Effects of beneficial microorganisms on lowland rice development

Abstract

Microorganisms can promote plant growth by increasing phytomass production, nutrient uptake, photosynthesis rates, and grain yield, which can result in higher profits for farmers. However, there is limited information available about the physiological characteristics of lowland rice after treatment with beneficial microorganisms in the tropical region. This study aimed to determine the effects of different beneficial microorganisms and various application forms on phytomass production, gas exchange, and nutrient contents in the lowland rice cultivar 'BRS Catiana' in a tropical region. The experiment was performed under greenhouse conditions utilizing a completely randomized design and a 7 × 3 + 1 factorial scheme with four replications. The treatments consisted of seven microorganisms, including the rhizobacterial isolates BRM 32113, BRM 32111, BRM 32114, BRM 32112, BRM 32109, and BRM 32110 and Trichoderma asperellum pooled isolates UFRA-06, UFRA-09, UFRA-12, and UFRA-52, which were applied using three different methods (microbiolized seed, microbiolized seed + soil drenched with a microorganism suspension at 7 and 15 days after sowing (DAS), and microbiolized seed + plant spraying with a microorganism suspension at 7 and 15 DAS) with a control (water). The use of microorganisms can provide numerous benefits for rice in terms of crop growth and development. The microorganism types and methods of application positively and differentially affected the physiological characteristics evaluated in the experimental lowland rice plants. Notably, the plants treated with the bioagent BRM 32109 on the seeds and on seeds + soil produced plants with the highest dry matter biomass, gas exchange rate, and N, P, Fe, and Mg uptake. Therefore, our findings indicate strong potential for the use of microorganisms in lowland rice cultivation systems in tropical regions. Currently, an additional field experiment is in its second year to validate the beneficial result reported here and the novel input sustainability.

Physio-Agronomic Characterization of Upland Rice Inoculated With Mix of Multifunctional Microorganisms

“…This result is positive and may provide a reduction in the demand for synthetic fertilizers. These fertilizers are expensive, finite, have low efficiency of use by plants and can cause environmental degradation (FAGERIA, 2006;NASCENTE et al, 2017b). In this sense, the use of multifunctional microorganisms can be a viable alternative in the search for sustainable agriculture with less use of synthetic inputs.…”

Microrganismos potenciais e incremento de biomassa em grama esmeralda (Zoysia japonica Steud.)

“…O efeito benéfico dos microrganismos em promover o crescimento vegetal é descrito por diversos autores (NASCENTE et al, 2017;KUMAR et al, 2018). Na produção comercial de tapetes de grama, após a colheita dos tapetes do ciclo anterior, objetiva-se um crescimento rápido dos estolões, raízes e parte aérea da grama, resultando na formação de tapetes, ao longo dos próximos ciclos, com qualidade satisfatória à comercialização (CARRIBEIRO, 2014).…”

“…Melhores resultados obtidos pela inoculação por rega podem estar relacionados ao maior tempo de contato do microrganismo com o sistema radicular do gramado, se comparado ao método de inoculação por imersão. Neste caso, o maior tempo de contato com a rizosfera favorece o encontro físico entre a bactéria e a planta, promovendo o estabelecimento do quorum sensing, um mecanismo regulatório que permite a adaptação microbiana por meio de sinalização química à condições instáveis, essa compreensão de sinais permite que células bacterianas individuais percebam a si e a outros indivíduos adaptando-se ao ambiente de crescimento, regulando o tamanho das populações, favorecendo a colonização inicial do tecido vegetal e favorecendo a expressão de genes associados a promoção do crescimento da plantas hospedeira (OLIVEIRA et al, 2003). Em grama, as variáveis e paramentos utilizados para avaliar crescimento ainda não são padronizados, assim nesse estudo adotou-se a análise de componentes principais (PCA) a fim de identificar as componentes principais (PC's) necessárias para explicar a variância total dos parâmetros examinados (KAISER, 1960).…”

“…Em pesquisas semelhantes, está rizobactéria também beneficiou o sistema radicular em plantas de arroz, induzindo aumentos de matéria seca (ESTRADA et al, 2013;NASCENTE et al, 2017;RÊGO et al, 2018). Em plantas de grama bermuda, quando tratadas com mistura de rizobactérias, o sistema radicular também apresentou maior desenvolvimento, com maiores incrementos, tanto em matéria seca como em comprimento de raízes (COY et al, 2014).…”

Characterization of antifungal metabolite phenazine from rice rhizosphere fluorescent pseudomonads (FPs) and their effect on sheath blight of rice

“…Rhizospheric beneficial bacteria are target-specific and they have been used as bioinoculants and biopesticides to enhance the plant enlargement and crop yield ( Gnanamanickam et al, 1998 , Shanmugaiah et al, 2006 , Nascente et al, 2017 ). Among the beneficial antagonistic microbial inhabitants, fluorescent pseudomonads (FPs) are drawn much attention worldwide, because of their plant growth promotion effectiveness and bio- control prospective with broad spectral activity to control of various plant pathogens by the manufacture of metabolites, siderophore and hydrogen cyanide ( Shanmugaiah et al, 2015 , Li et al, 2018 ).…”