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(American Journal of Botany. 2004;91:1387-1397.)
© 2004 Botanical Society of America, Inc.

Systematics

Radiation of the Australian Salicornioideae (Chenopodiaceae)—based on evidence from nuclear and chloroplast DNA sequences1

K. A. Shepherd2,4, M. Waycott3 and A. Calladine3

2School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia, 6009, Australia; 3School of Tropical Biology, James Cook University, Townsville, Queensland, 4811, Australia

In phylogenetic analyses of nuclear ITS and chloroplast trnL DNA sequences, the mostly endemic Australian genera; Halosarcia, Pachycornia, Sclerostegia, Tecticornia, and Tegicornia of the subfamily Salicornioideae (Chenopodiaceae) together form a monophyletic group, congruent with the hypothesis that they evolved from a common ancestor. However, limited genetic differentiation evident in both nrDNA and cpDNA sequences among these taxa suggests a possible rapid radiation. Based on fossil pollen records and climatic models of other authors, it is hypothesized that the expansion of the Australian endemic Salicornioideae most likely occurred during the Late Miocene to Pliocene, when increasing aridity caused the formation of extensive salt lakes along endorheic paleodrainage channels. Moreover, Australian Sarcocornia representatives were supported as monophyletic, nested within a paraphyletic Sarcocornia clade that also comprised European Salicornia in the ITS analysis. This suggests that Sarcocornia arrived in Australia subsequent to the ancestor of the Australian endemic genera most likely via long-distance dispersal.

Key Words: Chenopodiaceae • Halosarcia • ITS • phylogeny • rapid radiation • Salicornioideae • trnL




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