Resumen

JIMENEZ-NORIEGA, Mayte Stefany et al. Moisture content and rehydration in rose flower stems exposed to the environment. Rev. Mex. Cienc. Agríc [online]. 2022, vol.13, n.7, pp.1159-1170.  Epub 22-Nov-2022. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v13i7.3083.

At least in one phase of postharvest, the flower stems of rose are exposed to the environment. The water they lose and the rehydration in the vase will depend on the temperature and anatomy of the flower stem. In this research, the moisture content of two cultivars of Rosa hybrida exposed to room temperature from 0 to 48 h was evaluated and the anatomy of the leaf and stem was described. In March 2019, flower stems of ‘Engagement’ and ‘Freedom’ roses were harvested, in a commercial greenhouse in Puebla, Mexico and transported dry to the laboratory of the Iztacala Faculty of Higher Studies, where they were spread out on a table. Evaluations were conducted every 8 h. In both cultivars, the initial moisture of stems and leaves was 75%. In those that were exposed for 24 hours, it was 66 and 57% for ‘Engagement’ and ‘Freedom’, respectively. The thickness of the cuticle and mesophyll was 96 and 26% greater in ‘Engagement’ than in ‘Freedom’ (180.9 and 2.4 μm). The stems of ‘Engagement’ had 331 vessels per mm2 with 29.5 μm in diameter, those of ‘Freedom’ 402 of 26.5 μm. The ‘Engagement’ rose lost less water than ‘Freedom’ due to the greater thickness of its cuticle and amplitude of its mesophyll. The number of vessels had little effect on water loss or rehydration in the vase. In both cultivars, the flower stems could have a useful vase life even if they are exposed to the environment for 8 or 16 h without any protection, with longer times it decreases due to dehydration of the leaves.

Palabras llave : Rosa hybrida L.; cuticle thickness; number of vessels; vase life..

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