Reproductive isolation between diploid and tetraploid cytotypes of Libidibia ferrea (= Caesalpinia ferrea) (Leguminosae): ecological and taxonomic implications

Borges, Laís Angélica; Souza, Gustavo; Guerra, Marcelo; Machado, Isabel Cristina; Lewis, Gwilym P.; Lopes, Ariadna Valentina

doi:10.1007/s00606-012-0643-3

Cited by 38 publications

(32 citation statements)

References 29 publications

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“…Crossing barriers have profound impacts on the fate of neopolyploid mutants, and it is understandable that polyploid speciation is viewed principally in the context of post-zygotic reproductive barriers. On the other hand, established polyploids appear to be reproductively isolated from their diploid progenitors by multiple components of pre-and post-zygotic mechanisms, including environmentally mediated barriers like habitat isolation, flowering phenology and pollinator behaviour [150,151,170,188,208,210,211]. It is unclear to what extent these reproductive barriers are achieved immediately following genome duplication; arguably this is the critical issue for evaluating polyploidy as an agent of ecological versus nonecological speciation.…”

Section: Long-standing Questions About Polyploid Ecology and Their Fumentioning

confidence: 99%

“…On the other hand, morphological and phenological changes associated with genome duplicationpotentially including increased flower size, altered nectar and pollen rewards, and delayed flowering-may influence flower visitation rates and geitonogomy, and hence outcrossing rates [188,244]. The phenotypic effects of polyploidization may also lead to specialization of pollinator species to particular cytotypes, or constancy of pollinator visitation to particular cytotypes during foraging bouts, and thus pre-zygotic reproductive isolation in sympatry [151,188,194,[209][210][211].…”

Section: (B) Broadening Horizons (2000s To Present)mentioning

confidence: 99%

“…By the early 2010s, the floodgates had opened and ecological studies were published about polyploid complexes in more than a dozen other genera. For the most part, the emphasis of recent projects is on classical questions in polyploid ecology, but the diversity of topics and methodological approaches is impressive-the work encompasses analyses of spatial and environmental distributions of cytotypes, including niche modelling [75,147,[195][196][197][198][199][200][201][202][203][204][205][206]; gene flow and reproductive barriers, including ecologically mediated components of isolation [151,[207][208][209][210][211]; detailed phenotypic and fitness measurements of plants in natural habitats [212][213][214][215][216][217][218][219]; phenotypic attributes of plants cultured in controlled greenhouse or garden conditions [29][30][31]143,150,[220][221][222][223][224][225][226]; and field transplant experiments [14,[227][228]…”

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

confidence: 99%

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Ecological studies of polyploidy in the 100 years following its discovery

Ramsey

2014

Phil. Trans. R. Soc. B

247

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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Section: Long-standing Questions About Polyploid Ecology and Their Fumentioning

confidence: 99%

Section: (B) Broadening Horizons (2000s To Present)mentioning

confidence: 99%

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

confidence: 99%

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Ecological studies of polyploidy in the 100 years following its discovery

Ramsey

2014

Phil. Trans. R. Soc. B

247

237

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“…demonstram que as mesmas possuem um sistema especialista ou recebem significativas visitas, principalmente de Xylocopa sp. (Van Der Pijl, 1954;Arroyo, 1981;Gottsberger & SilberbauerGottsberger, 1988;Aguiar et al, 2003;Leite & Machado, 2009;Borges et al, 2009;Borges et al, 2012;Raju et al, 2016). Em adição, estudos com espécies da subtribo Cassiinae no cerrado, que apresentavam barreiras morfológicas para autopolinização, necessitavam de um grupo de abelhas para realizar a polinização de forma eficiente, sendo estas distribuídas nos gêneros Xylocopa, Centris e Bombus (Nascimento & DelClaro, 2007;Almeida et al, 2013;Almeida et al, 2015).…”

Section: Biologia Floral E Sistema De Polinizaçãounclassified

“…Um exemplo de autoincompatibilidade foi estudado em C. Pyramidalys por Leite & Machado (2009), em Caesalpinia echinata Lam. por Borges et al (2009), em Libidibia ferrea por Borges et al (2012) e em Vatairea macrocarpa (Benth.) por Costa (2014), os quais afirmam que na polinização cruzada manual e natural, a formação de frutos foi baixa em relação à quantidade de flores produzidas, porém a média da produção de sementes está próxima à quantidade de óvulos produzidos.…”

Section: Sistema Reprodutivounclassified

Biologia floral e reprodutiva de Cenostigma macrophyllum Tul. (Fabaceae) no Parque Zoobotânico de Teresina, Piauí

Aguiar

Soares

Masrua

et al. 2016

J. Env. Anal. Progr.

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A B S T R A C T Cenostigma macrophyllumTul. is popularly known as caneleiro, has an arboreal habit, stem ridged, considered plant symbol of the capital Teresina (PI). The objective of this study was to investigate the floral and reproductive biology of Cenostigma macrophyllum the Zoobotanical Park of Teresina, Piauí. We selected 15 individuals and analyzed for morphology and floral morphometry, anthesis period, stigmatic receptivity, anther dehiscence, nectar volume behavior of floral visitors in the effectiveness of pollination and reproductive system. The flowers are hermaphrodite, have about 81.28±25.74 flowers per racemose inflorescence. Nectar produced and stored in hypanthium with an average production of 1.75 μL. The floral anthesis lasted two days, with fully distended petals at 6 AM, receptive stigma 7 AM and dehiscence-starting 9 AM, opening in groups throughout the day. The pollinators and thief began visits around 6 AM until 17 PM flowers the first day of anthesis foraging in search of nectar. The effective pollinators were bees, more frequently (64%), Xylocopa spp., Apis mellifera and Centris sp., which used the standard petal to access the nectar. Occasional pollinators were Lepidoptera with no touch always the reproductive parts. The thief, Trigona spinipes bees and hummingbird Amazilia Fimbriata that did not touch the reproductive organs to collect nectar. The species is xenogamic and presents reproductive dichogamy and protoginic system because occurs the temporal separation of maturation of the reproductive structures. Treatment of mechanical scarification is a higher potential for a rapid seed germination. Keywords: Pollination, anthesis, dichogamy. R E S U M OCenostigma macrophyllum Tul. é conhecido, popularmente, como caneleiro, possui hábito arbóreo, caule sulcado, sendo considerada planta símbolo da capital Teresina (PI). O objetivo deste trabalho foi investigar a biologia floral e Reprodutiva de Cenostigma macrophyllum no Parque Zoobotânico de Teresina, Piauí. Foram selecionados 15 indivíduos e analisados quanto à morfologia e morfometria floral, período de antese, receptividade estigmática, deiscência das anteras, volume de néctar, comportamento dos visitantes florais na eficácia da polinização e o sistema reprodutivo. As flores são monóclinas, dispõem-se em cerca de 81,28±25,74 flores por inflorescência racemosa. Néctar produzido e armazenado no hipanto com produção média de 1,75 μL. A antese floral teve duração de dois dias, com pétalas totalmente distendidas às 6h, estigma receptivo às 7h e deiscência iniciando às 9h,

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Autopolyploid lineage shows climatic niche expansion but not divergence inArabidopsis arenosa

Molina-Henao

Hopkins

2019

American J of Botany

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Premise of the Study Successful establishment of neopolyploids, and therefore polyploid speciation, is thought to be contingent on environmental niche shifts from their progenitors. We explore this niche shift hypothesis in the obligate outcrosser Arabidopsis arenosa complex, which includes diploid and recently formed autotetraploid populations. Methods To characterize the climatic niches for both cytotypes in Arabidopsis arenosa, we first gathered climatic data from localities with known ploidy types. We then estimated the climatic niches for diploids and autotetraploids and calculated niche overlap. Using this niche overlap statistic, we tested for niche equivalency and similarity. We explored differences in niches by estimating and comparing niche optimum and breadth and then calculated indices of niche expansion and unfilling. Key Results Climatic niche overlap between diploids and autotetraploids is substantial. Although the two niche models are not significantly divergent, they are not identical as they differ in both optimum and breadth along two environmental gradients. Autotetraploids fill nearly the entire niche space of diploids and have expanded into novel environments. Conclusions We find climatic niche expansion but not divergence, together with a moderate change in the niche optimum, in the autotetraploid lineage of Arabidopsis arenosa. These results indicate that the climatic niche shift hypothesis alone cannot explain the coexistence of tetraploid and diploid cytotypes.

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Reproductive isolation between diploid and tetraploid cytotypes of Libidibia ferrea (= Caesalpinia ferrea) (Leguminosae): ecological and taxonomic implications

Cited by 38 publications

References 29 publications

Ecological studies of polyploidy in the 100 years following its discovery

Ecological studies of polyploidy in the 100 years following its discovery

Biologia floral e reprodutiva de Cenostigma macrophyllum Tul. (Fabaceae) no Parque Zoobotânico de Teresina, Piauí

Autopolyploid lineage shows climatic niche expansion but not divergence inArabidopsis arenosa

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