Abstract

GABRIEL ORTEGA, Julio; BAQUE LOPEZ, Génesis Melissa; BURGOS LOPEZ, Gema  and  MENDOZA MARCILLO, Bolívar. Thermic stress response of three lettuce cultivars (Lactuca sativa L.) in mulched fields. An overview of the region's climate. J. Selva Andina Biosph. [online]. 2025, vol.13, n.2, pp.129-139.  Epub Nov 30, 2025. ISSN 2308-3867.  https://doi.org/10.36610/j.jsabs.20252291.

In order to evaluate the agro-morphological and productive response to thermal stress of 3 lettuce cultivars (Lactuca sativa L.) in mulched field, an experimental plot was implemented in the community of Puerto La Boca, Puerto Cayo, Ecuador. The study factor was the effect of heat stress on 3 cultivars of curly lettuce; were housed in an experimental design of completely randomized blocks with 3 treatments (T1 Patagonia, T2 Starfighter, T3 Batavia BG) and 4 replications, the effect of transplant time was blocked. Each experimental unit had 45 plants planted in 3 rows at 0.20 m between plants and 0.80 m between rows and 1.80 m between platforms. Variables such as: number of leaves, percentage of leaf area, leaf area index, head diameter, plant height, root size, weight of plant with root, weight of plant without root and flavor were evaluated. The results were; Starfighter was outstanding in the number of leaves, non-spicy flavor for consumption, while Batavia BG was notorious in the percentage of leaf area and leaf area index, root size and weight of plant with root; but its leaves were spicy. Patagonia stood out in the diameter of the head and height of the plant. It was possible to select the Starfighter cultivar as the one with the best behavior and leaf quality.

Keywords : Leaf quality; freshness; plant weight; leaf pungency; leaf flavor; root size.

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