Constituents of a mixed-ploidy population of Solidago altissima differ in plasticity and predicted response to selection under simulated climate change.
Am J Bot
; 106(3): 453-468, 2019 03.
Article
em En
| MEDLINE
| ID: mdl-30901496
ABSTRACT
PREMISE OF THE STUDY Polyploids possess unique attributes that influence their environmental tolerance and geographic distribution. It is often unknown, however, whether cytotypes within mixed-ploidy populations are also uniquely adapted and differ in their responses to environmental change. Here, we examine whether diploids and hexaploids from a single mixed-ploidy population of Solidago altissima differ in plasticity and potential response to natural selection under conditions simulating climate change. METHODS:
Clonal replicates of diploid and hexaploid genotypes were grown in a randomized split-plot design under two temperature (+1.9°C) and two watering treatments (-13% soil moisture) implemented with open-top passive chambers placed under rainout shelters. Physiological, phenological, morphological traits, and a fitness correlate, reproductive biomass, were measured and compared among treatments. KEYRESULTS:
Differences in traits suggest that diploids are currently better adapted to low- water availability than hexaploids. Both ploidy levels had adaptive plastic responses to treatments and are predicted to respond to selection, but often for different traits. Water availability generally had a stronger effect than temperature, but for some traits the effect of water depended on temperature.CONCLUSIONS:
Diploid and hexaploid S. altissima may maintain fitness in the short term through adaptive plasticity and evolution depending on which traits are important in a warmer, drier environment. Hexaploids may be at a disadvantage compared to diploids because fewer traits were heritable. Our results underscore the importance of studying combinations of climate variables that are predicted to change simultaneously.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Seleção Genética
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Variação Genética
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Mudança Climática
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Adaptação Fisiológica
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Solidago
Tipo de estudo:
Clinical_trials
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Prognostic_studies
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Risk_factors_studies
Idioma:
En
Revista:
Am J Bot
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Estados Unidos