, Volume 31, Issue 3, pp 381-387

Problems of apomictic reproduction in the FamiliesCompositae andRosaceae

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Abstract

For many years several taxa belonging to the familiesCompositae andRosaceae have been subjected to an intensive research on apomixis. These two families, together with theGramineae have headed the list of the most thoroughly examined taxonomic groups in this field. At present, new methods are being elaborated and new problems solved within the following genera known to be apomictic, viz.Antennaria, Hieracium, Taraxacum, Alchemilla, Potentilla andRubus. Many general problems still require more attention in future studies. Seven of them are considered in the present article: 1. frequency of apomixis; 2. occurrence of apospory and diplospory within one taxon; 3. nonfunctional apospory; 4. facultativeness of autonomous apomixis; 5. origin of endosperm; 6. timing of embryo and endosperm development in apomicts; 7. instability of the endosperm type. BothCompositae andRosaceae produce suitable material for such research projects.