Resumo

CAMPA-PEREZ, Mary Cruz et al. Allelopathic activity of alfalfa root exudates in Arabidopsis thaliana. Rev. Mex. Cienc. Agríc [online]. 2023, vol.14, n.5, pp.66-77.  Epub 15-Set-2023. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v14i5.3090.

Alfalfa (Medicago sativa) is native to Central Asia, this legume is sown throughout Mexico, contributes to the regeneration of soil fertility, in addition, its high content of proteins and amino acids helps reduce costs of meat and milk production. The objective of this study was to evaluate different sowing densities and the effectiveness of the extract based on alfalfa exudates on seedlings of Arabidopsis thaliana (L.) Heynh. Seeds of the alfalfa varieties San Miguelito and Belleza Verde were used. Sowing was established in Petri dishes at the National Technological Institute of Mexico, Roque campus in November 2018. Three sowing densities, 3, 6 and 9 kg ha-1, were used. All variables were subjected to an analysis of variance and a comparison of means, with the SAS 9.0 package. The sowing density affected the root development of alfalfa, in particular the development of lateral roots and the presence of root hairs, but not the root length. The sowing density with the highest root development was with 9 kg ha-1. The exudates of alfalfa presented a very marked antagonistic effect on Arabidopsis thaliana by reducing its growth, this effect was higher for the density of 9 kg ha-1. A concentration of 50% or more of alfalfa exudates slows the growth until death of this Arabidopsis thaliana.

Palavras-chave : Arabidopsis thaliana; allelopathy; forage.

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