Abstract
ABSTRACT The use of growth-promoting bacteria can increase the yield and quality of seeds of several annual crops, such as soybean. Based on that, the present study aimed to evaluate the effects of the inoculation of Bacillus subtilis strains on seed treatment, evaluating the yield and quality of seeds of two soybean cultivars. The experiment was conducted in a conventional system, in an Oxisol of clayey texture, in a crop under sprinkler irrigation. The experimental design was randomized blocks, arranged in split plots with four repetitions. Treatments were composed, in the plots, of two soybean cultivars: M7110 IPRO and Brasmax Desafio RR. Within the levels of subplots, the treatments consisted of inoculation and doses of inoculant: Bacillus subtilis Pant001 strain at doses of 0, 2, 3, 4 and 5 mL kg-1, and QST713 strain at the recommended dose of 2 mL kg-1. Inoculation with the strains Pant001 and QST713 increased the yield of both soybean cultivars tested, besides improving seed quality due to the increase in the concentration of total storage proteins, seedling emergence percentage and seed vigor by the accelerated aging test.
Highlights
Soybean (Glycine max (L.) Merrill) occupied 35,866 million hectares in the 2018/2019 season, with average grain yield of 3,207 kg ha-1 (CONAB, 2019)
Considering the limitations of biological N fixation (BNF) in the soybean crop and the benefits observed in several crops with the inoculation of Bacillus subtilis, especially in the biological control of plants, production of natural antibiotics and protective effect against secondary soil phytopathogens (Araújo & Marchesi, 2009; Kuhn & Pascholati, 2010; Pavan et al, 2011; Jardin, 2015), in addition to growth and development of the root system, greater absorption of water and nutrients, it is inferred that the coinoculation with Bradyrhizobium and B. subtilis may favor the development of the crop and, the production and quality of its seeds (Hungria et al, 2013; Bishnoi et al, 2015; Singh et al, 2016; Tahir et al, 2017; Galindo et al, 2018)
In view of the above, this study aimed to evaluate the effects of seed inoculation with Bacillus subtilis strains on two soybean cultivars (M7110 IPRO and Brasmax Desafio RR), by assessing the yield and quality of the seeds produced
Summary
Soybean (Glycine max (L.) Merrill) occupied 35,866 million hectares in the 2018/2019 season, with average grain yield of 3,207 kg ha-1 (CONAB, 2019). Considering the limitations of biological N fixation (BNF) in the soybean crop and the benefits observed in several crops with the inoculation of Bacillus subtilis (soil free-living diazotroph), especially in the biological control of plants, production of natural antibiotics and protective effect against secondary soil phytopathogens (Araújo & Marchesi, 2009; Kuhn & Pascholati, 2010; Pavan et al, 2011; Jardin, 2015), in addition to growth and development of the root system, greater absorption of water and nutrients, it is inferred that the coinoculation with Bradyrhizobium and B. subtilis may favor the development of the crop and, the production and quality of its seeds (Hungria et al, 2013; Bishnoi et al, 2015; Singh et al, 2016; Tahir et al, 2017; Galindo et al, 2018) In this context, given the lack of information on the effects of co-inoculation with Bradyrhizobium and B. subtilis under Brazilian Cerrado conditions on soybean seed quality and yield, this study has as the hypothesis that the co-inoculation of soybean seeds may favor the initial development, making this crop more vigorous and, increase the protein concentrations in its grains. In view of the above, this study aimed to evaluate the effects of seed inoculation with Bacillus subtilis strains on two soybean cultivars (M7110 IPRO and Brasmax Desafio RR), by assessing the yield and quality of the seeds produced
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