Leaf epidermal features of<i>Quercus</i>subgenus<i>Cyclobalanopsis</i>(Fagaceae) and their systematic significance

Deng, Min; Hipp, Andrew L.; Li, Qiansheng; Coombes, Allen; Cotton, Alexa

doi:10.1111/boj.12207

Cited by 38 publications

(49 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar mismatches between traditional classification and DNA-based groups are encountered for all large infrageneric groups and will pose a major challenge when searching for morphological criteria to subdivide sections within oaks. For example, while it has long been noticed that characters of the indumentum of the abaxial leaf surface provide valuable information for species delimitation (Manos 1993;Nixon 2002;Tschan and Denk 2012;Deng et al 2015Deng et al , 2017, these characters appear to have evolved convergently in related and unrelated groups (Tschan and Denk 2012;Deng et al 2017).…”

Section: Infrasectional Classification: the Big Challengementioning

confidence: 99%

An updated infrageneric classification of the oaks: review of previous taxonomic schemes and synthesis of evolutionary patterns

Denk¹,

Grimm²,

Manos³

et al. 2017

Preprint

Self Cite

102

View full text Add to dashboard Cite

Lobatae (red oaks) and Group Quercus (white oaks, with most species in America and some 30 species in Eurasia). The main morphological feature characterising these phylogenetic lineages is pollen morphology, a character overlooked in traditional classifications. This realisation, along with the now available (molecular-)phylogenetic framework, opens new avenues for biogeographic, ecological and evolutionary studies and a re-appraisal of the fossil record. We provide an overview about recent advances in these fields and outline how the results of these studies contribute to the establishment of a unifying systematic scheme of . CC-BY-ND 4.0 International license not peer-reviewed) is the author/funder. It is made available under a

show abstract

Section: Infrasectional Classification: the Big Challengementioning

confidence: 99%

An updated infrageneric classification of the oaks: review of previous taxonomic schemes and synthesis of evolutionary patterns

Denk¹,

Grimm²,

Manos³

et al. 2017

Preprint

Self Cite

102

View full text Add to dashboard Cite

show abstract

“…Although the Flora of China and other regional floristic works had been finished for decades (e.g., Huang et al, 1999 ; Phengklai et al, 2008 ), the oak taxonomy and their systematic placement are still not well resolved, in part due to the high level of intra- and inter-species genetic variation. Even the fine anatomy features of the East Asian evergreen oaks, such as leaf epidermal features ( Deng et al, 2014 , 2017b ), pollen morphology ( Denk and Grimm, 2009 ; Deng et al, 2013b ; Denk and Tekleva, 2014 ), and wood anatomy ( Zhao et al, 2007 ) had been comprehensively studied in recent years. But these works do not provide useful diagnostic features to clarify species identity, and suggest paraphyletic evolution of taxonomical traits.…”

Section: Introductionmentioning

confidence: 99%

The Application and Limitation of Universal Chloroplast Markers in Discriminating East Asian Evergreen Oaks

et al. 2018

Self Cite

View full text Add to dashboard Cite

The East Asian subtropics mostly occupied by evergreen broad-leaved forests (EBLFs), is one of the global diversity centers for evergreen oaks. Evergreen oaks are keystone canopy trees in EBLFs with important ecosystem function and crucial significance for regional biodiversity conservation. However, the species composition and diversity of Asian evergreen oaks are poorly understood. Here, we test whether the four chloroplast markers atpI-atpH, matK, psbA-trnH, and ycf1, can discriminate the two evergreen oak sections in Asia – Cyclobalanopsis and Ilex. Two hundred and seventy-two individuals representing 57 species were scanned and 17 species from other oaks sections were included for phylogenetic reconstruction. The genetic diversity of the Quercus sections was also compared. Overall, we found that universal chloroplast DNA (cpDNA) barcoding markers could resolve two clades in Quercus, i.e., subgenus Cerris (Old World Clade) and subgenus Quercus (New World Clade). The chloroplast markers distinguished the main sections, with few exceptions. Each cpDNA region showed no barcoding gap and none of them provided good resolution at the species level. The best species resolution (27.78%) was obtained when three or four markers were combined and analyzed using BLAST. The high conservation of the cpDNA and complicated evolutionary patterns, due to incomplete lineage sorting, interspecific hybridization and introgressions may hinder the ability of cpDNA markers to discriminate different species. When comparing diversification pattern across Quercus sections (Cyclobalanopsis, Ilex, Cerris, Quercus, and Protobalanus), we found that section Ilex was the most genetically diverse, and section Cyclobalanopsis was lower genetically diverse. This diversification pattern may have resulted from the interplay of the Eurasia Cenozoic tectonic movements, climate changes and different niches of their ancestral lineages.

show abstract

“…0.1643 mm 2 . The leaves of Q. glauca are hypostomatous (Deng et al, 2014); thus, stomatal and epidermal cell counts were made on the abaxial surface. The software package ImageJ version 1.42q was used for SD/SI counts.…”

Section: Cuticle Preparation and Sd/si Countsmentioning

confidence: 99%

Stomatal frequency of Quercus glauca from three material sources shows the same inverse response to atmospheric pCO2

Xing

et al. 2019

Annals of Botany

View full text Add to dashboard Cite

Background and AimsThe inverse correlation between atmospheric CO2 partial pressure (pCO2) and stomatal frequency in many plants has been widely used to estimate palaeo-CO2 levels. However, apparent discrepancies exist among the obtained estimates. This study attempts to find a potential proxy for palaeo-CO2 concentrations by analysing the stomatal frequency of Quercus glauca (section Cyclobalanopsis, Fagaceae), a dominant species in East Asian sub-tropical forests with abundant fossil relatives.MethodsStomatal frequencies of Q. glauca from three material sources were analysed: seedlings grown in four climatic chambers with elevated CO2 ranging from 400 to 1300 ppm; extant samples collected from 14 field sites at altitudes ranging from 142 to 1555 m; and 18 herbarium specimens collected between 1930 and 2011. Stomatal frequency–pCO2 correlations were determined using samples from these three sources.Key ResultsAn inverse correlation between stomatal frequency and pCO2 was found for Q. glauca through cross-validation of the three material sources. The combined calibration curves integrating data of extant altitudinal samples and historical herbarium specimens improved the reliability and accuracy of the curves. However, materials in the climatic chambers exhibited a weak response and relatively high stomatal frequency possibly due to insufficient treatment time.ConclusionsA new inverse stomatal frequency–pCO2 correlation for Q. glauca was determined using samples from three sources. These three material types show the same response, indicating that Q. glauca is sensitive to atmospheric pCO2 and is an ideal proxy for palaeo-CO2 levels. Quercus glauca is a nearest living relative (NLR) of section Cyclobalanopsis fossils, which are widely distributed in the strata of East Asia ranging from the Eocene to Pliocene, thereby providing excellent materials to reconstruct the atmospheric CO2 concentration history of the Cenozoic. Quercus glauca will add to the variety of proxies that can be widely used in addition to Ginkgo and Metasequoia.

show abstract

Leaf epidermal features ofQuercussubgenusCyclobalanopsis(Fagaceae) and their systematic significance

Cited by 38 publications

References 28 publications

An updated infrageneric classification of the oaks: review of previous taxonomic schemes and synthesis of evolutionary patterns

An updated infrageneric classification of the oaks: review of previous taxonomic schemes and synthesis of evolutionary patterns

The Application and Limitation of Universal Chloroplast Markers in Discriminating East Asian Evergreen Oaks

Stomatal frequency of Quercus glauca from three material sources shows the same inverse response to atmospheric pCO2

Contact Info

Product

Resources

About