Evolution through genetically controlled allometry space

被引:111
作者
Langlade, NB
Feng, XZ
Dransfield, T
Copsey, L
Hanna, AI
Thébaud, C
Bangham, A
Hudson, A
Coen, E [1 ]
机构
[1] John Innes Ctr, Dept Cell & Dev Biol, Norwich NR4 7UH, Norfolk, England
[2] Univ Edinburgh, Sch Biol Sci, Inst Mol Plant Sci, Edinburgh EH9 3JH, Midlothian, Scotland
[3] Univ E Anglia, Sch Comp Sci, Norwich NR4 7TJ, Norfolk, England
[4] Univ Toulouse 3, CNRS, UMR 5174, F-31062 Toulouse, France
关键词
leaf; morphometry; QTL analysis; shape variation; species;
D O I
10.1073/pnas.0504210102
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Understanding evolutionary change requires phenotypic differences between organisms to be placed in a genetic context. However, there are few cases where it has been possible to define an appropriate genotypic space for a range of species. Here we address this problem by defining a genetically controlled space that captures variation in shape and size between closely related species of Antirrhinum. The axes of the space are based on an allometric model of leaves from an F-2 of an interspecific cross between Antirrhinum majus and Antirrhinum charidemi. Three principal components were found to capture most of the genetic variation in shape and size, allowing a three-dimensional allometric space to be defined. The contribution of individual genetic loci was determined from QTL analysis, allowing each locus to be represented as a vector in the allometric space. Leaf shapes and sizes of 18 different Antirrhinum taxa, encompassing a broad range of leaf morphologies, could be accurately represented as clouds within the space. Most taxa overlapped with, or were near to, at least one other species in the space, so that together they defined a largely interconnected domain of viable forms. It is likely that the pattern of evolution within this domain reflects a combination of directional selection and evolutionary tradeoffs within a high dimensional space.
引用
收藏
页码:10221 / 10226
页数:6
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