State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, China.
PLoS One. 2014 Jan 31;9(1):e87625. doi: 10.1371/journal.pone.0087625. eCollection 2014.
Collabieae (Orchidaceae) is a long neglected tribe with confusing tribal and generic delimitation and little-understood phylogenetic relationships. Using plastid matK, psaB, rbcL, and trnH-psbA DNA sequences and morphological evidence, the phylogenetic relationships within the tribe Collabieae were assessed as a basis for revising their tribal and generic delimitation. Collabieae (including the previously misplaced mycoheterotrophic Risleya) is supported as monophyletic and nested within a superclade that also includes Epidendreae, Podochileae, Cymbidieae and Vandeae. Risleya is nested in Collabiinae and sister to Chrysoglossum, a relationship which, despite their great vegetative differences, is supported by floral characters. Ania is a distinct genus supported by both morphological and molecular evidence, while redefined Tainia includes Nephelaphyllum and Mischobulbum. Calanthe is paraphyletic and consists four clades; the genera Gastrorchis, Phaius and Cephalantheropsis should be subsumed within Calanthe. Calanthe sect. Ghiesbreghtia is nested within sect. Calanthe, to which the disputed Calanthe delavayi belongs as well. Our results indicate that, in Collabieae, habit evolved from being epiphytic to terrestrial.
兰科Collabieae 族是一个长期被忽视的族，其族和属的划分混乱，系统发育关系也知之甚少。本研究利用质体 matK、psaB、rbcL 和 trnH-psbA 序列和形态证据，评估了该族内的系统发育关系，以此为修订其族和属的划分提供依据。Collabieae（包括以前被错误归类的菌根异养的 Risleya）被支持为单系群，并嵌套在一个超级进化枝中，该超级进化枝还包括 Epidendreae、Podochileae、Cymbidieae 和 Vandeae。Risleya 嵌套在 Collabiinae 中，与 Chrysoglossum 为姐妹关系，尽管它们在营养体上有很大的差异，但这种关系得到了花部特征的支持。Ania 是一个由形态和分子证据共同支持的独特属，而重新定义的 Tainia 包括 Nephelaphyllum 和 Mischobulbum。Calanthe 是并系群，由四个分支组成；Gastrorchis、Phaius 和 Cephalantheropsis 这三个属应归入 Calanthe 属中。Calanthe sect. Ghiesbreghtia 嵌套在 Calanthe sect. 中，有争议的 Calanthe delavayi 也属于该sect.。我们的研究结果表明，在 Collabieae 族中，习性从附生到陆生发生了进化。
