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Evolution of Rosaceae fruit types based on nuclear phylogeny in the context of geological times and genome duplication

文章来源:  |  发布时间:2017-08-09  |  作者:陈斯云  |  浏览次数:  |  【打印】 【关闭

 

Evolution of Rosaceae fruit types based on nuclear phylogeny in the context of geological times and genome duplication.

Xiang Yezi, Huang Chien-Hsun, Hu Yi, Wen Jun, Li Shisheng, Yi Ting-Shuang, Chen Hongyi, Xiang Jun, Ma Hong

Mol Biol Evol. 2017 Feb 1;34(2):262-281. doi: 10.1093/molbev/msw242.

https://www.ncbi.nlm.nih.gov/pubmed/27856652

Abstract:

Fruits are the defining feature of angiosperms, likely have contributed to angiosperm successes by protecting and dispersing seeds, and provide foods to humans and other animals, with many morphological types and important ecological and agricultural implications.Rosaceae is a family with 3000 species and an extraordinary spectrum of distinct fruits, including fleshy peach, apple, and strawberry prized by their consumers, as well as dry achenetum and follicetum with features facilitating seed dispersal, excellent for studying fruit evolution. To address Rosaceae fruit evolution and other questions, we generated 125 new transcriptomic and genomic datasets and identified hundreds of nuclear genes to reconstruct a well-resolved Rosaceae phylogeny with highly supported monophyly of all subfamilies and tribes. Molecular clock analysis revealed an estimated age of 101.6 Ma for crown Rosaceae and divergence times of tribes and genera, providing a geological and climate context for fruit evolution. Phylogenomic analysis yielded strong evidence for numerous whole genome duplications (WGDs), supporting the hypothesis that the apple tribe had a WGD and revealing another one shared by fleshy fruit-bearing members of this tribe, with moderate support for WGDs in the peach tribe and other groups. Ancestral character reconstruction for fruit types supports independent origins of fleshy fruits from dry-fruit ancestors, including the evolution of drupes (e.g., peach) and pomes (e.g., apple) from follicetum, and drupetum (raspberry and blackberry) from achenetum. We propose that WGDs and environmental factors, including animals, contributed to the evolution of the many fruits inRosaceae, which provide a foundation for understanding fruit evolution.

KEYWORDS:

Rosaceae; coalescence; fruit evolution; genome duplication; molecular clock; nuclear phylogeny


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