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Structural considerations and differences between leaf canals and secretory cavities in Asteraceae.

Daniel M Martínez-Quezada¹, Alicia Rojas-Leal², José Luis Villaseñor²

¹Área de Biología, Departamento de Preparatoria Agrícola, Universidad Autónoma Chapingo, Carretera México-Texcoco Km 38.8, 56230, Texcoco, Mexico State, Mexico.

|January 13, 2025

Summary

Secretory canals and cavities in Asteraceae plants develop similarly through schizogenous formation. These internal secretory structures in plants can be distinguished by their epithelial layers and origin from different meristematic tissues.

Keywords:

Bidens Tagetes Epithelial cells Lysigenous Schizogenous Secretory structures

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Area of Science:

Plant Anatomy
Plant Morphology
Botany

Background:

Secretory canals and cavities are internal secretory structures found in seed plants, particularly diverse in angiosperms.
Distinguishing between canals and cavities is challenging due to structural similarities.
These structures are known in families like Rutaceae, Myrtaceae, and Asteraceae.

Purpose of the Study:

To compare the ontogeny of secretory canals and cavities in two Asteraceae species.
To understand structural differences and establish homology hypotheses.
To differentiate canals and cavities in Asteraceae based on developmental and structural traits.

Main Methods:

Studied leaf development in Bidens odorata and Tagetes tenuifolia.
Utilized the methacrylate technique for sample processing.
Analyzed longitudinal and transverse sections.

Main Results:

Both canals and cavities in Asteraceae exhibit schizogenous development, unlike lysigenous development in Rutaceae.
Canals originate from procambium cells, while cavities arise from ground meristem cells.
Differentiation is possible based on secretory epithelium/sheath strata, epidermal/mesophyll modifications, and promeristem origin.

Conclusions:

Secretory canals and cavities in Asteraceae share a close evolutionary origin due to structural and developmental similarities.
Extravascular canals likely give rise to cavities in Asteraceae leaves.
These findings aid in distinguishing and understanding the evolution of secretory structures in plants.