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Morphological responses of Betula protoplasts in fiber spinning
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Tomoko Seyama
Published/Copyright:
September 30, 2011
Abstract
In a previous article, it was reported that, under stress conditions caused by Ca2+ ions, isolated protoplasts of Betula platyphylla leaves release a bundle of hollow fibrils as a stress-induced response. In the present article, details of this phenomenon have been investigated. As a special method, light microscopy combined with a ‘through focus variation’ technique was applied. In a regular culture medium, protoplasts could regenerate the cell walls, whereas protoplasts submitted to Ca2+ stress could not. Under stress conditions, the protoplasts inflated and formed a huge vacuole and, after 28 days, secreted the peculiar gigantic fibril with a diameter of 150 μm. The giant fibril is composed of (1→3)-β-glucan chains, i.e., the material of callose tissue.
Keywords: inhibited cell wall formation; macrofibril formation; morphological responses to stress; protoplast of Betula platyphylla; stressed culture condition
Received: 2011-3-22
Accepted: 2011-9-1
Published Online: 2011-09-30
Published in Print: 2012-03-01
©2012 by Walter de Gruyter Berlin Boston
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