Phenotypic differences are not explained by pre-zygotic reproductive barriers in sympatric varieties of the Humiria balsamifera complex (Humiriaceae)

Holanda, Ana Sofia Sousa de; Vicentini, Alberto; Hopkins, Michael John Gilbert; Zartman, Charles E.

doi:10.1007/s00606-014-1191-9

Cited by 9 publications

(17 citation statements)

References 49 publications

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“…Orchids are typically characterized by low levels of population genetic differentiation. Phenotypic variations may not always reflect real genetic variations 32 . For D. tosaense , exiguous phenotypic differences between two species could have resulted from rapid radiation 33 .…”

Section: Discussionmentioning

confidence: 99%

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Iteration expansion and regional evolution: phylogeography of Dendrobium officinale and four related taxa in southern China

Hou

Luo

Zhang

et al. 2017

Sci Rep

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The genus Dendrobium was used as a case study to elucidate the evolutionary history of Orchidaceae in the Sino-Japanese Floristic Region (SJFR) and Southeast Asia region. These evolutionary histories remain largely unknown, including the temporal and spatial distribution of the evolutionary events. The present study used nuclear and plastid DNA to determine the phylogeography of Dendrobium officinale and four closely related taxa. Plastid DNA haplotype and nuclear data were shown to be discordant, suggesting reticulate evolution drove the species’ diversification. Rapid radiation and genetic drift appeared to drive the evolution of D. tosaense and D. flexicaule, whereas introgression or hybridization might have been involved in the evolution of D. scoriarum and D. shixingense. The phylogeographical structure of D. officinale revealed that core natural distribution regions might have served as its glacial refuges. In recent years, human disturbances caused its artificial migration and population extinction. The five taxa may have originated from the Nanling Mountains and the Yungui Plateau and then migrated northward or eastward. After the initial iteration expansion, D. officinale populations appeared to experience the regional evolutionary patterns in different regions and follow the sequential or rapid decline in gene exchange.

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Section: Discussionmentioning

confidence: 99%

“…Gene flow barriers are considered the most definitive evidence for species delimitations 32 . Compared with D. officinale, D. flexicaule resides at higher latitudes and is not in sympatric distribution with the other related species, which might have reduced the levels of interspecific gene flow.…”

Section: Discussionmentioning

confidence: 99%

Iteration expansion and regional evolution: phylogeography of Dendrobium officinale and four related taxa in southern China

Hou

Luo

Zhang

et al. 2017

Sci Rep

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“…Disporangiate-dithecal anthers are often correlated with specialized floral biology, which can be enabled by restrictive anther openings such as valves (Endress and Stumpf 1990). The pollination biology of Humiriaceae has been only carefully studied for Humiria balsamifera (Holanda et al 2015), and indicated bee pollination of its nectariferous flowers. For the valvate taxa (i.e., all except Vantanea), further study is needed to see if the anther valves constrain pollen release.…”

Section: Broader Significance Of Androecial Structure In Humiriaceaementioning

confidence: 99%

“…Stamen connation can affect pollinator nectar access by forming a tube around the disc that varies in height among genera and species (e.g., Sacoglottis spp., Table 2), although nectar robbing by piercing the tube is known for Humiria (Holanda et al 2015). Anthesis is likely generally of short duration based on the morphology patterns of versatile, caducous anthers and delicate stigmas, although this has been directly little studied (Holanda et al 2015).…”

Section: Broader Significance Of Androecial Structure In Humiriaceaementioning

confidence: 99%

Insights on the systematics and morphology of Humiriaceae (Malpighiales): androecial and extrafloral nectary variation, two new combinations, and a new Sacoglottis from Guyana

Wurdack

Zartman²

2019

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Humiriaceae have had little recent comparative morphological study except for their distinctive fruits. We surveyed the diversity of stamen structures in the family with consideration of dehiscence patterns and the evolutionary transitions between tetra- and disporangiate anthers. Novel interpretations of floral morphology support new combinations (Duckesialiesneri K.Wurdack & C.E.Zartman, comb. nov. and Vantaneaspiritu-sancti K.Wurdack & C.E.Zartman, comb. nov.) for two species formerly in Humiriastrum. We investigated all eleven species of Sacoglottis for diagnostic features that may contribute to better species delimitations, and describe Sacoglottisperryi K.Wurdack & C.E.Zartman, sp. nov. as an endemic of the Pakaraima Mountains in western Guyana. Finally, our survey across Humiriaceae for extrafloral nectaries (EFNs) revealed their presence on leaves of all extant species as adaxial basilaminar and/or abaxial embedded glands, in addition to the frequent occurrence of marginal glandular setae. The significance of inter-generic variation in gland position and anther morphology within the family are discussed.

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“…Tropical species complexes distributed across continental scales are common (Thorne 1972;Pinheiro et al 2018). Advances in DNA sequencing in conjunction with biosystematic studies have shed light on mechanisms which contribute to recent divergences within some Amazonian complexes (e.g., Esteves & Vicentini (2013): Pagamea coriacea, Holanda et al (2015): two sympatric varieties of the H. balsamifera complex, Dexter et al (2017): Inga (Fabaceae), Prata et al (2018): Pagamea guianensis (Rubiaceae), and Damasco et al (2019): Protium cordatum (Burseraceae)). However, little remains known as to how phenotypic and phylogenetic variation are correlated among the vast majority of Neotropical complexes.…”

Section: Introductionmentioning

confidence: 99%

Quantitative morphometrics suggest that the widespread Neotropical Humiria balsamifera (Aubl.) St. Hil. is a species complex

et al. 2021

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Humiria balsamifera is an infraspecific complex of high phenotypic variation and widely distributed in northern South America. Leaf traits are traditionally considered the most relevant taxonomic characters for varietal level delimitation in the group. However, substantial phenotypic overlap among vegetative characters complicates taxonomic diagnoses in this complex. The objective of this study was to quantify and analyze phenotypic variation among individuals of the complex at a continental scale using uni-and multivariable analyses to assess whether morphometric analyses detect discontinuities. Secondarily, these quantitative data were used to test whether phenotypic similarity was related to geographic distance. Twenty-five quantitative and 27 qualitative character traits did not overtly reveal a topology corresponding to traditional varietal classification, nor to geographic structure. However, petiole length alone revealed a definitive separation of H. balsamifera var. guianensis (together with another recognized species Humiria wurdackii, and variety H. balsamifera var. laurina) from the rest of the taxa. Our results highlight substantial morphological overlap among vegetative and reproductive characters including those used in identification keys, and no morphological discontinuities suitable for clearly separating taxa within the complex were encountered demonstrating a future need to integrate multiple sources of information, including molecular data, to resolve this complex.

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Phenotypic differences are not explained by pre-zygotic reproductive barriers in sympatric varieties of the Humiria balsamifera complex (Humiriaceae)

Cited by 9 publications

References 49 publications

Iteration expansion and regional evolution: phylogeography of Dendrobium officinale and four related taxa in southern China

Iteration expansion and regional evolution: phylogeography of Dendrobium officinale and four related taxa in southern China

Insights on the systematics and morphology of Humiriaceae (Malpighiales): androecial and extrafloral nectary variation, two new combinations, and a new Sacoglottis from Guyana

Quantitative morphometrics suggest that the widespread Neotropical Humiria balsamifera (Aubl.) St. Hil. is a species complex

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