Life-History Variation in Ecologically Contrasting Populations of Agrostis Stolonifera

Kik, C.; Andel, J. van; Joenje, W.

doi:10.2307/2260946

Cited by 24 publications

(21 citation statements)

References 23 publications

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“…This is in itself a novel ®nding, because it appears to be the ®rst report of genetically based variation in patterns of resource sharing between clones or populations in a clonal plant species. This adds resource sharing to the list of clonal characteristics that show genetic variation between plant species and might therefore be subject to selection, joining features of clonal architecture, architectural plasticity, ramet demography, and regulation of intraclonal competition (Lovett Doust 1981; Kik et al 1990;Turkington et al 1991;Geber et al 1992;Cheplik 1997;SkaÂ lovaÂ et al 1997). Most of the apparent dierences in resource sharing between populations and between clones within populations in Fragaria concerned vegetative reproduction, measured as accumulation of biomass in new stolons and ospring ramets.…”

Section: Discussionmentioning

confidence: 99%

Clonal integration in Fragaria chiloensis differs between populations: ramets from grassland are selfish

Alpert¹

1999

Oecologia

178

183

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In plants, only species with clonal growth are able to directly transfer resources between otherwise independent units of the same genetic individual. A simple conceptual model of plant performance as a function of internal resource supply and environmental resource availability suggests that resource sharing between ramets within clones is likely to be disadvantageous in uniform habitats and advantageous in patchy ones. It was therefore hypothesized that clones in populations from relatively uniform habitats will have been selected for low rates of resource sharing between ramets compared to clones in populations from patchier habitats. In coastal northern California, the clonal herb Fragaria chiloensis is common both in grasslands, where resources are relatively uniform, and on sand dunes, where resources are more patchy. It was predicted that clones from a grassland population of Fragaria would have "selfish" ramets with low rates of resource sharing compared to clones from an adjacent dune population. Ramets were subjected to contrasting light levels with and without connection between ramets. Patterns of biomass accumulation were consistent with the prediction. This appears to be the first report of genetically based variation in patterns of resource sharing in clonal plants. It supports the idea that these patterns are locally selected to increase plant performance in habitats with different patterns of resource availability.

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Section: Discussionmentioning

confidence: 99%

Clonal integration in Fragaria chiloensis differs between populations: ramets from grassland are selfish

Alpert¹

1999

Oecologia

178

183

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“…There are some exceptions as well as instances where phenotypic differences between diploids and established polyploids are so slight that they are of uncertain functional significance. In the grass A. stolonifera, for example, sympatric occurrences of tetraploids and hexaploids showed only trivial differences for size-related morphological traits (leaves and stolons) and growth attributes (vegetative biomass and number of stolons) despite divergence of these characteristics across populations [180,181]. Because the vast majority of ecological studies report similarities between wild autopolyploids and the neopolyploids described in the cytogenetics literature, it nonetheless seems reasonable to posit that genome duplication per se contributes to the divergence of diploids versus polyploids in many cases.…”

Section: The Modern Era (A) An Influx Of Population Biologists (1980smentioning

confidence: 99%

Ecological studies of polyploidy in the 100 years following its discovery

Ramsey

2014

Phil. Trans. R. Soc. B

250

237

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Polyploidy is a mutation with profound phenotypic consequences and thus hypothesized to have transformative effects in plant ecology. This is most often considered in the context of geographical and environmental distributions—as achieved from divergence of physiological and life-history traits—but may also include species interactions and biological invasion. This paper presents a historical overview of hypotheses and empirical data regarding the ecology of polyploids. Early researchers of polyploidy (1910s–1930s) were geneticists by training but nonetheless savvy to its phenotypic effects, and speculated on the importance of genome duplication to adaptation and crop improvement. Cytogenetic studies in the 1930s–1950s indicated that polyploids are larger (sturdier foliage, thicker stems and taller stature) than diploids while cytogeographic surveys suggested that polyploids and diploids have allopatric or parapatric distributions. Although autopolyploidy was initially regarded as common, influential writings by North American botanists in the 1940s and 1950s argued for the principle role of allopolyploidy; according to this view, genome duplication was significant for providing a broader canvas for hybridization rather than for its phenotypic effects per se . The emphasis on allopolyploidy had a chilling effect on nascent ecological work, in part due to taxonomic challenges posed by interspecific hybridization. Nonetheless, biosystematic efforts over the next few decades (1950s–1970s) laid the foundation for ecological research by documenting cytotype distributions and identifying phenotypic correlates of polyploidy. Rigorous investigation of polyploid ecology was achieved in the 1980s and 1990s by population biologists who leveraged flow cytometry for comparative work in autopolyploid complexes. These efforts revealed multi-faceted ecological and phenotypic differences, some of which may be direct consequences of genome duplication. Several classical hypotheses about the ecology of polyploids remain untested, however, and allopolyploidy—regarded by most botanists as the primary mode of genome duplication—is largely unstudied in an ecological context.

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“…Small-scale ecological differences occur between ploidy levels in Dactylis glomerata Bretagnolle & Thompson, 1996); the Holcus lanatus -Holcus molis complex (Richard et al, 1995), Paspalum hexastachyum (Quarin & Hanna, 1980), Agrostis stolonifera (Kik, Linder & Bijlsma, 1992), and Anthoxanthum odoratum (Hedberg, 1967). Small-scale ecological differentiation was not found among cytotypes of Deschampsia ce~pitosa (Rothera & Davy, 1986) or Andropogon gerardii (Keeler, 1990(Keeler, , 1992.…”

Section: Ecological and Geographic Differentiationmentioning

confidence: 96%

Population biology of intraspecific polyploidy in grasses

Keeler

1998

Population Biology of Grasses

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Life-History Variation in Ecologically Contrasting Populations of Agrostis Stolonifera

Cited by 24 publications

References 23 publications

Clonal integration in Fragaria chiloensis differs between populations: ramets from grassland are selfish

Clonal integration in Fragaria chiloensis differs between populations: ramets from grassland are selfish

Ecological studies of polyploidy in the 100 years following its discovery

Population biology of intraspecific polyploidy in grasses

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