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(American Journal of Botany. 2004;91:736-747.)
© 2004 Botanical Society of America, Inc.

Systematics

Reticulate evolution in kiwifruit (Actinidia, Actinidiaceae) identified by comparing their maternal and paternal phylogenies1

Joëlle Chat2,5, Blanca Jáuregui2, Rémy J. Petit3 and Sophie Nadot4

2Unité de Recherches sur les Espèces Fruitières et la Vigne, Institut National de la Recherche Agronomique, B. P. 81, F-33883 Villenave d'Ornon cedex, France; 3UMR Biodiversité, Gènes et Ecosystèmes, 69 route d'Arcachon, F-33610 Cestas cedex, France; 4Laboratoire Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, F-91405 Orsay cedex, France

Evolutionary relationships within Actinidia, a genus known for the contrasting mode of inheritance of its plastids and mitochondria, were studied. The phylogenetic analysis is based on chloroplast (cp) and mitochondrial (mt) restriction site and sequence data (matK, psbC-trnS, rbcL, and trnL-trnF for cpDNA; nad1-2/3 and nad4-1/2 for mtDNA). The analysis of cp sequence data confirms the hypothesis that the four currently recognized sections are not monophyletic. The detection of incongruences among phylogenies (mtDNA vs. cpDNA tree) coupled with the detection of intraspecific polymorphisms confirms some of the reticulations previously emphasized, diagnoses new hybridization/introgression events, and provides evidence for multiple origin of at least two polyploid taxa. A number of hybridization/introgression events at the diploid, tetraploid, and possibly hexaploid levels are documented. The extensive reticulate evolution undergone by Actinidia could account for the lack of clear morphological discontinuities at the species level.

Key Words: chloroplast microsatellites • hybridization • mitochondrial indels • molecular phylogeny • multiple origin of polyploids




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J. Shaw and R. L. Small
Chloroplast DNA phylogeny and phylogeography of the North American plums (Prunus subgenus Prunus section Prunocerasus, Rosaceae)
Am. J. Botany, December 1, 2005; 92(12): 2011 - 2030.
[Abstract] [Full Text] [PDF]


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