Sun and shade leaves? Cuticle ultrastructure of Jurassic Komlopteris nordenskioeldii (Nathorst) Barbacka

Guignard, Gaëtan; Bóka, Károly; Barbacka, Mária

doi:10.1016/s0034-6667(00)00078-6

Cited by 36 publications

(30 citation statements)

References 27 publications

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“…), but some morphological characters can be observed in fossil material, including differences in leaf size (shorter/smaller leaves in sun), leaf shape (more/narrower lobes in sun), thickness (thicker in sun), stomatal numbers (more in sun), papillae (more in sun), trichomes (more in sun), etc. (Givnish 1988; Kürschner 1997; Wilf 1997; Barbacka and van Konijnenburg‐van Cittert 1998; Guignard et al. 2001; Terashima et al.…”

Section: Discussionmentioning

confidence: 99%

Bennettitalean leaf cuticle fragments (here Anomozamites and Pterophyllum) can be used interchangeably in stomatal frequency‐based palaeo‐CO₂ reconstructions

et al. 2011

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Bennettites are an abundant and frequently well-preserved component of many Mesozoic fossil floras, often playing an important ecological role in flood plain vegetation communities. During a recent study focusing on stomatal indices of Triassic-Jurassic fossil plants, it became evident that the leaf fragments of two bennettite genera Anomoza-mites Schimper (1870) emend. Harris (1969) and Pterophyl-lum Brongniart (1825) display a significant overlap of leaf shape as well as cuticular characters. Owing to the preference of recognition of single taxa (ideally species) for the stomatal method, we use a database of 70 leaf fragments of Anomoza-mites and Pterophyllum compressions from five isotapho-nomic Late Triassic sedimentary beds of Astartekløft in East Greenland to test whether leaf and cuticle fragments of the two genera can be separated using a range of quantitative and qualitative morphological and statistical analyses. None of the observed characters-including stomatal frequencies-could be applied to separate the fragments of the two genera into well-defined groups. Our results therefore indicate that fragmented material and dispersed cuticles cannot be utilized to distinguish between Anomozamites or Pterophyllum at the genus level, but that instead these cuticle fragments may be used interchangeably as stomatal proxies. Classification of fossil leaves into either of these genera is thus only possible given adequate preservation of macro-morphology and is not possible based solely on cuticle morphology. We suggest that this large inter-and intra-generic morphological variation in both leaf and cuticle traits within Anomozamites and Ptero-phyllum may be related to the bennettites' role as understory plants, experiencing a range of micro-environmental conditions , perhaps depending mainly on sun exposure. Based on the results obtained in this study, we conclude that Anomozamites and Pterophyllum cuticle fragments can be employed interchangeably in palaeo [CO 2 ] reconstructions based on the stomatal method, thus potentially annexing a plethora of bennettitalean fossil plant material as CO 2 proxies, including dispersed cuticles.

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Section: Discussionmentioning

confidence: 99%

Bennettitalean leaf cuticle fragments (here Anomozamites and Pterophyllum) can be used interchangeably in stomatal frequency‐based palaeo‐CO₂ reconstructions

et al. 2011

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“…The differences are as follows: in the leaf cuticles of two Czekanowskiales, Arctobaiera and Phoenicopsis, a cuticle proper A (¼A2) þ a cuticular layer B differentiated in two sublayers are recognized (¼B1 þ B2; Zhou and Guignard 1998). In the Pteridospermales, the genera Komlopteris (Guignard et al 2001) and Dichopteris (Théve-nard et al 2005) present only the granular layer A2, while the genus Pachypteris (Corystospermaceae, Umkomasiaceae; Guignard et al 2004) has an upper cuticle composed of A (¼A1 upper þ A1 lower þ A2) and B (¼B1) and a lower cuticle with A (¼A1 þ A2) and B (¼B1). In the Bennettitales, three other types occur: one type for the genera Otozamites, Zamites, and Dictyozamites (outer layer lamellate, inner layer alveolate, 0.90-1.70 mm in width); a second type for Ptilophyllum and Pterophyllum (outer layer alveolate or reticulate, inner layer lamellate-reticulate, 2.45-3.25 mm in width); and the third type for Cycadolepis and Williamsonia (outer layer reticulate, inner layer lamellate, 2.35-5.75 mm in width; Villar de Seoane 1999, 2003.…”

Section: Del Fueyo Et Al-leaf Cuticle Anatomy Of Ginkgoites Ticoensismentioning

confidence: 99%

Leaf Cuticle Anatomy and the Ultrastructure ofGinkgoites ticoensisArchang. from the Aptian of Patagonia

Fueyo

Guignard

Seoane

et al. 2013

International Journal of Plant Sciences

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The leaf cuticle of the Ginkgoites ticoensis Archang. type material from the Aptian Anfiteatro de Ticó Formation in Patagonia, Argentina, is fully characterized with additional scanning and transmission electron microscopic observations. Many new anatomical and ultrastructural cuticular features are identified in the four-lobed leaf of G. ticoensis: the leaf shows a hypostomatic and papillate laminae, straight and pitted anticlinal and granulate periclinal walls, actinocytic stomata with between five and seven papillate, striate subsidiary cells, and guard cells with anticlinal smooth walls. The TEM studies on ordinary epidermal cells, papillae, subsidiary cells, and guard cells reveal general ultrastructural features of Ginkgoaceae: an outer polylamellate layer A made with A1 and a granular inner layer A2; A1 with an upper part A1U with continuous and straight translucent lamellae; a lower part A1L with significantly disrupted and waving translucent lamellae; and the fibrillar cuticular layer B1 as the innermost part. Ten ultrastructural characters are detailed and ranked by the use of confidence intervals based on 30 statistical measurements. A threedimensional reconstruction of the cuticle is also provided. Because of the anatomical and ultrastructural fine details shown in the G. ticoensis cuticle, new elements are given to suggest its probable family affinity and to enhance the specificities of Ginkgo and Ginkgoites.

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“…The first taxonomical work was carried out by Nagy (1961), who identified and described about 30 species. Since 1990 Barbacka and colleagues (Barbacka 1991(Barbacka , 1993(Barbacka , 1994a(Barbacka , b, c, 1997Philippe and Barbacka 1997; Barbacka and van Konijnenburg-van Cittert 1998;Guignard et al 2001) have reviewed specimens stored in the collections of the Hungarian Natural History Museum and have studied new material from recent field campaigns, demonstrating the high diversity and variability of the macrofloral assemblages.…”

Section: Introductionmentioning

confidence: 99%

Palaeoenvironment of the Late Triassic (Rhaetian) and Early Jurassic (Hettangian) Mecsek Coal Formation (south Hungary): implications from macro- and microfloral assemblages

Götz

Ruckwied

Barbacka

2011

Palaeobio Palaeoenv

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The changes in early Mesozoic land plant communities, their vegetation patterns and vegetation dynamics are still only poorly understood, mainly because of the lack of integrated studies on fossil plant macroremains and palynomorphs. The Early Jurassic represents a major recovery phase of marine and terrestrial ecosystems after one of the biggest mass extinction events in Earth's history at the end of the Triassic period. The present study focuses on the southern Hungarian Mecsek Coal Formation of Late Triassic (Upper Rhaetian) to Early Jurassic (Hettangian) age, which has yielded unique plant fossils and diverse palynomorph assemblages which are used to study floral changes within a phase of ecological recovering. The Hungarian coal-bearing series of the Mecsek Mountains are seen to represent key sections for analysing regional changes in land plant communities and also to detect the influence of global climatic change. Furthermore, the cyclic sedimentation of the Mecsek Coal Formation enables a high time resolution of the processes, thus leading to a better understanding of the "beat" in floral changes.

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Sun and shade leaves? Cuticle ultrastructure of Jurassic Komlopteris nordenskioeldii (Nathorst) Barbacka

Cited by 36 publications

References 27 publications

Bennettitalean leaf cuticle fragments (here Anomozamites and Pterophyllum) can be used interchangeably in stomatal frequency‐based palaeo‐CO₂ reconstructions

Bennettitalean leaf cuticle fragments (here Anomozamites and Pterophyllum) can be used interchangeably in stomatal frequency‐based palaeo‐CO₂ reconstructions

Leaf Cuticle Anatomy and the Ultrastructure ofGinkgoites ticoensisArchang. from the Aptian of Patagonia

Palaeoenvironment of the Late Triassic (Rhaetian) and Early Jurassic (Hettangian) Mecsek Coal Formation (south Hungary): implications from macro- and microfloral assemblages

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Sun and shade leaves? Cuticle ultrastructure of Jurassic Komlopteris nordenskioeldii (Nathorst) Barbacka

Cited by 36 publications

References 27 publications

Bennettitalean leaf cuticle fragments (here Anomozamites and Pterophyllum) can be used interchangeably in stomatal frequency‐based palaeo‐CO2 reconstructions

Bennettitalean leaf cuticle fragments (here Anomozamites and Pterophyllum) can be used interchangeably in stomatal frequency‐based palaeo‐CO2 reconstructions

Leaf Cuticle Anatomy and the Ultrastructure ofGinkgoites ticoensisArchang. from the Aptian of Patagonia

Palaeoenvironment of the Late Triassic (Rhaetian) and Early Jurassic (Hettangian) Mecsek Coal Formation (south Hungary): implications from macro- and microfloral assemblages

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Product

Resources

About

Bennettitalean leaf cuticle fragments (here Anomozamites and Pterophyllum) can be used interchangeably in stomatal frequency‐based palaeo‐CO₂ reconstructions

Bennettitalean leaf cuticle fragments (here Anomozamites and Pterophyllum) can be used interchangeably in stomatal frequency‐based palaeo‐CO₂ reconstructions