Modern Methods in Orchid Conservation by H. W. Pritchard

By H. W. Pritchard

The subject material of this article is convention established and bargains with the body structure, ecology and administration of orchid conservation. It deals details not just to the orchid examine scientist, but in addition to the orchid fanatic keen on the medical historical past to this subject. curiosity and help for plant conservation has elevated significantly and loads of recognition has been fascinated with the plight of contributors of the orchid relations. the improvement makes it fascinating to assemble current details and to think about components of study.

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1974). Orchids from seed, a new basal medium. , 82, 179-83. A. J. (1975). On the cause of seed deterioration in dry storage. Seed Sci. TechnoL, 3, 761-74. Weismeyer, H. V. (1974). Electron microscopy of orchid seedlings. In First Symposium on the Scientific Aspects of Orchids, ed. H. Szmant & J. Wemple, pp. 16-26. Southfield, Michigan: University of Detroit. D. A. MARLOW Asymbiotic germination of epiphytic and terrestrial orchids Introduction The application of in vitro techniques to the propagation of plants at Kew originated from Dr Peter Thompson's work in the 1960s on the formulation of a medium for orchid seed germination.

Pritchard (1984; 1985) indicated the importance of seed moisture content on seed longevity. It is therefore possible that at least some of the reported variation in longevity of orchid seeds could be due to storage at different moisture contents, and/or storage at different temperatures. Although C. aurantiaca seed was stored successfully at -18 °Cfor up to one year, this was the least favourable storage temperature at the three seed moisture contents examined. This observation was in contrast to those of other workers, who found that sub-zero temperatures were beneficial for the storage of seed as long as seed moisture contents were not sufficiently high to allow the formation of ice crystals.

However, Humphreys (1960) stated that, in general, orchid seeds lost their viability within nine months. Brummitt (1962) found that Cypripedium seed lost its viability within two months, and Lindquist (1965) that the seed of Disa uniflora lost Figure 7. Serial sections A-K, taken transversely through one seed of Cattleya aurantiaca. Testa not shown. Seed viability 27 its viability in less than one month. Knudson (1940) reported considerable variation in percentage germination after seed had been stored for between seven and fourteen years.

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