Hormonal imbalance triggered by rhizobacteria enhance nutrient use efficiency and biomass in oil palm

Lima, Josué Valente; Tinôco, Ricardo Salles; Olivares, Fábio Lopes; Moraes, Alessandra Jackeline Guedes de; Chia, Gilson Sanchez; Silva, Gisele Barata da

doi:10.1016/j.scienta.2019.109161

Cited by 13 publications

(15 citation statements)

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“…For example, auxinic activity stimulates the germination of seeds and tubers; increases the rate of xylem and root development; controls vegetative growth processes; initiates lateral and adventitious root formation; mediates responses to light, gravity, and flowering; and affects photosynthesis, pigment formation, the biosynthesis of various metabolites, and the resistance to stressful conditions [ 72 ]. In addition, several PGPB regulate the auxin balance and thus change the root growth rates and architecture [ 69 , 72 , 73 , 74 ].…”

Section: Stress Tolerance Mechanisms Mediated By Plant Growth-promoti...mentioning

confidence: 99%

“…Changes in root anatomy and biochemistry mediated by phytohormonal modulation are one of the well-recognizable microbial inoculant’s actions on crop agroecosystems [ 51 , 53 , 55 , 69 , 73 ]. Interestingly, such plant-growth promotion effects are pivotal in increasing water availability under environmental scarcity when the soil matrix water potential is low.…”

Section: Stress Tolerance Mechanisms Mediated By Plant Growth-promoti...mentioning

confidence: 99%

“…Microbial inoculants designed as agricultural bioinputs are formulations composed of live microorganisms (fungi, bacteria, and algae) and/or their metabolites with biofertilizer, biostimulation, and bioprotection properties applied to agroecosystems as sustainable approaches [ 12 , 73 , 113 ]. Bioinoculants can be applied to soil, seeds, or plant surfaces (delivering niches) in distinct physicochemical formulations (microbial composition, carriers, and additives) and with proper time application that considers the physiological status of the crop (ontogeny-time delivery).…”

Section: Microbial Inoculants To Mitigate Drought Stress In Agroecosy...mentioning

confidence: 99%

“…In turn, these microorganisms can colonize the rhizosphere, surfaces, or interior of plants and promote plant growth by (a) increasing the nutrient availability in the plant-soil system (i.e., biological nitrogen fixation, mineral solubilization, and organic compounds mineralization) and (b) enhancing nutrient absorption by hormonal action (auxin, cytokinin, gibberellin, abscisic acid) that drives morpho-physiological changes in the plant host for increased nutrient use efficiency [ 12 , 53 , 73 ].…”

Section: Microbial Inoculants To Mitigate Drought Stress In Agroecosy...mentioning

confidence: 99%

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Mechanisms and Applications of Bacterial Inoculants in Plant Drought Stress Tolerance

et al. 2023

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Agricultural systems are highly affected by climatic factors such as temperature, rain, humidity, wind, and solar radiation, so the climate and its changes are major risk factors for agricultural activities. A small portion of the agricultural areas of Brazil is irrigated, while the vast majority directly depends on the natural variations of the rains. The increase in temperatures due to climate change will lead to increased water consumption by farmers and a reduction in water availability, putting production capacity at risk. Drought is a limiting environmental factor for plant growth and one of the natural phenomena that most affects agricultural productivity. The response of plants to water stress is complex and involves coordination between gene expression and its integration with hormones. Studies suggest that bacteria have mechanisms to mitigate the effects of water stress and promote more significant growth in these plant species. The underlined mechanism involves root-to-shoot phenotypic changes in growth rate, architecture, hydraulic conductivity, water conservation, plant cell protection, and damage restoration through integrating phytohormones modulation, stress-induced enzymatic apparatus, and metabolites. Thus, this review aims to demonstrate how plant growth-promoting bacteria could mitigate negative responses in plants exposed to water stress and provide examples of technological conversion applied to agroecosystems.

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Section: Stress Tolerance Mechanisms Mediated By Plant Growth-promoti...mentioning

confidence: 99%

Section: Stress Tolerance Mechanisms Mediated By Plant Growth-promoti...mentioning

confidence: 99%

Section: Microbial Inoculants To Mitigate Drought Stress In Agroecosy...mentioning

confidence: 99%

Section: Microbial Inoculants To Mitigate Drought Stress In Agroecosy...mentioning

confidence: 99%

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Mechanisms and Applications of Bacterial Inoculants in Plant Drought Stress Tolerance

et al. 2023

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“…In rice, a 50% reduction in N and P fertilization resulted in better nutrient absorption and chlorophyll content (Naher et al, 2018). Additionally, the use of Bacillus amyloliquefaciens combined with 50% CF changed the hormonal behavior of oil palm seedlings in Amazonian climatic conditions, increasing IAA levels by 66%, shoot dry matter by 110%, and root dry matter by 123% and improving macro-and micronutrient uptake (Lima et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Bacillus cereus Improves Performance of Brazilian Green Dwarf Coconut Palms Seedlings With Reduced Chemical Fertilization

et al. 2021

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Coconut production in the Amazon requires the knowledge and development of sustainable technologies to alleviate the detrimental effects of inorganic chemical fertilizers and intensive farming practices. In this study, we investigated the effects of plant growth-promoting rhizobacteria (PGPR) isolated from coconut seedlings on nutrient use efficiency (NUE) and physiological mechanisms related to biomass accumulation of seedlings grown with reduced inorganic fertilizer levels. Of the 96 PGPR isolates tested on rice plants, the isolate Bacillus cereus (UFRABC40) was selected, as it resulted in the most significant gain in growth variables. In a commercial coconut tree nursery, we subjected seedlings to two treatments, both with seven replications: control 100% NPK chemical fertilizer (CF) and B. cereus + 50% NPK CF. The results indicated that the inoculation increased phytohormone levels [190% indole acetic acid (IAA), 31% gibberellic acid GA3, and 17% gibberellic acid GA4] and leaf gas exchange [48% by assimilation of CO2 (A), 35% stomatal conductance to water vapor (gs), 33% transpiration, and 57% instantaneous carboxylation efficiency] in leaves. Furthermore, growth parameters (shoot, root, and total dry weight, height, and diameter) and macro- and micronutrient levels (95% N, 44% P, 92% K, 103 Ca, 46% Fe, 84% B) were improved. Our results show the potential ability of strain Bacillus cereus UFRABC40 to promote the growth performance of coconut seedlings under decreased application of inorganic fertilizers. The application of microbial-based products in coconut seedling production systems improves plants’ physiological performance and the efficiency of nutrient use.

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Co‐inoculation of soybean with Bradyrhizobium spp. and Amazonian strains of Trichoderma asperellum and Bacillus amyloliquefaciens increases the productivity and profitability of the crop

Leite,

Hungria,

Leite

et al. 2023

Crop Science

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Co‐inoculation of soybean with plant growth‐promoting microorganisms has the potential to increase yield, and the Amazon is a biome rich in these beneficial microorganisms. Soybean is the most important grain crop in Brazil and is highly benefited by inoculation with Bradyrhizobium spp. strains, both of which represent exotic symbiotic partners. The objective of this study was to evaluate the effects of soybean co‐inoculation with Amazonian strains of Trichoderma asperellum and Bacillus amyloliquefaciens. Greenhouse and field experiments were conducted during the 2020 and 2021 crop seasons in Brazil, respectively. The experimental design was completely randomized in the greenhouse, and randomized blocks were used in the field, both with 3 × 2 factorial schemes. Standard inoculation with Bradyrhizobium and co‐inoculation with T. asperellum and B. amyloliquefaciens was considered the first factor, and the second factor was represented by phosphate fertilization (0 and 100 kg ha−1 of P2O5). The root system volumes were 25% and 17% higher than those of the standard inoculation with T. asperellum and B. amyloliquefaciens, respectively. In 2020, co‐inoculation with T. asperellum increased yield by 15%, plant height by 27%, and net profit by up to 121 USD compared with standard inoculation. In 2021, co‐inoculation with T. asperellum and B. amyloliquefaciens resulted in increases in several growth parameters compared to those with standard inoculation, including 7% and 13% greater yields, and 159 USD and 309 USD increases in net profit, respectively. Our results indicate the possibility of expanding soybean co‐inoculation with local strains of Bacillus and Trichoderma, with benefits for productivity and profitability.

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Hormonal imbalance triggered by rhizobacteria enhance nutrient use efficiency and biomass in oil palm

Cited by 13 publications

References 49 publications

Mechanisms and Applications of Bacterial Inoculants in Plant Drought Stress Tolerance

Mechanisms and Applications of Bacterial Inoculants in Plant Drought Stress Tolerance

Bacillus cereus Improves Performance of Brazilian Green Dwarf Coconut Palms Seedlings With Reduced Chemical Fertilization

Co‐inoculation of soybean with Bradyrhizobium spp. and Amazonian strains of Trichoderma asperellum and Bacillus amyloliquefaciens increases the productivity and profitability of the crop

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