Meiotic studies in Anemone multifida, A. tetonensis, and their hybrids

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Abstract
Anaphase I was analyzed for bridge and fragment configurations in Anemone multifida vars. multifida, hudsoniana, richardsiana, and saxicola; in intra- and inter-varietal hybrids; in A. tetonenis; and in inter-specific hybrids. Indirect evidence indicated that most bridges and fragments arose from chiasma formation in paracentric inversions rather than from other types of meiotic breakage and reunion events. Variety saxicola differed from other varieties of A. multifida in the low fertility it conferred on its inter-varietal hybrids. Reduced fertility was not due to chromosome structural differences and therefore must reflect other undefined genetic barriers. Hybrids of A. tetonensis with any A. multifida variety tested also had low fertility. This could in large part be accounted for by demonstrated inversion heterozygosity. However, the operation of additional fertility barriers is not excluded.

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