Evolutionary Transition from Resprouter to Seeder Life History in Two Erica (Ericaceae) Species: Insights from Seedling Axillary Buds

Verdaguer, Dolors; Ojeda, Fernando

doi:10.1093/aob/mci061

Cited by 34 publications

(37 citation statements)

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“…This microevolutionary (within species) approach thus illustrates how a regime of recurrent fires can promote diversification in seeder lineages of the genus Erica. However, Segarra-Moragues and Ojeda (2010) were not able to provide genetic evidence for the suspected ancestrality (based on ontogenetic characters; Verdaguer and Ojeda 2005) of the resprouter form, nor shed light on Fig. 1 Geographic distribution of Erica coccinea populations used in this study indicating the proportion of seeder (light grey) and resprouter (dark grey) regeneration forms.…”

Section: Introductionmentioning

confidence: 78%

“…Thus, the derived seeder state can be interpreted as the result of an ontogenetic loss of the resprouting ability (Verdaguer and Ojeda 2005), likely as a consequence of a loss-of-function mutation. The 'mutant' seeder phenotype would have replaced an originally resprouter population under particular environmental conditions associated with a stable, mild Mediterranean climate , characteristic of the southwestern CFR at least since the early Pleistocene .…”

Section: Discussionmentioning

confidence: 99%

“…It is one of the few 'mixed' Erica species, with distinct seeder and resprouter forms (Ojeda 1998;Bell and Ojeda 1999), which occur frequently-but not always-in allopatry. These two phenotypic forms have a genetic determinism Ojeda 2002, 2005), and ontogenetic evidence indicates that the seeder form is derived from the resprouter form (Verdaguer and Ojeda 2005). Both seeder and resprouter populations of E. coccinea are common in fynbos communities of coastal mountains and hills of the southwestern CFR, whereas seeder populations are scarce to absent in more inland mountains (Fig.…”

Section: Introductionmentioning

confidence: 98%

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Biogeography and evolution of seeder and resprouter forms of Erica coccinea (Ericaceae) in the fire-prone Cape fynbos

et al. 2015

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The genus Erica represents the epitome of plant biodiversity in the South African Cape fynbos with over 700 species. This genus is composed of seeder and resprouter species, but both species diversity and endemism are strongly linked to the seeder habit and concentrated in the southwestern Cape Floristic Region (CFR). Erica coccinea is a relatively abundant and widespread fynbos species whose most remarkable morphological feature is the existence of distinct seeder and resprouter forms, frequently-but not always-in disjunct populations. Both higher within-population genetic diversity and among-population differentiation have been found in seeders, most likely as a consequence of the shorter generation times and faster population turnovers. Resprouters, despite being less diverse, are suspected to be ancestral. However, no solid evidence has yet been provided for the ancestrality of the resprouter form, or for the demographic processes that have determined the current distribution of genetic diversity in both regeneration forms. Here, we used microsatellites and sequences of the nuclear ribosomal internal transcribed spacers to describe the phylogeographic structure of seeder and resprouter E. coccinea populations and provide good evidence for the ancestral status of the resprouter form and the comparatively Published in "Plant Ecology 217(6): 751-761, 2015" which should be cited to refer to this work.high rates of molecular evolution in derived seeder populations. We also reveal that mixed populations, where both seeder and resprouter individuals cooccur, were originated by secondary contacts. This study highlights the role of fire in driving accelerated diversification in seeder lineages of highly speciose CFR fynbos taxa.

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Section: Introductionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Biogeography and evolution of seeder and resprouter forms of Erica coccinea (Ericaceae) in the fire-prone Cape fynbos

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“…Similarly, lignotuber buds of Quercus suber are not originated at the cotyledonary axil, but between the cotyledon petioles and the embryonic axis in the fused (and enlarged) portion of the cotyledonary node (Molinas and Verdaguer 1993a). In lignotuberous Erica species, the meristematic potential of the lignotuber is probably generated by the accumulation of axillary buds of basal branches that progressively merge to a conspicuous lignotuber (Verdaguer and Ojeda 2005). Therefore, there is no unique ontogenetic program for the development of cluster buds.…”

Section: Morpho-anatomical Key Traits In Early Lignotubersmentioning

confidence: 99%

“…Hybridisation experiments in Myrtaceae species indicate that lignotubers are dominantly inherited and are under multigenic control (Pryor and Byrne 1969;Shepherd et al 2008). Accordingly, intraspecific comparisons of the progeny of lignotuberous and non-lignotuberous forms of Eucalyptus and Erica species indicate that lignotuber development depends on the presence of these structures in the parent plants Verdaguer and Ojeda 2005). Contrarily, the swollen root crown that appears in some other resprouting species (named stump or burl, and sometimes incorrectly called lignotuber) is induced by multiple resprouting events and is not genetically determined (James 1984).…”

Section: Introductionmentioning

confidence: 99%

Lignotubers in Mediterranean basin plants

et al. 2015

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Lignotubers are swollen woody structures located at the root-shoot transition zone and contain numerous dormant buds and starch reserves. This structure enables the plant to resprout prolifically after severe disturbances that remove the aboveground biomass. These are considered adaptive traits in ecosystems with highly frequent and severe disturbances-such as fire-prone ecosystems. In this paper, we aim to contribute to the knowledge of lignotubers in the Mediterranean basin and highlight the evolutionary implications. We first summarise existing knowledge on lignotuber species in the Mediterranean basin. We then provide a detailed morpho-anatomical description of early lignotubers in two common woody species (Arbutus unedo L. and Phillyrea angustifolia L.). Finally, we compare our anatomical results with those obtained in studies conducted with other lignotuberous species from different Mediterranean regions. Lignotubers were verified in 14 species in the Mediterranean basin; all being from lineages with origins dating to the Tertiary and thus pre-dating the Mediterranean climate. In A. unedo and P. angustifolia, lignotubers are macroscopically discernible in 4-and 2-year-old saplings, respectively. In these two species, the lignotubers have numerous buds protected by hypertrophied scales, and have a contorted xylem containing abundant starch. Our results challenge the traditional idea that pre-Mediterranean lineages suffered evolutionary inertia; instead, lignotuberous species may be considered examples of plants that adapted to the increased fire activity that occurred throughout the Tertiary and Quaternary. We also highlight the use of morpho-anatomical traits to unambiguously distinguish between lignotuberous and non-lignotuberous resprouting species.

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Ecological divergence and evolutionary transition of resprouting types inBanksia attenuata

2014

Ecology and Evolution

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Resprouting is a key functional trait that allows plants to survive diverse disturbances. The fitness benefits associated with resprouting include a rapid return to adult growth, early flowering, and setting seed. The resprouting responses observed following fire are varied, as are the ecological outcomes. Understanding the ecological divergence and evolutionary pathways of different resprouting types and how the environment and genetics interact to drive such morphological evolution represents an important, but under-studied, topic. In the present study, microsatellite markers and microevolutionary approaches were used to better understand: (1) whether genetic differentiation is related to morphological divergence among resprouting types and if so, whether there are any specific genetic variations associated with morphological divergence and (2) the evolutionary pathway of the transitions between two resprouting types in Banksia attenuata (epicormic resprouting from aerial stems or branch; resprouting from a underground lignotuber). The results revealed an association between population genetic differentiation and the morphological divergence of postfire resprouting types in B. attenuata. A microsatellite allele has been shown to be associated with epicormic populations. Approximate Bayesian Computation analysis revealed a likely evolutionary transition from epicormic to lignotuberous resprouting in B. attenuata. It is concluded that the postfire resprouting type in B. attenuata is likely determined by the fire's characteristics. The differentiated expression of postfire resprouting types in different environments is likely a consequence of local genetic adaptation. The capacity to shift the postfire resprouting type to adapt to diverse fire regimes is most likely the key factor explaining why B. attenuata is the most widespread member of the Banksia genus.

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Evolutionary Transition from Resprouter to Seeder Life History in Two Erica (Ericaceae) Species: Insights from Seedling Axillary Buds

Cited by 34 publications

References 29 publications

Biogeography and evolution of seeder and resprouter forms of Erica coccinea (Ericaceae) in the fire-prone Cape fynbos

Biogeography and evolution of seeder and resprouter forms of Erica coccinea (Ericaceae) in the fire-prone Cape fynbos

Lignotubers in Mediterranean basin plants

Ecological divergence and evolutionary transition of resprouting types inBanksia attenuata

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