Evolutionary developmental studies in fossil stems of Corystospermaceae

Bodnar, Josefina

doi:10.22179/revmacn.14.373

Cited by 7 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%