Resumo

DE-LA-CRUZ-GUZMAN, G. H. et al. Stem anatomy of alstroemeria cv. Rebeca and its relation whit the life in vase. Revista bio ciencias [online]. 2019, vol.6, e568.  Epub 02-Out-2020. ISSN 2007-3380.  https://doi.org/10.15741/revbio.06.e568.

A descriptive and quantitative analysis across the caulinar axis of alstroemeria cv. Rebecca was performed to identify a potential correlation between the water absorption rate and its vase life. To this aim, four treatments, each one containing three floral stems, were established. For anatomic analysis, stems were trimmed at 2, 20, 40 and 60 cm from the inflorescence. To evaluate the vase life, 20 floral stems were harvested and trimmed according to treatments, weighted, and subsequently transferred into vases (one floral stem per vase) containing 250 mL of Chrystal clear® solution. Vases containing floral stems were randomly distributed and kept under the following environmental conditions: Light of 10 µmoles m-2 s-1, 20 0C and 45 % relative humidity. The alstroemeria vascular cylinder is classified as atactostele, which was characterized by the presence of bigger vascular bundles located at the center of the cylinder and surrounded by smaller bundles. Floral stems trimmed at 2 cm showed more vessel elements and vascular bundles per mm2 and by cross section. Floral stems trimmed at 20, 40 or 60 cm showed vessel elements with bigger area and diameter. The risk of cavitation occurrence is lower in zones close to the inflorescence, which promotes the water absorption rate leading to an increase in the fresh weight and in vase life. In contrast, in zones farther away from the inflorescence, vessel elements are more prone to experiment cavitation, which is why both water absorption rate and vase life are reduced.

Palavras-chave : Alstroemeria aurea Graham; vascular bundles; xylem area; vessel elements; absorption rate; floral button opening.