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The effect of drought stress on heterozygosity–fitness correlations in pedunculate oak (Quercus robur)

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The effect of drought stress on heterozygosity–fitness correlations in pedunculate oak (Quercus robur). / Vranckx, Guy; Jacquemyn, Hans; Mergeay, Joachim; Cox, Karen; Janssens, Pieter; Gielen, Bie An Sofie; Muys, Bart; Honnay, Olivier.

In: Annals of Botany, Vol. 113, 2014, p. 1057-1069.

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Vranckx, Guy ; Jacquemyn, Hans ; Mergeay, Joachim ; Cox, Karen ; Janssens, Pieter ; Gielen, Bie An Sofie ; Muys, Bart ; Honnay, Olivier. / The effect of drought stress on heterozygosity–fitness correlations in pedunculate oak (Quercus robur). In: Annals of Botany. 2014 ; Vol. 113. pp. 1057-1069.

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@article{b07fddf9fbf6422c9dafe7ab6e59bff4,
title = "The effect of drought stress on heterozygosity–fitness correlations in pedunculate oak (Quercus robur)",
abstract = "Background and Aims The interaction between forest fragmentation and predicted climate change may pose a serious threat to tree populations. In small and spatially isolated forest fragments, increased homozygosity may directly affect individual tree fitness through the expression of deleterious alleles. Climate change-induced drought stress may exacerbate these detrimental genetic consequences of forest fragmentation, as the fitness response to low levels of individual heterozygosity is generally thought to be stronger under environmental stress than under optimal conditions. Methods To test this hypothesis, a greenhouse experiment was performed in which various transpiration and growth traits of 6-month-old seedlings of Quercus robur differing in multilocus heterozygosity (MLH) were recorded for 3 months under a well-watered and a drought stress treatment. Heterozygosity–fitness correlations (HFC) were examined by correlating the recorded traits of individual seedlings to their MLH and by studying their response to drought stress. Key Results Weak, but significant, effects of MLH on several fitness traits were obtained, which were stronger for transpiration variables than for the recorded growth traits. High atmospheric stress (measured as vapour pressure deficit) influenced the strength of the HFCs of the transpiration variables, whereas only a limited effect of the irrigation treatment on the HFCs was observed. Conclusions Under ongoing climate change, increased atmospheric stress in the future may strengthen the negative fitness responses of trees to low MLH. This indicates the necessity to maximize individual multilocus heterozygosity in forest tree breeding programmes.",
author = "Guy Vranckx and Hans Jacquemyn and Joachim Mergeay and Karen Cox and Pieter Janssens and Gielen, {Bie An Sofie} and Bart Muys and Olivier Honnay",
year = "2014",
doi = "10.1093/aob/mcu025",
language = "English",
volume = "113",
pages = "1057--1069",
journal = "Annals of Botany",
issn = "0305-7364",
publisher = "Oxford University Press",

}

RIS

TY - JOUR

T1 - The effect of drought stress on heterozygosity–fitness correlations in pedunculate oak (Quercus robur)

AU - Vranckx, Guy

AU - Jacquemyn, Hans

AU - Mergeay, Joachim

AU - Cox, Karen

AU - Janssens, Pieter

AU - Gielen, Bie An Sofie

AU - Muys, Bart

AU - Honnay, Olivier

PY - 2014

Y1 - 2014

N2 - Background and Aims The interaction between forest fragmentation and predicted climate change may pose a serious threat to tree populations. In small and spatially isolated forest fragments, increased homozygosity may directly affect individual tree fitness through the expression of deleterious alleles. Climate change-induced drought stress may exacerbate these detrimental genetic consequences of forest fragmentation, as the fitness response to low levels of individual heterozygosity is generally thought to be stronger under environmental stress than under optimal conditions. Methods To test this hypothesis, a greenhouse experiment was performed in which various transpiration and growth traits of 6-month-old seedlings of Quercus robur differing in multilocus heterozygosity (MLH) were recorded for 3 months under a well-watered and a drought stress treatment. Heterozygosity–fitness correlations (HFC) were examined by correlating the recorded traits of individual seedlings to their MLH and by studying their response to drought stress. Key Results Weak, but significant, effects of MLH on several fitness traits were obtained, which were stronger for transpiration variables than for the recorded growth traits. High atmospheric stress (measured as vapour pressure deficit) influenced the strength of the HFCs of the transpiration variables, whereas only a limited effect of the irrigation treatment on the HFCs was observed. Conclusions Under ongoing climate change, increased atmospheric stress in the future may strengthen the negative fitness responses of trees to low MLH. This indicates the necessity to maximize individual multilocus heterozygosity in forest tree breeding programmes.

AB - Background and Aims The interaction between forest fragmentation and predicted climate change may pose a serious threat to tree populations. In small and spatially isolated forest fragments, increased homozygosity may directly affect individual tree fitness through the expression of deleterious alleles. Climate change-induced drought stress may exacerbate these detrimental genetic consequences of forest fragmentation, as the fitness response to low levels of individual heterozygosity is generally thought to be stronger under environmental stress than under optimal conditions. Methods To test this hypothesis, a greenhouse experiment was performed in which various transpiration and growth traits of 6-month-old seedlings of Quercus robur differing in multilocus heterozygosity (MLH) were recorded for 3 months under a well-watered and a drought stress treatment. Heterozygosity–fitness correlations (HFC) were examined by correlating the recorded traits of individual seedlings to their MLH and by studying their response to drought stress. Key Results Weak, but significant, effects of MLH on several fitness traits were obtained, which were stronger for transpiration variables than for the recorded growth traits. High atmospheric stress (measured as vapour pressure deficit) influenced the strength of the HFCs of the transpiration variables, whereas only a limited effect of the irrigation treatment on the HFCs was observed. Conclusions Under ongoing climate change, increased atmospheric stress in the future may strengthen the negative fitness responses of trees to low MLH. This indicates the necessity to maximize individual multilocus heterozygosity in forest tree breeding programmes.

U2 - 10.1093/aob/mcu025

DO - 10.1093/aob/mcu025

M3 - A1: Web of Science-article

VL - 113

SP - 1057

EP - 1069

JO - Annals of Botany

JF - Annals of Botany

SN - 0305-7364

ER -

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