|Authors: ||A.C.B.P. Pessoa, A.C.R. de Castro, D.J.L. Sousa , M.I. Gall„o|
|Keywords: ||calcium oxalate crystals, cuticle, starch, stomata, phenolic compounds|
Anthurium affine Schott and Anthurium raimundii Mayo, Haigh & Nadruz are two native species of northeast Brazil and have high potential for use as ornamental plants.
They belonging to the Araceae family and can survive in stressful environmental conditions.
The aim of this work was to describe the anatomy of these plants and possible correlation to environmental aspects which may be important factors in the leaf durability.
Fully expanded leaves of plants selected from the Embrapa Germplasm Bank of Ornamental Tropical Plants located in Fortaleza-CE were fixed in FAA, dehydrated in ethanol, subjected to pre-infiltration solution, infiltration solution and inserted in Leica Historesin.
The material was cut into semi-automatic microtome with a thickness of 10 μm and the sections were stained with Toluidine Blue for structural analysis.
For histochemical analysis, free hand cuts were obtained from the fixed material.
Phloroglucinol acid was used for detection of lignin and phenolic compounds, Sudan III was used for detection of lipids, and for the detection of starch Lugol was used.
The leaves were subjected to sodium hypochlorite for analysis of the epidermis in paradermic order.
The two species had similar anatomical features.
Both have a uniseriate epidermis with paracytic stomata in abaxial face and are completely covered by a thick cuticle.
The mesophyll consists of chlorenchyma.
In A. affine and A. raimundii the vascular bundles are of the collateral type, completely surrounded by fibers, which are concentrated more strongly in front of the phloem.
The parenchyma of the midrib and petiole are rich in starch.
Many idioblasts were observed, containing phenolic compounds and calcium oxalate crystals.
The thick cuticle may prevent excessive water loss by evapotranspiration and the large amount of stored energy reserves can help the plant to survive periods of dryness, typical of northeastern Brazil.
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