The evolutionary history of Senna ser. Aphyllae (Leguminosae–Caesalpinioideae), an endemic clade of southern South America

Robbiati, Federico Omar; Antón, Ana M.; Marazzi, Brigitte; Vásquez‐Cruz, Marilyn; Fortunato, Renée H.

doi:10.1007/s00606-017-1450-7

Cited by 4 publications

(3 citation statements)

References 77 publications

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“…In the phylogenetic hypothesis proposed by Robbiati et al (2017b), S. aphylla s. l. is supported as polyphyletic, being S. aphylla var. aphylla an independent single evolutionary unit in one clade while the other varieties, together with S. pachyrrhiza, integrate another one, with poor resolution among taxa.…”

Section: Taxonomymentioning

confidence: 95%

“…The It is interesting to note that in the multivariate analysis (Robbiati et al, 2017a), Senna crassiramea and S. rigidicaulis appear grouped and in the phylogenetic reconstruction they appear as sister taxa but with a low support (Robbiati et al, 2017b). All these facts have led us to propose their synonymy.…”

mentioning

confidence: 91%

“…Afterwards, by means of statistical analyses of climatic and morphological data, and geographical distribution, we tried to understand the patterns of morphological variation among individuals to clarify the taxonomic delimitation of the entities involved in the series (Robbiati et al, 2017a). Furthermore, we investigated the evolutionary history of Aphyllae in a molecular phylogenetic framework (Robbiati et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

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A New Insight Into the Classification of Senna Series Aphyllae (Leguminosae)

Robbiati¹,

Antón²,

Nores³

et al. 2019

Darwiniana, nueva serie

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Robbiati, F. O.; A. M. Anton, M. J. Nores & R. H. Fortunato. 2019. A new insight into the classification of Senna Series Aphyllae (Leguminosae). Darwiniana, nueva serie 7(1): 57-64.A new classification in Senna Series Aphyllae based on distribution, morphology and phylogenetic evidences is proposed to contribute to a better comprehension of the series. Here, Senna aphylla var. divaricata and S. aphylla var. pendula are transferred to S. pachyrrhiza. Furthermore, S. rigidicaulis is considered a synonym of S. crassiramea, and a lectotype is designated for Cassia aphylla var. divaricata and C. crassiramea. Then, Series Aphyllae is composed by six species and two varieties.

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Section: Taxonomymentioning

confidence: 95%

mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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A New Insight Into the Classification of Senna Series Aphyllae (Leguminosae)

Robbiati¹,

Antón²,

Nores³

et al. 2019

Darwiniana, nueva serie

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Stability and fragmentation versus demographic expansion: different phylogeographic patterns in closely related sympatric legumes (Senna) from arid and semi-arid zones of mid-latitude South America

Robbiati

Nores

Antón

et al. 2021

Botanical Journal of the Linnean Society

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This is the first comparative research in which phylogeographical patterns and present and palaeoclimatic distribution were investigated in desert plants that inhabit the Argentinian Monte and Chaco biogeographic provinces. We investigated two closely related and partially sympatric species of legume shrubs, Senna aphylla and Senna pachyrrhiza, to contribute to understand the evolutionary history of arid plants and the impact of Quaternary climatic oscillations in these regions. We carried out phylogeographic analyses using plastid DNA accD-psa1 and rpL32-trnL sequences and reconstructed palaeodistribution by ecological niche modelling (ENM). In S. aphylla, that inhabits northern areas of the Monte, the haplotype network, demographic and spatial analyses and ENM indicated that the populations have remained demographic and spatially stable and would have undergone fragmentation in intermountain valleys and bolsons. In S. pachyrrhiza, distributed mainly along the Monte and southwestern Dry Chaco, the haplotype network presented a ‘star-like’ topology and demographic analyses and ENM supported a recent demographic expansion but no range expansion. The species diversified c. 2.5 Mya, survived Quaternary glaciations and responded differently to climatic changes, complex topography and environmental heterogeneity. The complex geological and climatic history of arid lands in mid-latitude South America provides different scenarios that promoted a mosaic of phylogeographical patterns.

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Niche conservatism, divergence and polyploidy inSennaseriesAphyllae(Fabaceae: Caesalpinioideae) from arid zones of South America

Robbiati

Cordobés

Fortunato

et al. 2022

Botanical Journal of the Linnean Society

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This paper aims to integrate cytogenetic and ecological approaches into a phylogenetic framework to better understand the evolution and systematics of Senna series Aphyllae, an endemic group of arid and semi-arid regions of South America. We counted the chromosome numbers at the population level in three species of series Aphyllae using a conventional technique (GIEMSA) and in situ hybridization (FISH). Phylogenetic reconstructions and inference of chromosome evolution were based on four plastid DNA regions and one nuclear marker. A principal component analysis was carried out using environmental data. Finally, ecological niche models (ENM) were implemented: (1) to identify the abiotic factors that constraint the potential geographical distribution of series Aphyllae and (2) to understand the ecological drivers for species diversification. The basic chromosome number is x = 12. Senna aphylla showed three cytotypes with (2n = 24, 48 and 60) and S. pachyrrhiza has two cytotypes (2n = 24 and 48). Senna crassiramea appeared to be polyploid with 2n = 48. In diploid S. pachyrrhiza, two 45S and three 5S rDNA sites were reported. In tetraploid S. crassiramea, four 45S and four 5S rDNA sites were detected. The ENM and ecological speciation tests suggest that in series Aphyllae speciation was sometimes associated with conservatism and sometimes with niche divergence. Our results contribute to the evolutionary knowledge of Neotropical legumes and understanding of drivers of diversification in arid regions in South America.

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The evolutionary history of Senna ser. Aphyllae (Leguminosae–Caesalpinioideae), an endemic clade of southern South America

Cited by 4 publications

References 77 publications

A New Insight Into the Classification of Senna Series Aphyllae (Leguminosae)

A New Insight Into the Classification of Senna Series Aphyllae (Leguminosae)

Stability and fragmentation versus demographic expansion: different phylogeographic patterns in closely related sympatric legumes (Senna) from arid and semi-arid zones of mid-latitude South America

Niche conservatism, divergence and polyploidy inSennaseriesAphyllae(Fabaceae: Caesalpinioideae) from arid zones of South America

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