Uniform Selection as a Primary Force Reducing Population Genetic Differentiation of Cavitation Resistance across a Species Range

Lamy, Jean‐Baptiste; Bouffier, Laurent; Burlett, Régis; Plomion, Christophe; Cochard, Hervé; Delzon, Sylvain

doi:10.1371/journal.pone.0023476

Cited by 141 publications

(164 citation statements)

References 95 publications

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“…We found no evidence of increased population differentiation under more stressful environments (Table 3.1). Global F ST (0.132) was moderate and similar to previous values reported in the species for allozymes (González-Martínez et al 2002), microsatellites Lamy et al 2011) and smaller SNP sets (see Chapter 4). Variation of allele frequencies among populations within regions accounted for less than 2% of the variance observed, indicating homogeneous neutral gene pools.…”

Section: Discussionsupporting

confidence: 87%

“…F ST distributions were later computed following the parametric bootstrap procedure proposed by Lamy et al (2011), to be compared to Q ST ones (see below).…”

Section: Molecular Markersmentioning

confidence: 99%

“…To disentangle the effects of genetic drift from those of selection, Q ST * probability distributions were compared to those of neutral F ST , using a nonparametric and free distribution two-sample test for equality of the 2.5 and the 97.5 quantiles with Bonferroni correction for multiple comparisons (Lamy et al 2011). Both Q ST * and F ST were computed at the species level and within neutral gene pools.…”

Section: Quantitative Traitsmentioning

confidence: 99%

“…It is found in various ecological situations, from sea level to an altitude of 2100 m in the High Atlas (Morocco), from regions characterized by heavy annual rainfall in an Atlantic climate to dry regions in the semi-arid Mediterranean climate, and from calcareous to acidic soils (Al ıa & Martin 2003). Its scattered distribution has resulted in local adaptations and high levels of genetic differentiation for adaptive traits across its natural range (Gonz alez-Mart ınez et al Lamy et al 2011Lamy et al , 2014. Considerable genetic differentiation between ecotypes has been reported for various neutral molecular markers, providing clear evidence for a geographic structure of genetic diversity in this species Jaramillo-Correa et al 2010, 2015.…”

Section: Introductionmentioning

confidence: 99%

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Ecological and association genetics in two Mediterranean pine species

Quilón¹

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Section: Discussionsupporting

confidence: 87%

“…F ST distributions were later computed following the parametric bootstrap procedure proposed by Lamy et al (2011), to be compared to Q ST ones (see below).…”

Section: Molecular Markersmentioning

confidence: 99%

Section: Quantitative Traitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecological and association genetics in two Mediterranean pine species

Quilón¹

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“…A fundamental question concerns the plasticity and genetic diversity of embolism resistance within species 22,29,30 . If the tight link between embolism resistance and water availability is the product of natural selection over many generations and adaptation is limited by a long generation cycle of perennial plants, then the rapid pace of climate change may outstrip the capacity of populations to adapt.…”

Section: Letter Researchmentioning

confidence: 99%

Global convergence in the vulnerability of forests to drought

Choat

Jansen

Brodribb

et al. 2012

Nature

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2,098

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2,036

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Shifts in rainfall patterns and increasing temperatures associated with climate change are likely to cause widespread forest decline in regions where droughts are predicted to increase in duration and severity. One primary cause of productivity loss and plant mortality during drought is hydraulic failure. Drought stress creates trapped gas emboli in the water transport system, which reduces the ability of plants to supply water to leaves for photosynthetic gas exchange and can ultimately result in desiccation and mortality. At present we lack a clear picture of how thresholds to hydraulic failure vary across a broad range of species and environments, despite many individual experiments. Here we draw together published and unpublished data on the vulnerability of the transport system to drought-induced embolism for a large number of woody species, with a view to examining the likely consequences of climate change for forest biomes. We show that 70% of 226 forest species from 81 sites worldwide operate with narrow hydraulic safety margins against injurious levels of drought stress and therefore potentially face long-term reductions in productivity and survival if temperature and aridity increase as predicted for many regions across the globe. Safety margins are largely independent of mean annual precipitation, showing that there is global convergence in the vulnerability of forests to drought, with all forest biomes equally vulnerable to hydraulic failure regardless of their current rainfall environment. These findings provide insight into why drought-induced forest decline is occurring not only in arid regions but also in wet forests not normally considered at drought risk

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Direct and correlated responses to artificial selection for growth and water‐use efficiency in a Mediterranean pine

Suárez-Vidal

Sampedro

Climent³

et al. 2021

American J of Botany

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Persistence of tree populations in the face of global change relies on their capacity to respond to biotic and abiotic stressors through plastic or adaptive changes. Genetic adaptation will depend on the additive genetic variation within populations and the heritability of traits related to stress tolerance. Because traits can be genetically linked, selective pressure acting on one trait may lead to correlated responses in other traits. METHODS: To test direct and correlated responses to selection for growth and drought tolerance in Pinus halepensis, we selected trees in a parental population for higher growth and greater water-use efficiency (WUE) and compared their offspring with the offspring of random trees from the parental population in two contrasting common gardens. We estimated direct responses to selection for growth and WUE and correlated responses for growth and tolerance to abiotic and biotic stressors. RESULTS: We found a strong response to selection and high realized heritability for WUE, but no response to selection for growth. Correlated responses to selection in other lifehistory traits were not significant, except for concentration of some chemical defenses, which was greater in the offspring of mother trees selected for growth than in the offspring of unselected control trees. CONCLUSIONS: The empirical evidence of direct responses to selection for high WUE suggests that P. halepensis has the potential to evolve in response to increasing drought stress. Contrary to expectations, the results are not conclusive of a potential negative impact of WUE and growth selection on other key life-history traits. KEY WORDS chemical defenses; correlated responses to selection; direct responses to selection; drought stress; global change; intrinsic water-use efficiency; Mediterranean pine; productivity; realized heritability; terpenes.

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Uniform Selection as a Primary Force Reducing Population Genetic Differentiation of Cavitation Resistance across a Species Range

Cited by 141 publications

References 95 publications

Ecological and association genetics in two Mediterranean pine species

Ecological and association genetics in two Mediterranean pine species

Global convergence in the vulnerability of forests to drought

Direct and correlated responses to artificial selection for growth and water‐use efficiency in a Mediterranean pine

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