Abstract
FOR more than a hundred years there have been conflicting statements regarding sex-determination in Equisetum. In the earliest accounts, the prothalli were described as unisexual. Later, it became accepted that archegoniate prothalli were also capable of bearing antheridia. Döpp1, working on fern prothalli, showed that extracts of mature prothalli hastened the onset of antheridium formation in young prothalli—and this has been confirmed by Näf2. Similar investigations should clearly be carried out on the prothalli of Equisetum; but the first requirement is to devise a technique for growing isolated prothalli in aseptic conditions in vitro.
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References
Döpp, W., Ber. deutsch. bot. Ges., 72, 11 (1950).
Näf, U., J. Linn. Soc. (Bot.), 58, 321 (1963).
Hurel-Py, G., C.R. Acad. Sci., Paris, 153, 197 (1949).
Castle, H., Bot. Gaz., 114, 323 (1953).
Whitehouse, H. L. K., Trans. Brit. Bryol. Soc., 4, 389 (1963).
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SPORNE, K. Self-fertility in a Prothallus of Equisetum telmateia, Ehr.. Nature 201, 1345–1346 (1964). https://doi.org/10.1038/2011345a0
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DOI: https://doi.org/10.1038/2011345a0
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