Resumo

NELSON-OSVALDO, VALERO-VALERO; KENIA-ADOLFINA, CHIMA-MARTÍNEZ  e  JAVIER-ALEXANDER, GÓMEZ-GÓMEZ. Biostimulant effect of a synthetic chalcone on guajiro beans(Vigna unguiculata L. Walp). Rev.Bio.Agro [online]. 2023, vol.21, n.2, pp.62-74.  Epub 01-Dez-2023. ISSN 1692-3561.  https://doi.org/10.18684/rbsaa.v21.n2.2023.2153.

Guajiro bean is an important subsistence crop in dry lands of the Colombian Caribbean, where environmental stresses often enhance plant stress and limit crop production. Plant biostimulants improve plant performance under stress conditions; chalcones have not been studied as biostimulants but they are multifunctional molecules that express bioactivity and are involved in the regulation of plant metabolism; therefore, it is convenient to study their properties as biostimulants in agriculture. The aim of this work was to evaluate the effect of the synthetic chalcone 3-(4-nitrophenyl)-1-(pyridin-2-i)-prop-2-en-1-one (CHSNPP) on the early growth of guajiro bean (Vigna unguiculata), under plant growth chamber conditions, to provide evidence for a possible application as a biostimulant. CHSNPP solutions were tested at concentrations of 25, 50, 100 and 150 ppm, and two forms of application were evaluated (foliar spray - AF and immersion - IM of seedlings in the solution). The IM treatment with 25 ppm caused an increase of 321 % in the surface area of roots, with 50 ppm there was an increase of 78 % in the number of nodules formed by symbiosis with native rhizobia present in the soil, in addition to increases of 111 % in biomass and 16 % in the chlorophyll content index -ICC, finally with 150 ppm the number of roots increased up to 82 %; the PA treatment with 150 ppm resulted in increases in leaf area and biomass of 101 % and 137 %. It is concluded that the responses observed in plants treated with CHSNPP are characteristic of the mechanisms of action of some non-microbial biostimulants, which suggests a possible use as a biostimulant in guajiro beans.

Palavras-chave : Biostimulation; Nodules; Rhizobia; Chalcones; Symbiosis; Plant growth promotion; Legumes; Plant stress.

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