Morphology, ploidy and molecular phylogenetics reveal a new diploid species from Africa in the baobab genus Adansonia (Malvaceae: Bombacoideae)

Pettigrew, Jack D., Bell, Karen L., Bhagwandin, Adhil, Grinan, Eunice, Jillani, Ngalla, Meyer, Jean, Wabuyele, Emily and Vickers, Claudia E. (2012) Morphology, ploidy and molecular phylogenetics reveal a new diploid species from Africa in the baobab genus Adansonia (Malvaceae: Bombacoideae). Taxon, 61 6: 1240-1250.

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Author Pettigrew, Jack D.
Bell, Karen L.
Bhagwandin, Adhil
Grinan, Eunice
Jillani, Ngalla
Meyer, Jean
Wabuyele, Emily
Vickers, Claudia E.
Title Morphology, ploidy and molecular phylogenetics reveal a new diploid species from Africa in the baobab genus Adansonia (Malvaceae: Bombacoideae)
Formatted title
Morphology, ploidy and molecular phylogenetics reveal a new diploid species from Africa in the baobab genus Adansonia (Malvaceae: Bombacoideae)
Journal name Taxon   Check publisher's open access policy
ISSN 0040-0262
Publication date 2012-12
Year available 2012
Sub-type Article (original research)
Volume 61
Issue 6
Start page 1240
End page 1250
Total pages 11
Place of publication Vienna, Austria
Publisher International Association for Plant Taxonomy
Collection year 2013
Language eng
Formatted abstract
The genus Adansonia has a disjunct geographical distribution: six species are endemic in Madagascar, one in Africa, and one in Australia. The well-known African baobab (Adansonia digitata) is an iconic tree with considerable ethnobotanical significance. In contrast to the other seven species, which are diploid, A.digitata is tetraploid. A common ancestor of A.digitata and the other diploid baobab species would be diploid; however, there are no diploid species recorded on the African mainland. Examining variation in floral and pollen characters and chromosome number in specimens from Africa identified a new diploid baobab species, Adansonia kilima sp. nov., which co-exists with A.digitata in Africa. Adansonia kilima is restricted to moderate elevations (650-1500m), in contrast to A.digitata, which is widespread throughout Africa but prefers elevations below 800 m. Adansonia kilima is superficially similar to A.digitata, but can be differentiated on the basis of floral morphology, pollen, and chromosome number. We used two chloroplast DNA markers and the nuclear ITS to examine phylogenetic relationships within Adansonia. Three lineages were observed: one containing the Malagasy species, one containing the Australian species, and one containing the African species. The relationships between these clades were difficult to resolve, but a link between the African and Australian clades emerged when the analysis used fewer replicate samples of individual Malagasy taxa, included indel characters and included fewer outgroup taxa. The ITS phylogeny demonstrated that A.digitata and A.kilima are genetically similar, suggesting that tetraploidy evolved relatively recently.
Keyword Adansonia kilima
Africa
Baobab
Diploid
Molecular phylogeny
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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