Articles
THE STOMATAL COMPLEX AND EPICUTICULAR CHARACTERISTICS OF CROWN ROT DISEASE OF AGAVE TEQUILANA WEBER (AGAVACEAE)
Article number
618_51
Pages
427 – 433
Language
English
Abstract
Agave tequilana Weber is a very important crop for Mexico and economy, because of tequila production.
This industry suffered due to the onset of A. tequilana diseases.
Studying the characteristics of this Agave impacting foliar uptake of agrochemicals is important.
In this research, our main purpose was to analize the foliar morphology of the Agave epidermis with particular interest in epicuticular characteristics and organization of the stomatal complex in healthy and diseased plants from young and adult individuals.
Plants from Tequila, Jalisco, México were sampled and prepared for LM, TEM and SEM studies.
Observations were made for cuticle thickness, wax on stomatal cavity, presence of crystals and morphology of the stomatal complex.
We found that young and adult diseased plants, had in general thicker cuticles.
In healthy plants, the amount of wax within the supraestomatal cavity was similar for both leaf surfaces, with higher amount within adult plants.
Diseased plants, either young or adult, had larger amount of wax on the lower leaf surface.
Calcium oxalate calcium were observed in higher concentrations on leaf surface of diseased plants.
The stomatal complex is tetracytic, with four subsidiary cells on the leaf surface.
These cells project into the leaf tissue, forming a cavity or suprastomatal chamber.
At the bottom of the cavity are the guard cells.
The morphological changes observed in the cuticle thickness, was content may represent an indicator of stress imposed by the disease.
This industry suffered due to the onset of A. tequilana diseases.
Studying the characteristics of this Agave impacting foliar uptake of agrochemicals is important.
In this research, our main purpose was to analize the foliar morphology of the Agave epidermis with particular interest in epicuticular characteristics and organization of the stomatal complex in healthy and diseased plants from young and adult individuals.
Plants from Tequila, Jalisco, México were sampled and prepared for LM, TEM and SEM studies.
Observations were made for cuticle thickness, wax on stomatal cavity, presence of crystals and morphology of the stomatal complex.
We found that young and adult diseased plants, had in general thicker cuticles.
In healthy plants, the amount of wax within the supraestomatal cavity was similar for both leaf surfaces, with higher amount within adult plants.
Diseased plants, either young or adult, had larger amount of wax on the lower leaf surface.
Calcium oxalate calcium were observed in higher concentrations on leaf surface of diseased plants.
The stomatal complex is tetracytic, with four subsidiary cells on the leaf surface.
These cells project into the leaf tissue, forming a cavity or suprastomatal chamber.
At the bottom of the cavity are the guard cells.
The morphological changes observed in the cuticle thickness, was content may represent an indicator of stress imposed by the disease.
Authors
R.E.M. Hernandéz-Valencia, R. López-Franco, J. Ruíz-Ordoñez, H. Ramirez-Rodriguez, A. Benavides-Mendoza
Keywords
cuticle, wax, guard cells, calcium oxalate crystals, stomatal morphology
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