Revision of the Mexican and Guatemalan Species of<i>Platanus</i>(Platanaceae)

Nixon, Kevin C.; Poole, Jackie M.

doi:10.25224/1097-993x-6.1.4

Cited by 47 publications

(43 citation statements)

References 19 publications

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“…The 10 living species of Platanaceae show relatively little morphological variation when compared to the extensive and diverse fossil record for the family (Crane 1989;Magalló nPuebla et al 1997;Maslova 2003Maslova , 2010Nixon and Poole 2003;Friis et al 2011;Denk et al 2012). Living representatives are generally united by palinactinodromous leaves, globose, unisexual inflorescences that are typically borne on a peduncle, and mature achenes with a persistent style (Nixon and Poole 2003).…”

Section: Introductionmentioning

confidence: 94%

“…Specifically of interest for this work are numerous specimens from the Cretaceous and Tertiary that suggest the presence of bisexual flowers and inflorescences (Friis 1985;Magalló n-Puebla et al 1997;Mindell et al 2006). Living Platanaceae have predominantly unisexual inflorescences and flowers (Nixon and Poole 2003), although rare bisexual inflorescences and flowers are observed (Boothroyd 1930;Schwarzwalder and Dilcher 1981;Floyd et al 1999). Thus, it is expected that the stratigraphic record would preserve bisexual flowers and inflorescences (Mindell et al 2006).…”

Section: Introductionmentioning

confidence: 95%

“…Living representatives are generally united by palinactinodromous leaves, globose, unisexual inflorescences that are typically borne on a peduncle, and mature achenes with a persistent style (Nixon and Poole 2003). This anomalous suite of characters has lent itself to various interpretations as to the systematic placement of the family (Griggs 1909;Schwarzwalder and Dilcher 1991;Hoot et al 1999;Hilu et al 2003).…”

Section: Introductionmentioning

confidence: 97%

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Bisexual Flowers from the Coniacian (Late Cretaceous) of Vancouver Island, Canada:Ambiplatanus washingtonensisgen. et sp. nov. (Platanaceae)

Mindell

Karafit

Stockey

2014

International Journal of Plant Sciences

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Methodology. Specimens occur in calcium carbonate concretions near the base of the Nanaimo Group (Comox Formation) and are studied with the cellulose acetate peel technique and SEM.Pivotal results. Inflorescences are small (!5 mm), pedunculate heads, with fewer than 30 flowers per inflorescence. Both bisexual and unisexual flowers are present on the same inflorescence. Elongate and overarching tepals enclose the developing gynoecium and androecium at early stages of development. More mature specimens have individual flowers with at least two whorls of tepals fused toward the base. Flowers have a whorl of five free stamens, each with short filaments and a sclerotic apical connective extension. In situ pollen is small, prolate, tricolpate, 11-13 mm in polar diameter, and 8-9 mm in equatorial diameter. In flowers where it can be observed, the staminal whorl encloses five short, conduplicate, glabrous carpels lacking differentiated styles but bearing broad, flat apices. The ovary of these carpels is occupied by a single ovule.Conclusions. While the Eden Main specimens display a five-parted gynoecial arrangement common in the pistillate flowers of other Cretaceous platanoids, Ambiplatanus washingtonensis gen. et sp. nov. provides the first fossil evidence of functional bisexuality in fossil Platanaceae.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 97%

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Bisexual Flowers from the Coniacian (Late Cretaceous) of Vancouver Island, Canada:Ambiplatanus washingtonensisgen. et sp. nov. (Platanaceae)

Mindell

Karafit

Stockey

2014

International Journal of Plant Sciences

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“…Castaneophyllum, with P. kerrii as the sole representative, and subg. Platanus (Nixon and Poole 2003). Clustering within subg.…”

Section: Rdna Its Region Sequencingmentioning

confidence: 99%

“…Platanus 9 hispanica Mill. ex Muenchh, Platanus hybrida Brot) is a tree species belonging to the Platanaceae, which is considered one of the earliest branches of the Eudicots (Nixon and Poole 2003). Fossil records indicate that Platanaceae have been an element of the northern hemisphere since the mid-Cretaceous period.…”

Section: Introductionmentioning

confidence: 99%

Platanus × acerifolia genotypes surviving to inoculation with Ceratocystis platani (the agent of canker stain): first screening and molecular characterization

et al. 2009

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Canker stain, caused by the fungus Ceratocystis platani, is a destructive disease in Platanus spp. It has been recently proved that resistant accessions can be produced and grown in Europe. However, additional resistant genotypes are still needed in order to avoid the onset of virulent pathogen strains favoured by the selection pressures exerted by genetically homogeneous resistant plane tree plantings. In this study we present the results of two parallel experiments performed on 975 accessions of P. 9 acerifolia seedlings and P. 9 acerifolia clones derived by cutting propagation from mature trees grown in the urban environments. The selection process was based on inoculation with C. platani and yielded 13 accessions that showed different types of resistant reactions and survived in a stable manner thoughout the period of observation. Selected accessions were characterised by sequencing the rDNA-ITS region and by developing PCR procedures capable of detecting P. orientalis and P. occidentalis LEAFY homoeologues. These molecular analyses enabled us to confirm the identification of the species, its hybrid origin and to assess an evident genetic variability among the accessions, which therefore have to be considered as different genotypes.

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Quantifying the effect of shade on cuticle morphology and carbon isotopes of sycamores: present and past

Milligan

Flynn

Wagner

et al. 2021

American J of Botany

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Premise Reconstructing the light environment and architecture of the plant canopy from the fossil record requires the use of proxies, such as those derived from cell wall undulation, cell size, and carbon isotopes. All approaches assume that plant taxa will respond predictably to changes in light environments. However, most species‐level studies looking at cell wall undulation only consider “sun” or “shade” leaves; therefore, we need a fully quantitative taxon‐specific method. Methods We quantified the response of cell wall undulation, cell size, and carbon isotopes of Platanus occidentalis using two experimental setups: (1) two growth chambers at low and high light and (2) a series of outdoor growth experiments using green and black shade cloth at different densities. We then developed and applied a proxy for daily light integral (DLI) to fossil Platanites leaves from two early Paleocene floras from the San Juan Basin in New Mexico. Results All traits responded to light environment. Cell wall undulation was the most useful trait for reconstructing DLI in the geological record. Median reconstructed DLI from early Paleocene leaves was ~44 mol m−2 d−1, with values from 28 to 54 mol m−2 d−1. Conclusions Cell wall undulation of P. occidentalis is a robust, quantifiable measurement of light environment that can be used to reconstruct the paleo‐light environment from fossil leaves. The distribution of high DLI values from fossil leaves may provide information on canopy architecture; indicating that either (1) most of the canopy mass is within the upper portion of the crown or (2) leaves exposed to more sunlight are preferentially preserved.

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Revision of the Mexican and Guatemalan Species ofPlatanus(Platanaceae)

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 47 publications

References 19 publications

Bisexual Flowers from the Coniacian (Late Cretaceous) of Vancouver Island, Canada:Ambiplatanus washingtonensisgen. et sp. nov. (Platanaceae)

Bisexual Flowers from the Coniacian (Late Cretaceous) of Vancouver Island, Canada:Ambiplatanus washingtonensisgen. et sp. nov. (Platanaceae)

Platanus × acerifolia genotypes surviving to inoculation with Ceratocystis platani (the agent of canker stain): first screening and molecular characterization

Quantifying the effect of shade on cuticle morphology and carbon isotopes of sycamores: present and past

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