Abstract

RUIZ-SANCHEZ, Esaú et al. Effect of pre-germinate treatments and microbial inoculation in peanut (Arachis hypogaea L.). Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.6, pp.1177-1187. ISSN 2007-0934.

Peanut crop (Arachis hypogaea L.) is widely used by farmers for their profitability and improvement of the physical and chemical soil traits has a prolonged seed dormancy, which runs up to six months. In other plant species, seed dormancy has been treated with inducers of germination, such as gibberellic acid (AG₃), indoleacetic acid and Naproxen (NPX). Another technical issue in the peanut crop is the slow growth ofthe early stages ofthe plants. This would increase with the use of bacterial strains to growth promoters. The aim of this study was to evaluate the effect of AG₃ and NPX as inducers of germination, and strains of Bacillus spp. as promoting plant growth. Germination and two times two concentrations immersion in AG₃ and NPX were used, while three strains of Bacillus spp were used as inoculants to enhance growth (CBTC1, CBCC57 and CBRF12). Germination increased with the treatment of 10 mg mL^-1 of AG₃; meanwhile, the relative growth rate in height of the plants was significantly increased at 15 days after sowing, when inoculated with the strain of Bacillus spp CBRF12. We also found a significantly larger increase in root dry biomass at 30 days after planting, with the CBTC1 strain. In conclusion, the percentage of germination of A. hypogaeae increased with the addition of AG₃. Also, the growth of the plant increased, albeit slightly, and other significantly only in some variables, by inoculating the strains of Bacillus spp. The results of this study show AG₃ capacity to break seed dormancy on peanuts; as well as the advantages of using growth promoting bacteria in the increase of height and root biomass of this plant species. This could be helpful in peanut production by reducing latency and accelerate growth.

Keywords : Bacillus spp; gibberellic acid; latency; naproxen; plant growth.

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