Evolutionary developmental studies in fossil stems of Corystospermaceae

Bodnar, Josefina

doi:10.22179/revmacn.14.373

Cited by 6 publications

(1 citation statement)

References 95 publications

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“…In fossil seed plants, all three categories of vascular variants can be recognized. ‘Medullary vascular systems’ (Corystopermales: Bodnar 2012 ) likely include cases of procambial variants, as in the atypical medullosan eustele ( Dunn et al 2003 ). Stems with differential cambial activity that generate ‘axial vascular elements in segments’ (Corystopermales: Bodnar and Coturel 2012 ) represent one type of cambial variant, while successive cambia (e.g.…”

Section: Vascular Variants Beyond Seed Plantsmentioning

confidence: 99%

Vascular variants in seed plants—a developmental perspective

Neto

2023

AoB PLANTS

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Over centuries of plant morphological research, biologists have enthusiastically explored how distinct vascular arrangements have diversified. These investigations have focused on the evolution of steles and secondary growth and examined the diversity of vascular tissues (xylem and phloem), including atypical developmental pathways generated through modifications to the typical development of ancestral ontogenies. A shared vernacular has evolved for communicating on the diversity of alternative ontogenies in seed plants. Botanists have traditionally used the term “anomalous secondary growth” which was later renamed to “cambial variants” by late Dr. Sherwin Carlquist (1988). However, the term “cambial variants” can be vague in meaning since it is applied for developmental pathways that do not necessarily originate from cambial activity. Here, we review the “cambial variants” concept and propose the term “vascular variants” as a more inclusive overarching framework to interpret alternative vascular ontogenies in plants. In this framework, vascular variants are defined by their developmental origin (instead of anatomical patterns), allowing the classification of alternative vascular ontogenies into three categories: (1) procambial variants, (2) cambial variants and (3) ectopic cambia. Each category includes several anatomical patterns. Vascular variants, which represent broader developmental-based groups, can be applied to both extant and fossil plants, and thereby offer a more adequate term from an evolutionary perspective. An overview of the developmental diversity and phylogenetic distribution of vascular variants across selected seed plants is provided. Finally, the evolutionary implications of vascular variants are discussed.

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Section: Vascular Variants Beyond Seed Plantsmentioning

confidence: 99%

Vascular variants in seed plants—a developmental perspective

Neto

2023

AoB PLANTS

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Petrified Woods in the Mesozoic of Southern Brazil

Dutra

Crisafulli

2022

Brazilian Paleofloras

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Araucariaceous fossil woods from the Upper Triassic Ischigualasto Formation (San Juan Province, Argentina): paleofloristic and paleoclimatic implications

et al. 2022

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In this contribution, fossil woods from the Valle de La Luna Member of the Upper Triassic Ischigualasto Formation at Ischigualasto Provincial Park, San Juan Province, Argentina, are described. The specimens are preserved as silica permineralization in tuffs intercalated with carbonaceous mudstone beds interpreted as distal floodplain facies. The fossil woods were assigned to the new species Agathoxylon argentinum since their anatomy differs from the known Mesozoic Gondwanan species of the genus Agathoxylon. The combination of characters present in the new taxon indicates an affiliation with the conifer family Araucariaceae. Signals of fungal-mediated wood decay were observed, comparable to the activity of basidiomycetes. Spherical structures attached to the walls of the tracheids were recognized and are interpreted as holocarpic chytrid fungi. The growth rings were quantitatively analyzed. Low values of percentage diminution, percentage latewood, and Ring Markedness Index, and a mean percentage skew of +11.5, were obtained, suggesting that the new species was an evergreen gymnosperm. The stratigraphic distribution and taxonomic composition of the Ischigualasto Formation fossil-plant-bearing levels were studied. A vegetation change is recorded in the fossil level bearing Agathoxylon argentinum n. sp., marked by the replacement of the corystosperm genera and a diminution of arboreal corystosperms. This floristic change, in addition to other evidence, indicates humid paleoclimatic conditions for the uppermost part of the Valle de La Luna Member of the Ischigualasto Formation.

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Evolutionary developmental studies in fossil stems of Corystospermaceae

Cited by 6 publications

References 95 publications

Vascular variants in seed plants—a developmental perspective

Vascular variants in seed plants—a developmental perspective

Petrified Woods in the Mesozoic of Southern Brazil

Araucariaceous fossil woods from the Upper Triassic Ischigualasto Formation (San Juan Province, Argentina): paleofloristic and paleoclimatic implications

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