Abstract

BELENO-CARRILLO, Jocelyn; GOMEZ-GOMEZ, Liliana  and  VALERO-VALERO, Nelson Osvaldo. Bacillus mycoides and humic acids as biostimulants of cowpea under salinity stress. rev.udcaactual.divulg.cient. [online]. 2022, vol.25, n.2, e1974.  Epub Dec 16, 2022. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v25.n2.2022.1974.

Biostimulants have great potential in agriculture enhancing plant growth as well as stimulating tolerance to different types of stress. In this study, the effect of two biostimulants, Bacillus mycoides immobilized in alginate beads and humic acids (HA), was evaluated in cowpea plants grown in saline soil, following treatments were evaluated: 1) HA solution applied through foliar spray, 2) suspension of immobilized B. mycoides in beads applied around in the rhizosphere and 3) HA solution + immobilized B. mycoides suspension. Plants without biostimulant application were considered as control treatment. Relative water content (RWC), chlorophyll content index (CCI), proline, and polyphenol content were determined as indicators of stress tolerance mechanisms expression. Treatment 3 generated an increase of 11.27 % in RWC, while with treatment 2 a significant increase of 48.33 % in CCI and 49.07 % in proline content was observed; these results suggest the stimulation of tolerance mechanisms against salt stress. Effects exhibited after the treatments with immobilized B. mycoides suggest that this way of application of the bacteria can contribute to improving the growth and adaption of cowpea plants subjected to salt stress and can be tested in other plants of agricultural interest over saline stress affection.

Keywords : Bacillus mycoides; Biostimulants; Humic acids; Salinity; stress.

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