, Volume 249, Issue 1-2, pp 99-110
Date: 11 Oct 2004

A phylogenetic analysis of the genus Psathyrostachys (Poaceae) based on one nuclear gene, three plastid genes, and morphology

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Abstract.

A phylogenetic analysis of the small, Central Asian genus Psathyrostachys Nevski is presented. The analysis is based on morphological characters and nucleotide sequence data from one nuclear gene, DMC1, and three plastid genes, rbcL, rpoA, and rpoC2. Separate analyses of the three data partitions (morphology, nuclear sequences, and plastid sequences) result in mostly congruent trees. The plastid and nuclear sequences produce completely congruent trees, and only the trees based on plastid sequences and morphological characters are incongruent. Combined analysis of all data results in a fairly well-resolved strict consensus tree: Ps. rupestris is the sister to the remaining species, which are divided into two clades: one including Ps. fragilis and Ps. caduca, the other including Ps. juncea, Ps. huashanica, Ps. lanuginosa, Ps. stoloniformis, and Ps. kronenburgii. Pubescent culms and more than 20 mm long spikelets are synapomorphies for the former clade, whereas short lemma awns and leaf epidermis cells with thin, straight walls are synapomorphies for the latter.

We dedicate this paper to the memory of our close friend and colleague Claus Baden (1952–1999).
We wish to thank Charlotte Hansen and Lisbeth Knudsen for skilful technical assistance, Signe Frederiksen for translation of Russian literature, Niels Jacobsen for recovering Baden’s original specimen list, and Frank Blattner for constructive comments on the manuscript. Financial support from the Danish National Sciences Research Council (grant 96-01340) is gratefully acknowledged.