Table 1.

Inheritance of Elements of Gametophytic Apomixis (Apomeiosis and Parthenogenesis) in Members of the Ranunculaceae, Poaceae, and Compositae

Species	Apomeiosis Type	Family	Inferred Genotype	Most Closely Linked Molecular Marker	Evidence for Suppression Recombination	Reference
Apomeiosis
Ranunculus auricomus	Apospory	Ranunculaceae	Aaaa	–	–	Nogler, 1984b
Panicum maximum	Apospory	Poaceae	Aaaa	–	–	Savidan, 1982
Pennisetum squamulatum	Apospory	Poaceae	Aaaa	0 cM	Yes	Ozias-Akins et al.,1998
Brachiaria decumbens	Apospory	Poaceae	Aaaa	1.2 cM	?	Pessino et al., 1998
Paspalum simplex	Apospory	Poaceae	Aaaa	0 cM	Yes	Pupilli et al., 2001
Hieracium piloselloides	Apospory	Compositae	Aaa	–	–	Bicknell et al., 2000
Hieracium aurantiacum	Apospory	Compositae	Aaa	–	–	Bicknell et al., 2000
Tripsacum dactyloides	Diplospory	Poaceae	Aaaa	0 cM	Yes	Grimanelli et al., 1998a, 1998b
Erigeron annuus	Diplospory	Compositae	Aaa	0 cM	Yes	Noyes and Rieseberg, 2000
Taraxacum officinale	Diplospory	Compositae	Aaa	4.4 cM	?	van Dijk et al., unpublished
Parthenogenesis
Poa pratensis	Apospory	Poaceae	Pppp	6.6 cM	?	Barcaccia et al., 1998
Erigeron annuus	Diplospory	Compositae	Ppp	7.3 cM	No	Noyes and Rieseberg, 2000

The genetic models are based on segregation analyses of sexual × apomictic crosses and in most cases supported by cosegregation of closely linked molecular markers. No distinction is made between disomic (Aa/aa) and tetrasomic (Aaaa) inheritance. The distance between the apomixis locus and the most closely linked marker is indicated in centimorgans (cM). (–), not investigated; (?), no conclusive data.