ADAPTIVE RADIATION AND EVOLUTION OF BREEDING SYSTEMS IN SCHIEDEA (CARYOPHYLLACEAE), AN ENDEMIC HAWAIIAN GENUS<sup>1</sup>

Sakai, Ann K.; Weller, Stephen G.; Wagner, Warren L.; Nepokroeff, Molly; Culley, Theresa M.

doi:10.3417/0026-6493(2006)93[49:araeob]2.0.co;2

Cited by 57 publications

(53 citation statements)

References 55 publications

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“…For example, observations that the self-fertilizing Mimulus nasutus and serpentine-endemic Mimulus nudatus are found in drier habitats in the Weld suggest that these species are more tolerant of low soil moisture than their presumed progenitor, Mimulus guttatus (Vickery 1978;Kiang and Hamrick 1978;Macnair and Gardner 1998;Hughes et al 2001). Similar distribution patterns have been found with derived selWng species in other taxonomic groups (Gottlieb 2003;Culley et al 2006;Sakai et al 2006). At the other extreme are coastal perennial populations of M. guttatus, that unlike inland annual M. guttatus, occur in habitats where soil moisture is maintained year-round by lower temperatures and persistent fog during summer months (Hall and Willis 2006;Lowry et al 2008).…”

Section: Introductionsupporting

confidence: 66%

Natural variation for drought-response traits in the Mimulus guttatus species complex

et al. 2009

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Soil moisture is a key factor affecting plant abundance and distribution, both across and within species. In response to water limitation, plants have evolved numerous morphological, physiological, and phenological adaptations. In both well-watered and water-limited conditions, we identified considerable natural variation in drought-related whole-plant and leaf-level traits among closely related members of the Mimulus guttatus species complex that occupy a diversity of habitats in the field. The self-fertilizing Mimulus nasutus and serpentine-endemic Mimulus nudatus demonstrated the overall greatest tolerance to soil water limitation, exhibiting the smallest reduction in seed set relative to well-watered conditions. This may be due in part to early flowering, faster fruit development, and low stomatal density. In contrast, flowering of coastal M. guttatus was so delayed that it precluded any seed production in water-limited conditions. This range of phenotypic responses to soil water deficit in Mimulus, coupled with developing genomic resources, holds considerable promise for identifying genomic variation responsible for adaptive responses to soil water availability.

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Section: Introductionsupporting

confidence: 66%

Natural variation for drought-response traits in the Mimulus guttatus species complex

et al. 2009

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“…While there have been tremendous advances in our knowledge of the origin and phylogeny of Hawaiian plant and animal radiations (e.g., see Baldwin et al 1991;Givnish et al 1995;Piano et al 1997;Lindqvist et al 2003;Gillespie 2004;Price and Wagner 2004;Rundell et al 2004;Sakai et al 2006), for many of these radiations we lack the functional data necessary to understand the ecological signiWcance of phenotypic divergences seen within them. A body of work has developed on functional trait variation in Hawaiian plant radiations, notably on Euphorbia and Scaevola (Robichaux andPearcy 1980, 1984;Pearcy et al 1982), the silversword alliance (Robichaux 1984;Robichaux and CanWeld 1985;Robichaux et al 1990), and Schiedea (Sakai et al 2006). Our research on the Hawaiian lobeliads adds to this body of literature and contributes to our understanding of the extent of habitat divergence and accompanying functional diversiWcation in the most species-rich Hawaiian Xowering plant lineage.…”

Section: Discussionmentioning

confidence: 99%

Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: dynamic photosynthetic responses

Montgomery

Givnish

2008

Oecologia

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Hawaiian lobeliads have radiated into habitats from open alpine bogs to densely shaded rainforest interiors, and show corresponding adaptations in steady-state photosynthetic light responses and associated leaf traits. Shaded environments are not uniformly dark, however, but punctuated by sunflecks that carry most of the photosynthetically active light that strikes plants. We asked whether lobeliads have diversified in their dynamic photosynthetic light responses and how dynamic responses influence daily leaf carbon gain. We quantified gas exchange and dynamic light regimes under field conditions for ten species representing each major Hawaiian sublineage. Species in shadier habitats experienced shorter and less numerous sunflecks: average sunfleck length varied from 1.4 +/- 1.7 min for Cyanea floribunda in shaded forest understories to 31.2 +/- 2.1 min for Trematolobelia kauaiensis on open ridges. As expected, the rate of photosynthetic induction increased significantly toward shadier sites, with assimilation after 60 s rising from ca. 30% of fully induced rates in species from open environments to 60% in those from densely shaded habitats. Uninduced light use efficiency-actual photosynthesis versus that expected under steady-state conditions-increased from 10 to 70% across the same gradient. In silico transplants-modeling daily carbon gain using one species' photosynthetic light response in its own and other species' dynamic light regimes-demonstrated the potential adaptive nature of species differences: understory Cyanea pilosa in its light regimes outperformed gap-dwelling Clermontia parviflora, while Clermontia in its light regimes outperformed Cyanea. The apparent crossover in daily photosynthesis occurred at about the same photon flux density where dominance shifts from Cyanea to Clermontia in the field. Our results further support our hypothesis that the lobeliads have diversified physiologically across light environments in Hawaiian ecosystems and that those shifts appear to maximize the carbon gain of each species in its own environment.

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“…Among the best studied dioecious taxa, male heterogamety has evolved twice in the genus Silene (Mrackova et al 2008), twice more in the Hawaiian genus Schiedia in the same family, Caryophyllaceae (Sakai et al 2006), and twice yet again in the genus Rumex in another family (Navajas-Perez et al 2005). In all these cases, dioecy probably evolved within the past 10-15 million years (dioecy in Silene is estimated to have evolved more recently than in Rumex, and dioecious Schiedia evolved more recently still).…”

Section: Genetic Mapping Of Sex-determining Regionsmentioning

confidence: 99%

The Birds and the Bees and the Flowers and the Trees: Lessons from Genetic Mapping of Sex Determination in Plants and Animals

2010

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The ability to identify genetic markers in nonmodel systems has allowed geneticists to construct linkage maps for a diversity of species, and the sex-determining locus is often among the first to be mapped. Sex determination is an important area of study in developmental and evolutionary biology, as well as ecology. Its importance for organisms might suggest that sex determination is highly conserved. However, genetic studies have shown that sex determination mechanisms, and the genes involved, are surprisingly labile. We review studies using genetic mapping and phylogenetic inferences, which can help reveal evolutionary pattern within this lability and potentially identify the changes that have occurred among different sex determination systems. We define some of the terminology, particularly where confusion arises in writing about such a diverse range of organisms, and highlight some major differences between plants and animals, and some important similarities. We stress the importance of studying taxa suitable for testing hypotheses, and the need for phylogenetic studies directed to taxa where the patterns of changes can be most reliably inferred, if the ultimate goal of testing hypotheses regarding the selective forces that have led to changes in such an essential trait is to become feasible.

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ADAPTIVE RADIATION AND EVOLUTION OF BREEDING SYSTEMS IN SCHIEDEA (CARYOPHYLLACEAE), AN ENDEMIC HAWAIIAN GENUS¹

Cited by 57 publications

References 55 publications

Natural variation for drought-response traits in the Mimulus guttatus species complex

Natural variation for drought-response traits in the Mimulus guttatus species complex

Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: dynamic photosynthetic responses

The Birds and the Bees and the Flowers and the Trees: Lessons from Genetic Mapping of Sex Determination in Plants and Animals

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ADAPTIVE RADIATION AND EVOLUTION OF BREEDING SYSTEMS IN SCHIEDEA (CARYOPHYLLACEAE), AN ENDEMIC HAWAIIAN GENUS1

Cited by 57 publications

References 55 publications

Natural variation for drought-response traits in the Mimulus guttatus species complex

Natural variation for drought-response traits in the Mimulus guttatus species complex

Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: dynamic photosynthetic responses

The Birds and the Bees and the Flowers and the Trees: Lessons from Genetic Mapping of Sex Determination in Plants and Animals

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ADAPTIVE RADIATION AND EVOLUTION OF BREEDING SYSTEMS IN SCHIEDEA (CARYOPHYLLACEAE), AN ENDEMIC HAWAIIAN GENUS¹