期刊
AMERICAN JOURNAL OF BOTANY
卷 87, 期 1, 页码 96-107出版社
BOTANICAL SOC AMER INC
DOI: 10.2307/2656688
关键词
gene family; grasses; nuclear gene; phylogeny; phytochrome B; Poaceae
Phylogenetic analyses of partial phytochrome B (PHYB) nuclear DNA sequences provide unambiguous resolution of evolutionary relationships within Poaceae. Analysis of PHYB nucleotides from 51 taxa representing seven traditionally recognized subfamilies clearly distinguishes three early-diverging herbaceous bambusoid lineages. First and most basal are Anomochloa and Streptochaeta. second is Pharus, and third is Puelia. The remaining grasses occur in two principal. highly supported clades. The first comprises bambusoid, oryzoid, and pooid genera (the BOP clads); the second comprises panicoid, arundinoid, chloridoid, and centothecoid genera (the PACC clade). The PHYB phylogeny is the first nuclear gene tree to address comprehensively phylogenetic relationships among grasses. It corroborates several inferences made from chloroplast gene trees, including the PACC clade, and the basal position of the herbaceous bamboos Anomochloa, Streptochaeta. and Pharus However the clear resolution of the sister group relationship among bambusoids, oryzoids, and pooids in the PHYB tree is novel; the relationship is only weakly supported in ndhF trees and is nonexistent in rbcL and plastid restriction site trees. Nuclear PHYB data support Anomochlooideae, Pharoideae, Pooideae sensu lato, Oryzoideae, Panicoideae, and Chloridoideae, and concur in the polyphyly of both Arundinoideae and Bambusoideae.
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