand wood formation. Small blocks were collected from the main stems of Abies firma, Pinus densiflora, and Taxus cuspidata during active seasons of the cambium. Bundles of actin filaments were oriented axially or longitudinally relative to the cell axis in fusiform and ray cambial cells. In differentiating tracheids, actin filaments were oriented longitudinally relative to the cell axis during primary and secondary wall formation. In contrast, the orientation of well-ordered cortical microtubules in tracheids changed from transverse to longitudinal during secondary wall formation. There was no clear relationship between the orientation of actin filaments and cortical microtubules in cambial cells and cambial derivatives. Aggregates of actin filaments and a circular band of cortical microtubules were localized around bordered pits and cross-field pits in differentiating tracheids. In addition, rope-like bands of actin filaments were observed during the formation of helical thickenings at the final stage of formation of secondary walls in tracheids. Actin filaments might not play a major role in changes in the orientation of cortical microtubules in wood-forming tissues. However, since actin filaments were co-localized with cortical microtubules during the formation of bordered pits, cross-field pits and helical thickenings at the final stage of formation of the secondary wall in tracheids, it seems plausible that actin filaments might be closely related to the localization of cortical microtubules during the development of these modifications of wood structure.

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