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- Title
Wall extensibility and gravitropic curvature of sunflower hypocotyls: correlation between timing of curvature and changes in extensibility.
- Authors
Bagshaw, S. L.; Cleland, R. E.
- Abstract
Gravitropic curvature results from unequal growth rates on the upper and lower sides of horizontal stems. These unequal growth rates could be due to differences in wall extensibility between the two sides. To test this, the time course of curvature of horizontal sunflower (<em>Helianthus annuus</em> L.) hypocotyls was determined and compared with the time courses of changes in Instron-measured wall extensibility (PEx) of the upper and lower epidermal layers. As gravicurvature developed, so did the difference in PEx between the upper and lower epidermis. The enhanced growth rate on the lower side during the period of maximum increase in curvature was matched by PEx values greater than those of We vertical control, while the inhibited growth rate on the upper side was accompanied by PEx values below that of the control. The close correlation between changes in growth rates and alterations in PEx demonstrates that changes in wall extensibility play a major rote in controlling gravicurvature.
- Subjects
GROWTH rate; SUNFLOWERS; PLANT growth; PLANT stems; EPIDERMIS; PLANT plasma membranes; PLANTS
- Publication
Plant, Cell & Environment, 1990, Vol 13, Issue 1, p85
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.1990.tb01303.x