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Vascular variants in seed plants-a developmental perspective.

Israel L Cunha Neto¹

¹School of Integrative Plant Sciences and L.H. Bailey Hortorium, Cornell University, 237 Mann Dr, Ithaca, NY 14853, USA.

|July 21, 2023

Summary

Researchers propose "vascular variants" to better classify plant development, offering a new framework for studying plant evolution and diversity across species.

Keywords:

cambium development ectopic cambia evolution meristems plant anatomy procambium vascular tissue

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Area of Science:

Plant Morphology
Evolutionary Botany
Developmental Biology

Background:

Plant morphology research has long studied diverse vascular arrangements and secondary growth.
Traditional terms like 'anomalous secondary growth' and 'cambial variants' lack precision for atypical plant development.
Existing terminology can be vague, as 'cambial variants' is applied to pathways not originating from cambial activity.

Purpose of the Study:

To review the concept of 'cambial variants' in plant morphology.
To propose 'vascular variants' as a more inclusive framework for alternative vascular ontogenies.
To establish a new classification system based on developmental origin.

Main Methods:

Review of existing literature on plant vascular development.
Conceptual framework development for classifying vascular ontogenies.
Analysis of developmental origins (procambial, cambial, ectopic).

Main Results:

The term 'vascular variants' is proposed as an overarching framework.
A new classification system categorizes variants into procambial, cambial, and ectopic types.
This framework is applicable to both extant and fossil plants.

Conclusions:

'Vascular variants' provides a more adequate and inclusive term for studying alternative vascular ontogenies.
The proposed framework enhances understanding of plant evolution from a developmental perspective.
The classification aids in analyzing the diversity and phylogenetic distribution of vascular development in seed plants.