Environmental correlates of cytotype distribution in<i>Andropogon gerardii</i>(Poaceae)

McAllister, Christine A.; Blaine, Russell A.; Kron, Paul; Bennett, Brent; Garrett, Heidi; Kidson, Jennifer; Matzenbacher, Blanda; Glotzbach, Anna; Miller, Allison J.

doi:10.3732/ajb.1400296

Cited by 32 publications

(43 citation statements)

References 107 publications

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“…Although geographical segregation of cytotypes has long been recognized, the underlying mechanisms creating these patterns remain poorly understood (McIntyre, 2012). Ecological sorting along environmental gradients and adaptive differences among ploidy levels may trigger habitat divergence (Duchoslav et al, 2010), a possibility which can be examined quantitatively by means of common garden and/or transplant experiments (McIntyre, 2012; Godsoe et al, 2013; Theodoridis et al, 2013; Glennon et al, 2014; McAllister et al, 2015). In our field investigations, we found that diploids occupied habitats at higher altitudes than hexaploids, supporting the previously reported pattern of distribution of different C. angustifolium cytotypes (Husband and Schemske, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…The adaptive evolutionary scenario suggests that shifts in ploidy level could result in differential stress tolerances (Levin, 2002; Baack, 2004; Kubátová et al, 2008; Sonnleitner et al, 2010; McAllister et al, 2015), which may underlie the ecological divergence and adaptation of cytotypes to novel environments (Ramsey, 2011). In contrast, the environmentally independent explanations (‘non-adaptive scenarios’) posit that exclusion of minority cytotypes (Levin, 1975) and historical processes (Sonnleitner et al, 2010; McAllister et al, 2015) may be the driving force behind the observed distribution patterns. Diploid C. angustifolium inhabits higher altitudes than polyploids, and a similar pattern has also been observed in Senecio carniolicus (Sonnleitner et al, 2010; Huelber et al, 2015) and Centaurea jacea (Hardy et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…This may result in different adaptations in the different cytotypes and consequently in habitat segregation (Levin, 2004; te Beest et al, 2011), and it has long been hypothesized that polyploids may be able to occupy harsher environments relative to diploids because of the advantages of polyploidy (Grant, 1981; Levin, 1983). Observations supporting this hypothesis suggest that polyploids are common in alpine regions, arctic areas (Brochmann et al, 2004) and other ecologically extreme environments (Ramsey, 2011; Manzaneda et al, 2012; Hao et al, 2013; McAllister et al, 2015). However, many examples suggest that the frequency of diploids also tends to increase with altitude (Hardy et al, 2000; Sonnleitner et al, 2010) or latitude (Ricca et al, 2008), indicating that diploids may be more tolerant of certain stressful conditions (Buggs and Pannell, 2007; Visser and Molofsky, 2015).…”

Section: Introductionmentioning

confidence: 91%

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Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya–Hengduan Mountains Region

et al. 2016

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Polyploid species generally occupy harsher habitats (characterized by cold, drought and/or high altitude) than diploids, but the converse was observed for Chamerion angustifolium, in which diploid plants generally inhabit higher altitudes than their polyploid derivatives. Plants at high altitudes may experience cold-induced water stress, and we therefore examined the physiological responses of diploid and hexaploid C. angustifolium to water stress to better understand the ecological differentiation of plants with different ploidy levels. We conducted a common garden experiment by subjecting seedlings of different ploidy levels to low, moderate, and severe water stress. Fourteen indicators of physiological fitness were measured, and the anatomical characteristics of the leaves of each cytotype were determined. Both cytotypes were influenced by drought, and diploids exhibited higher fitness in terms of constant root:shoot ratio (R:S ratio) and maximum quantum yield of PS II (Fv/Fm), less reduced maximal photosynthetic rate (Amax), transpiration rate (E), intercellular CO2 concentration (Ci) and stomatal conductance (gs), and higher long-term water use efficiency (WUEL) under severe water stress than did hexaploids. Analysis of leaf anatomy revealed morphological adjustments for tolerating water deficiency in diploids, in the form of closely packed mesophyll cells and small conduits in the midvein. Our results indicate that diploid C. angustifolium is more tolerant of drought than hexaploid plants, ensuring the successful survival of the diploid at high altitudes. This eco-physiological divergence may facilitate the species with different cytotypes to colonize new and large geographic ranges with heterogeneous environmental conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

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Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya–Hengduan Mountains Region

et al. 2016

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“…However, the evidence for climatic or ecological niche differentiation between different cytotypes of a species is still inconclusive. While some studies have found correlations between cytotype distribution and climate variables and differences in habitat conditions between cytotypes (e.g., Raabová et al., ; Kolář et al., ; Sonnleitner et al., ; Ramsey, ; Richardson and Hanks, ; Mráz et al., ; McAllister et al., ; Visger et al., ; Muñoz‐Pajares et al., ), others have found evidence for shared broad‐scale climatic niches between cytotypes and no evidence for differences in climatic requirements (Godsoe et al., ; Glennon et al., and references therein). Ideally, the study of niche differentiation would include experiments testing the effects of environmental factors on different cytotypes, but there are not many studies involving such experiments (Ramsey, ; Kolář et al., ; McIntyre and Strauss, ).…”

mentioning

confidence: 99%

Ecological niche differences between two polyploid cytotypes ofSaxifraga rosacea

Decanter

Colling

Elvinger

et al. 2020

American J of Botany

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Premise Different cytotypes of a species may differ in their morphology, phenology, physiology, and their tolerance of extreme environments. We studied the ecological niches of two subspecies of Saxifraga rosacea with different ploidy levels: the hexaploid Central European endemic subspecies sponhemica and the more widely distributed octoploid subspecies rosacea. Methods For both cytotypes, we recorded local environmental conditions and mean plant trait values in populations across their areas of distribution, analyzed their distributions by niche modeling, studied their performance at two transplant sites with contrasting conditions, and experimentally tested their cold resistance. Results Mean annual temperature was higher in hexaploid than in octoploid populations and experiments indicated that frost tolerance of the hexaploid is lower than that of the octoploid. Reproduction of octoploids from Central Europe was higher than that of hexaploids at a transplant site in subarctic Iceland, whereas the opposite was true in temperate Luxembourg, indicating adaptation of the octoploids to colder conditions. Temperature variables were also most important in niche models predicting the distribution of the two cytotypes. Genetic differences in survival among populations were larger for the octoploids than for the hexaploids in both field gardens, suggesting that greater genetic variability may contribute to the octoploid's larger distributional range. Conclusions Our results support the hypotheses that different cytotypes may have different niches leading to spatial segregation, and that higher ploidy levels can result in a broader ecological niche and greater tolerance of more extreme conditions.

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“…) and that it remains an active evolutionary and ecological process in many lineages (Ramsey ; Soltis & Soltis ; Ramsey & Ramsey ; McAllister et al . ; Wendel ).…”

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confidence: 99%

Insights into the Ecology and Evolution of Polyploid Plants through Network Analysis

Gallagher

Grover

et al. 2016

Molecular Ecology

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Polyploidy is a widespread phenomenon throughout eukaryotes, with important ecological and evolutionary consequences. Although genes operate as components of complex pathways and networks, polyploid changes in genes and gene expression have typically been evaluated as either individual genes or as a part of broad-scale analyses. Network analysis has been fruitful in associating genomic and other 'omic'-based changes with phenotype for many systems. In polyploid species, network analysis has the potential not only to facilitate a better understanding of the complex 'omic' underpinnings of phenotypic and ecological traits common to polyploidy, but also to provide novel insight into the interaction among duplicated genes and genomes. This adds perspective to the global patterns of expression (and other 'omic') change that accompany polyploidy and to the patterns of recruitment and/or loss of genes following polyploidization. While network analysis in polyploid species faces challenges common to other analyses of duplicated genomes, present technologies combined with thoughtful experimental design provide a powerful system to explore polyploid evolution. Here, we demonstrate the utility and potential of network analysis to questions pertaining to polyploidy with an example involving evolution of the transgressively superior cotton fibres found in polyploid Gossypium hirsutum. By combining network analysis with prior knowledge, we provide further insights into the role of profilins in fibre domestication and exemplify the potential for network analysis in polyploid species.

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Environmental correlates of cytotype distribution inAndropogon gerardii(Poaceae)

Cited by 32 publications

References 107 publications

Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya–Hengduan Mountains Region

Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya–Hengduan Mountains Region

Ecological niche differences between two polyploid cytotypes ofSaxifraga rosacea

Insights into the Ecology and Evolution of Polyploid Plants through Network Analysis

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