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(American Journal of Botany. 2005;92:1548-1558.)
© 2005 Botanical Society of America, Inc.

Systematics and Phytogeography

Molecular phylogeny of Oryzeae (Poaceae) based on DNA sequences from chloroplast, mitochondrial, and nuclear genomes1

Ya-Long Guo2 and Song Ge2,3,4

2Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; 3Graduate School, Chinese Academy of Sciences, Beijing 100039, China

ABSTRACT

The phylogeny and evolutionary history of the rice tribe (Oryzeae) were explored using sequences of five DNA fragments (matK, trnL, nad1, Adh2, and GPA1) from chloroplast, mitochondrial, and nuclear genomes. Results indicate that (1) Oryzeae is monophyletic and falls into two main clades corresponding to the traditionally recognized subtribes; (2) previous recognition of three monotypic genera (Hydrochloa, Porteresia, and Prosphytochloa) is not justified; and (3) close affinities of the monoecious genera are not supported, suggesting the possibility of multiple origins of unisexual florets. Based on the magnitude of matK and GPA1 sequence divergence, we suggest that Oryza and Leersia branched off from the remaining genera of Oryzeae ~20 million years ago (mya), and separated from each other ~14 mya. A divergence time of ~9 mya is obtained for the most basal split within Oryza. These estimates suggest that Oryzeae diverged during the Miocene, and thus imply that long-distance dispersal appears to be one of the important factors in the diversification of the tribe.

Key Words: biogeography • divergence time • multiple sequences • Oryzeae • phylogeny






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