Abstract
Eighty-five chromosome numbers representing about 63 species and 23 genera are reported for African and Madagascan Loranthaceae. The base chromosome number of all genera studied is χ= 9. This chromosome number also typifies all other Old World genera of the tribe Lorantheae, and thus supports the previously suggested thesis that the Asian and African Loranthaceae are relatively closely related. Seventy-six chromosome numbers, representing three genera (Arceuthobium, Korthalsella, Viscum) and 40 species are reported for African and Madagascan Viscaceae. Most of the data are for Viscum. The number χ= 14 is suggested as the base chromosome number for both Viscum and the family as a whole. The Madagascan Visca, however, have a modal chromosome number of χ= 13. Aneuploid chromosome numbers of χ= 12, 11 and 10 occur in Viscum at the north-south distributional extremes in southern Africa and Europe and, with the addition χ= 13, in all the species with eastward distributions in Madagascar, Asia and Australia. Polyploidy is rare in African and Madagascan members of both families, as is generally also true for other parts of the world where they have been studied. Translocation heterozygosity is reported for a number of species in Viscum.
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Claims 6
Claim · model-written summary
The studied Loranthaceae genera had base chromosome number χ= 9.
Not reportedTaxon
Verbatim
e0“The base chromosome number of all genera studied is χ= 9”
Claim · model-written summary
The authors propose χ= 14 as the base chromosome number of Viscum and Viscaceae.
ViscumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“χ= 14 is suggested as the base chromosome number for both Viscum and the family as a whole”
Claim · model-written summary
Madagascan Visca had modal chromosome number χ= 13.
Verbatim
e0“The Madagascan Visca, however, have a modal chromosome number of χ= 13”
Claim · model-written summary
Aneuploid chromosome numbers occurred in Viscum across described distributional extremes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aneuploid chromosome numbers of χ= 12, 11 and 10 occur in Viscum at the north-south distributional extremes in southern Africa and Europe”
Claim · model-written summary
Polyploidy was rare in African and Madagascan members of both families.
Not reportedTaxon
Verbatim
e0“Polyploidy is rare in African and Madagascan members of both families”
Claim · model-written summary
Translocation heterozygosity was reported for several Viscum species.
- Outcome
- Translocation heterozygositye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Translocation heterozygosity is reported for a number of species in Viscum”