Resumo

CABEZA CEPEDA, Henry Ananías; BALAGUERA-LOPEZ, Helber Enrique  e  USECHE DE VEGA, Dalia Soraya. Allelopathy from Campomanesia lineatifolia seed extract on Taraxacum officinale. Cienc. Tecnol. Agropecuaria [online]. 2021, vol.22, n.3, e2010.  Epub 31-Ago-2021. ISSN 0122-8706.  https://doi.org/10.21930/rcta.vol22_num3_art:2010.

Due to the indiscriminate use of some chemical synthesis herbicides and their high residuality in the soil, it is being implementing alternatives for the management of weeds, including allelopathy, which seeks to control weeds by natural compounds derived from plants. In this study, the effect of seeds extract of Campomanesia lineatifolia on Taraxacum officinale was evaluated; A completely randomized design was used in phase I (on seeds), and phase II (on plants), applying four extract concentrations (0, 3, 6 and 9 %). In phase I with germination the following were determined: percentage, mean speed and mean germination time. In phase II the incidence and severity of damage produced by the extract, effect in the chlorophyll fluorescence, the maximum efficiency of photosystem II, the rate of electron transport, photochemical quenching and non-photochemical quenching were determined. In phase I, concentrations of 3, 6 and 9 % completely inhibited germination. In phase II for these same treatments the incidence was 100 %, the highest severity (65.5 %) occurred with the extract of 9 %; in turn, the chlorophyll fluorescence showed significant reductions in the values of the determined variables, but in this phase, there was no plant death or tissue necrosis. Allelopathic effect of C. lineatifolia seed extract was found on germination and physiology of T. officinale.

Palavras-chave : bioherbicide; fluorescence of chlorophyll; germination; perennial weed; physiology; plant injury; plant physiology; seed extracts.

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