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Evidence Against Genetic Self-Incompatibility in the Homosporous Fern Pteridium aquilinum

Edward J. Klekowski, Jr.
Evolution
Vol. 26, No. 1 (Mar., 1972), pp. 66-73
DOI: 10.2307/2406983
Stable URL: http://www.jstor.org/stable/2406983
Page Count: 8
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Evidence Against Genetic Self-Incompatibility in the Homosporous Fern Pteridium aquilinum
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Abstract

Five varieties of the fern Pteridium aquilinum tested lack a genetic self-incompatibility system. Most of the sporophytes studied gave evidence indicating that they were heterozygous for recessive sporophytic lethals. The sporophytes with the highest frequencies of lethals came from areas where Pteridium is an aggressive weed. The sporophytes with the lowest levels of lethals came from the Galapagos Islands. The latter data indicated that these islands were initially colonized by homozygous sporophytes developing from self-compatible gametophytes.

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