Effect of Bacillus aryabhattai on the initial establishment of pre-sprouted seedlings of sugarcane varieties

Abstract

This study proposes to examine the potential use of Bacillus aryabhattai in pre-sprouted seedlings of sugarcane inoculated with the microorganism when subjected to different regimes of water supply after transplanting. The experiment was laid out in a randomized-block design with a complete 3 × 2 × 5 factorial arrangement, in five replicates. The factors were represented by pre-sprouted seedlings of three sugarcane varieties (IAC 911099, RB 855156 and CTC 20), two seedling types (inoculated and not inoculated with B. aryabhattai) and five frequencies of water supply, which provided the ability of return to 100% soil field capacity, at every 0, 10, 20, 30 and 40 days. Plant mortality, plant height, number of leaves, stalk diameter and number of tillers were evaluated throughout the experimental period. At the end of the study, the shoot dry matter (SDM) and root dry matter (RDM) contents of the plants were measured. The number of leaves on the plant was affected only in isolation, according to the cultivar, without effects of the other studied factors. There was a double interaction effect between the factors of variety and inoculation (V*I) for the variables of SDM, stalk diameter and height; and between frequency and inoculation (F*I) for stalk diameter. There was a triple interaction effect between variety, inoculation and frequency (V*I*F) for the RDM variable. Thus, the use of B. aryabhattai as an inoculant in pre-sprouted seedlings of sugarcane at the time of seedling formation can improve plant development after transplanting depending on the cultivar used, especially in IAC 911099 and RB 855156.

Bacillus aryabhattai Mitigates the Effects of Salt and Water Stress on the Agronomic Performance of Maize under an Agroecological System

“…The harmful effects of salinity on water and nutrient uptake resulted in a reduction in the stem diameter; however, these effects were mitigated when using B. aryabhattai. The presence of rhizobacteria may have mitigated the osmotic effects imposed by salt stress via biochemical changes in the plant or rhizosphere, increasing the physiology of the exposed plants and facilitating water uptake [27,44]. Inoculation with PGPBs during the early stages of maize crop under drought conditions significantly improved the stem diameter [45].…”

“…In this scenario, the use of plant-growth-promoting rhizobacteria (PGPR), especially from the Bacillus genus, stands out in plant development. Some of the known mechanisms by which PGPRs can improve plant development include beneficial effects on promoting plant emergence and growth [27], antagonistic activity against phytopathogenic fungi [28], improvement of soil structure (by bacterial exopolysaccharides), provision of N to plants through biological nitrogen fixation, solubilization and mineralization of nutrients, particularly phosphate, and improvement of resistance to non-biological stresses [29]. The strain of B. aryabhattai CMAA 1363 was able to provide drought tolerance in maize plants [24].…”

Influence of Azospirillum brasilense on micro-propagated sugarcane seedlings

“…maize, rice, wheat), to contribute to plant growth, nutrition, and increased productivity (Boyko et al, 2011;Pham et al, 2022). In sugarcane, several works assure a positive response of Azospirillum in vegetative contribution, in seedling production, ratoon-cane, and pre-sprouted seedlings (May et al, 2021;Santos et al, 2021) Although, there is still insufficient information about the response of micro-propagated sugarcane seedlings, especially during the acclimatization phase, with the inoculation of nitrogen-fixing bacteria like A. brasilense. Weather controls are necessary for this phase to ensure the microorganism colonization and the mutual interaction response.…”