Tests for the joint evolution of mating system and drought escape in Mimulus

Ivey, Christopher T.; Carr, David E.

doi:10.1093/aob/mcr160

Cited by 71 publications

(66 citation statements)

References 78 publications

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“…Thus, for H. anomalus , the hotter, drier environment of the more southerly sites selectively favored correlated evolution of traits contributing to a resource‐acquisitive and earlier reproductive strategy to escape soil moisture depletion predictably occurring late in the growing season, despite lower fertility. This is consistent with the growing literature documenting earlier onset of reproduction as an evolutionary response of annual species to many stresses, including drought, although earlier onset of reproduction is not always accompanied by the greater pre‐reproductive growth rates expected for a ‘live fast, die young’ strategy (Arendt, ; Geber & Dawson, ; Stanton et al ., ; McKay et al ., ; Griffith & Watson, ; Heschel & Reginos, ; Franks et al ., ; Franks & Weis, ; Kigel et al ., ; Ivey & Carr, ).…”

Section: Discussionmentioning

confidence: 99%

Adaptive differentiation of traits related to resource use in a desert annual along a resource gradient

et al. 2013

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SummaryPlant resource-use traits are generally hypothesized to be adaptively differentiated for populations distributed along resource gradients. Although nutrient limitations are expected to select for resource-conservative strategies, water limitations may select for either resource-conservative or -acquisitive strategies. We test whether population differentiation reflects local adaptation for traits associated with resource-use strategies in a desert annual (Helianthus anomalus) distributed along a gradient of positively covarying water and nutrient availability.We compared quantitative trait variation (Q ST ) with neutral genetic differentiation (F ST ), in a common garden glasshouse study, for leaf economics spectrum (LES) and related traits: photosynthesis (A mass , A area ), leaf nitrogen (N mass , N area ), leaf lifetime (LL), leaf mass per area (LMA), leaf water content (LWC), water-use efficiency (WUE, estimated as d 13 C) and days to first flower (DFF). Q ST -F ST differences support adaptive differentiation for A mass , N mass , N area , LWC and DFF. The trait combinations associated with drier and lower fertility sites represent correlated trait evolution consistent with the more resource-acquisitive end of the LES. There was no evidence for adaptive differentiation for A area , LMA and WUE.These results demonstrate that hot dry environments can selectively favor correlated evolution of traits contributing to a resource-acquisitive and earlier reproduction 'escape' strategy, despite lower fertility.

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Section: Discussionmentioning

confidence: 99%

Adaptive differentiation of traits related to resource use in a desert annual along a resource gradient

et al. 2013

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“…By contrast, our M. guttatus accessions delay flowering and are thus restricted to less ephemeral sites that remain moist through midsummer. Thus, a short critical photoperiod is a key component of M. nasutus 's drought avoidance strategy (Wu et al ., ; Ivey & Carr, ). By facilitating habitat specialization, as well as by promoting asynchronous flowering where the two species do co‐occur, M. nasutus 's early flowering may be as important an isolating mechanism as autonomous self‐fertilization.…”

Section: Discussionmentioning

confidence: 99%

Major quantitative trait loci control divergence in critical photoperiod for flowering between selfing and outcrossing species of monkeyflower (Mimulus)

et al. 2013

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SummaryDivergence in flowering time is a key contributor to reproductive isolation between incipient species, as it enforces habitat specialization and causes assortative mating even in sympatry. Understanding the genetic basis of flowering time divergence illuminates the origins and maintenance of species barriers.We investigated the genetics of divergence in critical photoperiod for flowering between yellow monkeyflowers Mimulus guttatus (outcrosser, summer flowering) and Mimulus nasutus (selfer, spring flowering). We used quantitative trait locus (QTL) mapping of F 2 hybrids and fine-mapping in nearly isogenic lines to characterize the genomic regions underlying a > 2 h critical photoperiod difference between allopatric populations, and then tested whether the same QTLs control flowering time in sympatry.We identified two major QTLs that almost completely explain M. nasutus's ability to flower in early spring; they are shared by allopatric and sympatric population pairs. The smaller QTL is coincident with one that differentiates ecotypes within M. guttatus, but the larger effect QTL appears unique to M. nasutus.Unlike floral traits associated with mating system divergence, large interspecific differences in flowering phenology depend on only a few loci. Major critical photoperiod QTLs may be 'speciation genes' and also restrict interspecific gene flow in secondary sympatry.

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“…Consistent with drought escape, water‐limited conditions often favor earlier flowering (e.g., Bennington and McGraw ; Heschel and Riginos ; Franks et al. ; Franks ; Ivey and Carr ; but see Sherrard and Maherali ). Plant species and populations often show genetically based phenotypic differentiation consistent with patterns of differential selection and/or predictions of climatic adaptation (e.g., Dudley ,b; McKay et al.…”

Section: Introductionmentioning

confidence: 99%

Direct and indirect selection on flowering time, water‐use efficiency (WUE, δ¹³C), and WUE plasticity to drought in Arabidopsis thaliana

Kenney

McKay

Richards

et al. 2014

Ecology and Evolution

114

137

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Flowering time and water-use efficiency (WUE) are two ecological traits that are important for plant drought response. To understand the evolutionary significance of natural genetic variation in flowering time, WUE, and WUE plasticity to drought in Arabidopsis thaliana, we addressed the following questions: (1) How are ecophysiological traits genetically correlated within and between different soil moisture environments? (2) Does terminal drought select for early flowering and drought escape? (3) Is WUE plasticity to drought adaptive and/or costly? We measured a suite of ecophysiological and reproductive traits on 234 spring flowering accessions of A. thaliana grown in well-watered and season-ending soil drying treatments, and quantified patterns of genetic variation, correlation, and selection within each treatment. WUE and flowering time were consistently positively genetically correlated. WUE was correlated with WUE plasticity, but the direction changed between treatments. Selection generally favored early flowering and low WUE, with drought favoring earlier flowering significantly more than well-watered conditions. Selection for lower WUE was marginally stronger under drought. There were no net fitness costs of WUE plasticity. WUE plasticity (per se) was globally neutral, but locally favored under drought. Strong genetic correlation between WUE and flowering time may facilitate the evolution of drought escape, or constrain independent evolution of these traits. Terminal drought favored drought escape in these spring flowering accessions of A. thaliana. WUE plasticity may be favored over completely fixed development in environments with periodic drought.

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Tests for the joint evolution of mating system and drought escape in Mimulus

Abstract: The hypothesis that plant mating systems may evolve indirectly via selection on correlated life history characteristics is plausible and warrants increased attention.

Cited by 71 publications

References 78 publications

Adaptive differentiation of traits related to resource use in a desert annual along a resource gradient

Adaptive differentiation of traits related to resource use in a desert annual along a resource gradient

Major quantitative trait loci control divergence in critical photoperiod for flowering between selfing and outcrossing species of monkeyflower (Mimulus)

Direct and indirect selection on flowering time, water‐use efficiency (WUE, δ¹³C), and WUE plasticity to drought in Arabidopsis thaliana

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Tests for the joint evolution of mating system and drought escape in Mimulus

Abstract: The hypothesis that plant mating systems may evolve indirectly via selection on correlated life history characteristics is plausible and warrants increased attention.

Cited by 71 publications

References 78 publications

Adaptive differentiation of traits related to resource use in a desert annual along a resource gradient

Adaptive differentiation of traits related to resource use in a desert annual along a resource gradient

Major quantitative trait loci control divergence in critical photoperiod for flowering between selfing and outcrossing species of monkeyflower (Mimulus)

Direct and indirect selection on flowering time, water‐use efficiency (WUE, δ13C), and WUE plasticity to drought in Arabidopsis thaliana

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Direct and indirect selection on flowering time, water‐use efficiency (WUE, δ¹³C), and WUE plasticity to drought in Arabidopsis thaliana