Lectotypification and New Synonymy in Quercus subg. Cyclobalanopsis (Fagaceae)

Deng, Min; Zhou, Zhang; Coombes, Allen

doi:10.3417/2004208

Cited by 8 publications

(13 citation statements)

References 6 publications

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“…These leaf epidermal features have obvious taxonomic implications [e.g. the epidermal features of the species pairs Q. glauca and Quercus tranninhensis , Quercus asymmetrica and Quercus patelliformis , and Quercus brevicalyx and Quercus yingjiangensis were almost identical, supporting the recognition of Q. tranninhensis as a synonym of Q. glauca ) (Govaerts & Frodin, ), Q. patelliformis as a synonym of Q. asymmetrica , and Q. yingjiangensis as a synonym of Q. brevicalyx by Deng, Zhou & Coombes (). However, in the two specimens identified as Q. gemelliflora , papilla thickening on epidermal cells, and straight to curved anticlinal cell walls were found on the specimen Medan 45417 (Figs 174), although flat epidermal cells with prominent sinuous anticlinal cell walls were found in the specimen Kochummen , K.M.…”

Section: Discussionmentioning

confidence: 66%

Leaf epidermal features ofQuercussubgenusCyclobalanopsis(Fagaceae) and their systematic significance

Deng

Hipp

et al. 2014

Bot J Linn Soc

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Leaf epidermal features are important taxonomic features in Quercus. We studied leaf epidermal features of 91 species and one forma of Quercus subgenus Cyclobalanopsis using light and scanning electron microscopy. Trichome terminology in oaks was assessed and clarified, aiming to score the epidermal features accurately for genus-wide comparison. Nine trichome types, anomocytic and cyclocytic stomatal apparatus, smooth layer and platelet epicuticular wax flakes, and two trichome base types were found in subgenus Cyclobalanopsis. The epidermal features revealed three main groups in subgenus Cyclobalanopsis. The epidermal features of Quercus s.l. were uniform, supporting recognition of Cyclobalanopsis as a subgenus of Quercus rather than as a separate genus. Most leaf epidermal features show a mosaic pattern, although their numerous variations offered valuable resources for species identification. The leaf epidermal features that can be used for identification of Quercus leaves are also discussed and summarized.

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Section: Discussionmentioning

confidence: 66%

Leaf epidermal features ofQuercussubgenusCyclobalanopsis(Fagaceae) and their systematic significance

Deng

Hipp

et al. 2014

Bot J Linn Soc

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“…contains ~400 to 600 species (Govaerts and Frodin, 1998 ) and can be divided into the subgenera Quercus and Cyclobalanopsis , based on whether the cupule is imbricate-scaled or lamellate. The subgenus Cyclobalanopsis is one of the dominant tree taxa in evergreen broad-leaf forests (EBLFs) of eastern and southeastern Asia, with ~90 to 122 species (Govaerts and Frodin, 1998 ; Deng, 2007 ). Natural introgression is common in oaks (Valbuena-Carabaña et al, 2005 ; Curtu et al, 2007 ; Burgarella et al, 2009 ; Salvini et al, 2009 ; Ortego and Bonal, 2010 ; Moran et al, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Introgression Threatens the Genetic Diversity of Quercus austrocochinchinensis (Fagaceae), an Endangered Oak: A Case Inferred by Molecular Markers

Deng

Zheng

et al. 2017

Front. Plant Sci.

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Natural introgression can cause negative effects where rare species experience genetic assimilation and invade by their abundant congeners. Quercus austrocochinchinensis and Q. kerrii (subgenus Cyclobalanopsis) are a pair of closely related species in the Indo-China area. Morphological intermediates of the two species have been reported in this region. In this study, we used AFLP, SSR and two key leaf morphological diagnostic traits to study the two Q. austrocochinchinensis populations, two pure Q. kerrii and two putative hybrid populations in China. Rates of individual admixture were examined using the Bayesian clustering programs STRUCTURE and NewHybrids, with no a priori species assignment. In total, we obtained 151 SSR alleles and 781 polymorphic loci of AFLP markers. Population differentiation inferred by SSR and AFLP was incoherent with recognized species boundaries. Bayesian admixture analyses and principal coordinate analysis identified more hybrids and backcrossed individuals than morphological intermediates in the populations. SSR inferred a wide genetic assimilation in Q. austrocochinchinensis, except for subpopulation D2 in the core area of Xi-Shuang-Ban-Na Nature Reserve (XSBN). However, AFLP recognized more Q. austrocochinchinensis purebreds than SSR. Analysis using NewHybrids on AFLP data indicated that these hybridized individuals were few F2 and predominantly backcrosses with both parental species. All these evidences indicate the formation of a hybrid swarm at XSBN where the two species co-exist. Both AFLP and SSR recognized that the core protected area of XSBN (D2) has a high percentage of Q. austrocochinchinensis purebreds and a unique germplasm. The Hainan population and the other subpopulations of XSBN of the species might have lost their genetic integrity. Our results revealed a clear genetic differentiation in the populations and subpopulations of Q. austrocochinchinensis and ongoing introgression between Q. austrocochinchinensis and Q. kerrii at the disturbed contact areas. Combining the results from genetic and morphological analyses, the conservation of subpopulation D2 should be prioritized. Conservation and restoration of the integrity of tropical ravine rainforest is an important long-term goal for the successful conservation of Q. austrocochinchinensis. The fine-scale landscape might play an essential role in shaping the spatial patterns of hybridization. Further studies are needed to evaluate these patterns and dynamics.

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“…; Larson‐Johnson, ). The subdivisions of the family are strongly supported by both morphological and molecular data (Luo & Zhou, ; Deng, ). The Southern Hemisphere genus Nothofagus , historically included in the Fagaceae, is now placed in the separate family Nothofagaceae (Cronquist, ; Takhtajan, ; Judd et al, ; Angiosperm Phylogeny Group, ).…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we also consider it as a subgenus. The subgenus Cyclobalanopsis is suggested to be comparatively primitive within the genus Quercus based on leaf architecture, embryological and acorn morphology characters, and nuclear internal transcribed spacer sequences (Luo & Zhou, ; Deng, ).…”

Section: Introductionmentioning

confidence: 99%

An early Oligocene fossil acorn, associated leaves and pollen of the ring‐cupped oaks (Quercus subg. Cyclobalanopsis) from Maoming Basin, South China

Liu

Meng

et al. 2018

J of Sytematics Evolution

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The ring‐cupped oaks (Quercus subg. Cyclobalanopsis) characterized by united and concentric ring‐cupped acorns, are mainly distributed in broad‐leaved evergreen forests in tropical and subtropical regions of East and Southeast Asia. Their geological history has been traced from the middle Eocene to Pleistocene. Most reports of the subgenus have been on the basis of leaves, whereas the acorns or cupules, more valuable evidence for the inter‐ and intrageneric classifications, have been relatively poorly documented. Here, we describe a new species, Quercus shangcunensis sp. nov., based on a ring‐cupped fossil acorn and pollen on the acorn, as well as Quercus sp. associated leaves, recovered from the early Oligocene Shangcun Formation of Maoming Basin, Guangdong Province, South China. The morphological and anatomical structures of these fossils confirm their attribution to the subg. Cyclobalanopsis. Quercus shangcunensis sp. nov. represents the world's first Oligocene fossil acorn and the earliest fossil acorn in China for the subgenus, indicating that the subg. Cyclobalanopsis arrived in the low latitude area of South China at least by the early Oligocene. Our fossil provides evidence that the subgenus was present in one of its modern distribution centers in the Oligocene, suggesting that the modern distribution patterns of the subg. Cyclobalanopsis most likely originated during or prior to the Oligocene.

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Lectotypification and New Synonymy in Quercus subg. Cyclobalanopsis (Fagaceae)

Cited by 8 publications

References 6 publications

Leaf epidermal features ofQuercussubgenusCyclobalanopsis(Fagaceae) and their systematic significance

Leaf epidermal features ofQuercussubgenusCyclobalanopsis(Fagaceae) and their systematic significance

Introgression Threatens the Genetic Diversity of Quercus austrocochinchinensis (Fagaceae), an Endangered Oak: A Case Inferred by Molecular Markers

An early Oligocene fossil acorn, associated leaves and pollen of the ring‐cupped oaks (Quercus subg. Cyclobalanopsis) from Maoming Basin, South China

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