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

TY - JOUR

T1 - A phylogenetic analysis of the genus Psathyrostachys (Poaceae) based on one nuclear gene, three plastid genes, and morphology

AU - Petersen, Gitte

AU - Seberg, Ole

AU - Baden, Claus

N1 - Keywords Psathyrostachys - DMC1 - rpoA - rbcL - rpoC2 - morphology - phylogeny - total evidence

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

U2 - 10.1007/s00606-004-0196-1

DO - 10.1007/s00606-004-0196-1

M3 - Journal article

SN - 0378-2697

VL - 249

SP - 99

EP - 110

JO - Plant Systematics and Evolution

JF - Plant Systematics and Evolution

IS - 1-2

ER -