期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 64, 期 18, 页码 5753-5767出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ert352
关键词
Arabidopsis thaliana; cortical microtubules; growth; mechanical stress; organ geometry; shoot apical meristem
资金
- INRA, France
- Ministry of Science and Higher Education, Poland
- Agence Nationale de la Recherche [ANR-10-BLAN-1516 'Mechastem']
- ERC
Cortical microtubules (CMTs) are often aligned in a particular direction in individual cells or even in groups of cells and play a central role in the definition of growth anisotropy. How the CMTs themselves are aligned is not well known, but two hypotheses have been proposed. According to the first hypothesis, CMTs align perpendicular to the maximal growth direction, and, according to the second, CMTs align parallel to the maximal stress direction. Since both hypotheses were formulated on the basis of mainly qualitative assessments, the link between CMT organization, organ geometry, and cell growth is revisited using a quantitative approach. For this purpose, CMT orientation, local curvature, and growth parameters for each cell were measured in the growing shoot apical meristem (SAM) of Arabidopsis thaliana. Using this approach, it has been shown that stable CMTs tend to be perpendicular to the direction of maximal growth in cells at the SAM periphery, but parallel in the cells at the boundary domain. When examining the local curvature of the SAM surface, no strict correlation between curvature and CMT arrangement was found, which implies that SAM geometry, and presumed geometry-derived stress distribution, is not sufficient to prescribe the CMT orientation. However, a better match between stress and CMTs was found when mechanical stress derived from differential growth was also considered.
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