Abstract
Uranyl acetate, a suppressor of victorin-induced electrolyte leakage in oat leaves when applied together with, or before, victorin, also suppressed victorin-induced changes in ultra-structure. Uranyl crystallized in cell walls and near the plasmalemma of vascular cells, but was excluded from the protoplasm. Fewer crystals occurred near the plasmalemma when leaves were allowed to take up uranyl and victorin simultaneously than when uranyl alone was absorbed, but deposition in cell walls was similar in the two treatments. No differences in crystal distribution were found in uranyl-treated leaves which subsequently took up either water or victorin. The most striking effect of prolonged exposure to uranyl was increased vesicular activity in the protoplasm, formation of complex concentric membranes, and tonoplast damage. Following victorin treatment, uranyl post-treatment was ineffective in suppressing electrolyte leakage or preserving normal cellular ultrastructure. More severe ultrastructural damage was found in victorintreated leaves after uranyl post-treatments than after post-treatment with water, a result of victorin-induced damage which facilitates uranyl entry into the protoplasm.
Full text
PDF
Images in this article
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Hanchey P. Suppression of victorin toxicity in oats by uranyl salts. Phytopathology. 1969 Dec;59(12):1960–1962. [PubMed] [Google Scholar]
- Luke H. H., Warmke H. E., Hanchey P. Effects of the pathotoxin victorin on ultrastructure of root and leaf tissue of Avena species. Phytopathology. 1966 Oct;56(10):1178–1183. [PubMed] [Google Scholar]
- Wheeler H., Hanchey P. Pinocytosis and membrane dilation in uranyl-treated plant roots. Science. 1971 Jan 8;171(3966):68–71. doi: 10.1126/science.171.3966.68. [DOI] [PubMed] [Google Scholar]
- Whitehead N. E., Brooks R. R., Peterson P. J. The nature of uranium occurrence in the leaves of Coprosma australis (A. Rich.) Robinson. Aust J Biol Sci. 1971 Feb;24(1):67–73. doi: 10.1071/bi9710067. [DOI] [PubMed] [Google Scholar]