Are there morphological and life-history traits under climate-dependent differential selection in S Tunesian Diplotaxis harra (Forssk.) Boiss. (Brassicaceae) populations?

URN to cite this document:

urn:nbn:de:bvb:355-epub-365683 Copy

DOI to cite this document:

10.5283/epub.36568 Copy

Oberprieler, Christoph ; Zimmer, Claudia ; Bog, Manuela

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License: Creative Commons Attribution 4.0 PDF - Published Version (893kB)

Date of publication of this fulltext: 23 Jan 2018 15:28

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Details

Item type:	Article
Journal or Publication Title:	Ecology and Evolution
Publisher:	Wiley Subscription Services Inc.
Volume:	8
Number of Issue or Book Chapter:	2
Page Range:	pp. 1047-1062
Date:	15 December 2017
Institutions:	Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Group Plant Systematics and Evolution (Prof. Dr. Christoph Oberprieler)
Projects:	Open Access Publizieren (DFG)
Identification Number:	Value Type 10.1002/ece3.3705 DOI
Keywords:	adaptation, aridity, Cruciferae, phenotypic plasticity, population genomics
Dewey Decimal Classification:	500 Science > 580 Botanical sciences
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Yes
Item ID:	36568

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Abstract

Adaptation of morphological, physiological, or life-history traits of a plant species to heterogeneous habitats through the process of natural selection is a paramount process in evolutionary biology. We have used a population genomic approach to disentangle selection-based and demography-based variation in morphological and life-history traits in the crucifer Diplotaxis harra (Forssk.) Boiss. ...

Abstract

Adaptation of morphological, physiological, or life-history traits of a plant species to heterogeneous habitats through the process of natural selection is a paramount process in evolutionary biology. We have used a population genomic approach to disentangle selection-based and demography-based variation in morphological and life-history traits in the crucifer Diplotaxis harra (Forssk.) Boiss. (Brassicaceae) encountered in populations along aridity gradients in S Tunisia. We have genotyped 182 individuals from 12 populations of the species ranging from coastal to semidesert habitats using amplified fragment length polymorphism (AFLP) fingerprinting and assessed a range of morphological and life-history traits from their progeny cultivated under common-garden conditions. Application of three different statistical approaches for searching AFLP loci under selection allowed us to characterize candidate loci, for which their association with the traits assessed was tested for statistical significance and correlation with climate data. As a key result of this study, we find that only the shape of cauline leaves seems to be under differential selection along the aridity gradient in S Tunisian populations of Diplotaxis harra, while for all other traits studied neutral biogeographical and/or random factors could not be excluded as explanation for the variation observed. The counter-intuitive finding that plants from populations with more arid habitats produce broader leaves under optimal conditions of cultivation than those from more mesic habitats is interpreted as being ascribable to selection for a higher plasticity in this trait under more unpredictable semidesert conditions compared to the more predictable ones in coastal habitats.

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