Data/hora: 03/06/2024 02:22:03

Provedor de dados: | 17
País: | United Kingdom
Título: | Third-codon transversion rate-based _Nymphaea_ basal angiosperm phylogeny -- concordance with developmental evidence
Autores: | Xiaohan Yang; Gerald A. Tuskan; Timothy J. Tschaplinski; (Max) Zong-Ming Cheng.
Data: | 2007-07-02
Ano: | 2007
Palavras-chave: | Ecology; Plant Biology; Evolutionary Biology.
Resumo: | Flowering plants (angiosperms) appeared on Earth rather suddenly approximately 130 million years ago and underwent a massive expansion in the subsequent 10-12 million years. Current molecular phylogenies have predominantly identified _Amborella_, followed by _Nymphaea_ (water lilies) or _Amborella_ plus _Nymphaea_, in the ANITA clade (_Amborella_, Nymphaeales, Illiciaceae, Trimeniaceae and Austrobaileyaceae) as the earliest angiosperm. However, developmental studies suggest that the earliest angiosperm had a 4-cell/4-nucleus female gametophyte and a diploid endosperm represented by _Nymphaea_, suggesting that _Amborella_, having an 8-cell/9-nucleus female gametophyte and a triploid endosperm, cannot be representative of the basal angiosperm. This evolution-development discordance is possibly caused by erroneous inference based on phylogenetic signals with low neutrality and/or high saturation. Here we show that the 3rd codon transversion (P3Tv), with high neutrality and low saturation, is a robust high-resolution phylogenetic signal for such divergences and that the P3Tv-based land plant phylogeny cautiously identifies _Nymphaea_, followed by _Amborella_, as the most basal among the angiosperm species examined in this study. This P3Tv-based phylogeny contributes insights to the origin of angiosperms with concordance to fossil and stomata development evidence.
Tipo: | Manuscript

Identificador:

http://precedings.nature.com/documents/320/version/1

oai:nature.com:10.1038/npre.2007.320.1

http://dx.doi.org/10.1038/npre.2007.320.1

Fonte: | Nature Precedings
Fonte: | Creative Commons Attribution 3.0 License