ISSN:
1615-6110
Keywords:
Angiosperms
;
Compositae
;
Calendula
;
Selfing
;
interspecific hybrids
;
speciation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Breeding experiments were carried out inCalendula species. In the annuals, which are selfers, rarely some outcrossing was observed only in the most peripheral flowers. In experimental crosses fruit was produced in all combinations. Fertile F1 and F2 hybrids could be grown from crosses between parents with similar chromosome numbers:C. palaestina ×C. pachysperma and crosses of different morphological forms ofC. arvensis. In crosses of species with different chromosome numbers at least partly fertile F1 hybrids were obtained fromC. tripterocarpa ×C. stellata andC. tripterocarpa ×C. arvensis and crosses of the latter withC. palaestina. Fertile F2 plants were grown from the combination ofC. arvensis ×C. tripterocarpa. Considering this information and previously obtained data, a scheme is proposed for explaining speciation in the genusCalendula.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00986612
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