Effect of Aspergillus and Bacillus Concentration on Cotton Growth Promotion

Abstract

There are no studies in literature on the effect of inoculant concentrations on plant growth promotion. Therefore, in the present study, two experiments were carried out, one under pot conditions and the other in the field with cotton crop, in order to verify the effect of Aspergillus and Bacillus concentrations on the biometric and nutritional parameters of plant and soil, in addition to yield. The pot experiment evaluated the effect of different concentrations, ranging from 1 × 104 to 1 × 1010 colony-forming units per milliliter (CFU mL–1) of microorganisms Bacillus velezensis (Bv188), Bacillus subtilis (Bs248), B. subtilis (Bs290), Aspergillus brasiliensis (F111), Aspergillus sydowii (F112), and Aspergillus sp. versicolor section (F113) on parameters plant growth promotion and physicochemical and microbiological of characteristics soil. Results indicated that the different parameters analyzed are influenced by the isolate and microbial concentrations in a different way and allowed the selection of four microorganisms (Bs248, Bv188, F112, and F113) and two concentrations (1 × 104 and 1 × 1010 CFU mL–1), which were evaluated in the field to determine their effect on yield. The results show that, regardless of isolate, inoculant concentrations promoted the same fiber and seed cotton yield. These results suggest that lower inoculant concentrations may be able to increase cotton yield, eliminating the need to use concentrated inoculants with high production cost.

Inoculum Concentration and Mineral Fertilization: Effects on the Endophytic Microbiome of Soybean

“…These attributes have been used for the biological control of seed pathogens and to promote plant growth (Araujo et al, 2005), modulate the root architecture, and improve the absorption of water and nutrients from the soil (Bavaresco et al, 2020), and to enhance the physiological parameters triggering various defense responsive enzymes. Escobar Diaz et al (2021b) studied different inoculant concentrations in cotton crops and verified that the high inoculant concentrations of different isolates of B. subtilis and two isolates of Aspergillus sp. did not affect the number of colony-forming units (CFUs) or affect plant growth promotion.…”

Comparative Genomics of Three Aspergillus Strains Reveals Insights into Endophytic Lifestyle and Endophyte-Induced Plant Growth Promotion

“…For example, some Aspergillus species have been reported to be plant pathogens, such as A. nidulans (AN), A. ochraceoroseus (AO), and A. tubingensis (AT) [ 37 , 38 , 39 , 40 , 41 ]. Meanwhile, some Aspergillus species are beneficial to plants, such as A. sydowii (AS), A. versicolor (AV), and A. awamori (AA) [ 42 , 43 , 44 , 45 ]. Another strain, the engineered fungus A. puulaauensis (AP), which was extracted from marine organisms, has been shown to have significant in vitro skin-protective activity against induced oxidative stress [ 46 ].…”