TÍLIDES EN LA MADERA DE Gliricidia sepium (Jacq.) Steud.
Keywords:
Sapwood, heartwood, Gliricidia sepium, tropical dry forest, tyloses, VeracruzAbstract
The formation of tyloses in the secondary xylem of Gliricidia sepium, from a tropical dry forest in Veracruz, was studied in this project. Samples of 1 to 1.5 cm in diameter from the sapwood and heartwood of the stem and branches were obtained. Wood material was collected during the dry and wet seasons, and the presence of tyloses was determined in vessels using a double staining technique (fucsina-fast green), and the presence of tyloses in the vessels was quantified. In addition, wood samples with cambium of 1 cm in diameter taken during the dry season, were cultivated using media with and without auxins. Vessels from this season without tyloses wEre stained only with basic fucsina. Results show that the tyldose generatior, mecanisms might be related rather to the hydraulic loss, than to aging or heartwood formation. The presence of tyloses in very young vessels near the cambium, and a 1 O percent increase of tyloses during the dry season, suggest a low resistance to cavitation in the wood of this species. Moreover, the absence of tyloses in vessels of cambial specimens cultivated in auxin media, indicates that the growth hormon has little effect on tylose development.
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