Parker, M.L. (1979) Morphology and ultrastructure of the gravity-sensitive leaf sheath base of the grass Echinochloa colonum L. Planta, 145 (5). pp. 471-477.
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Abstract
When a flowering stalk of E. colonum was held horizontally, growth was initiated in the lower side of each leaf sheath base, restoring the inflorescence to an upright position. Changes in the gravity vector were perceived by specialized statolith-containing tissue which was associated with each of the symmetrically-arranged vascular bundles within the leaf sheath bases. The morphological and ultrastructural features of these gravity-sensitive regions were examined by light and electron microscopy. Each statocyte cell contained a large central vacuole with a thin lining of cytoplasm. Up to 50 spherical starch statoliths lay along the lowermost side of the cells and these sedimented readily following geotropic stimulation. Statoliths were found in contact with the plasmalemma, or might be prevented from touching it by bands of microtubules. Dictyosomes and mitochondria were numerous, but endoplasmic reticulum was sparse. The nuclei tended to remain at the original apex of each cell. Statocytes of the leaf sheath base were compared and contrasted with those of the root tip
| Item Type: | Article |
|---|---|
| Author Affiliation: | Plant Breeding Institute, Cambridge CB3 0DY, UK |
| Subjects: | Plant Physiology and Biochemistry > Plant Physiology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Other Crops |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 08 May 2012 08:02 |
| Last Modified: | 08 May 2012 08:02 |
| Official URL: | http://dx.doi.org/10.1007/BF00380102 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5170 |
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