Upland rice seedling performance promoted by multifunctional microorganisms

Abstract

Multifunctional microorganisms can contribute to the development of plant root systems and positively affect the grain yield of crops. However, studies of the use of these microorganisms to benefit root development in rice plants are scarce. The objective of this study was to determine the effect of rhizobacterial inoculation of the seeds on the root development of upland rice seedlings. The experiment was carried out in the agricultural microbiology laboratory of Embrapa Rice and Beans, and we adopted a completely randomized design with eight replications. The treatments consisted of the inoculation of rice seeds with the rhizobacteria 1. Pseudomonas fluorescens (BRM 32111), 2. Burkholderia pyrrocinia (BRM 32113), 3. Serratia sp. (BRM 32114), 4. Bacillus sp. (1301), 5. Azospirillum brasilense (Ab-V5), 6. Azospirillum sp. (1381), and a 7. control treatment (without microorganisms). Treatment using the microorganism Azospirillum sp. (1381) provided the longest roots, greatest root volume and highest total dry mass of roots, at 86.34, 111.53 and 29.41%, respectively, significantly superior to the control treatment. In addition, treatments Ab-V5 and Bacillus sp. (1301) resulted in a root diameter of 13.81 and 13.06%, respectively, larger than that of the control treatment. The use of these multifunctional microorganisms was efficient for promoting the root development of rice seedlings.

Desenvolvimento inicial de arroz de terras altas inoculado e coinoculado com rizobactérias multifuncionais

“…These factors can also impact crop yield (Silva et al, 2022b). In a study conducted by J. P. T. Fernandes et al (2021a), they observed greater root length of seedlings with multifunctional rhizobacteria inoculation in upland rice culture, including an isolate of the genus Azospirillum spp. The authors also observed a greater root diameter with the inoculation of isolates Ab-V5 and BRM 63573, which were 13.81% and 13.06%, respectively, higher than the control treatment (without microorganisms).…”

“…have shown promising results. They can provide greater root diameter of seedlings (J. P. T. Fernandes et al, 2021a) and higher biomass production (J. Fernandes et al, 2021b) in upland rice plants, compared to the control treatment (without rhizobacteria).…”

Interação de plântulas de soja com rizobactérias benéficas

“…Figure 2 displays images of the root system of soybean seedlings treated with the beneficial rhizobacteria evaluated in this study. Similar results were obtained for the root system of rice and corn treated with Azospirillum sp., showing an increase of 86.3% and 43.7%, respectively (Fernandes et al, 2021;Cruz et al, 2022) Serratia marcescens (BRM 32114), and Bacillus spp. (BRM63573) showed a significant increase in total dry matter (MST) of 36.6%, 35.9%, and 32.4%, respectively, and in aboveground dry matter (MSPA) by 39.0%, 43.8%, and 41.0%, respectively, compared to the control treatment (Table 2).…”

“…They contribute to biological nitrogen fixation (Pacentchuck et al, 2020), inorganic phosphate solubilization, and organic phosphate mineralization, as well as inhibition of ethylene production (Santoyo et al, 2016), and mitigation of oxidative, saline, and water stresses. Recent studies have demonstrated the beneficial effects of multifunctional microorganisms in crops such as rice (Fernandes et al, 2021), maize (Cruz et al, 2022), common beans (Rezende et al, 2021), soybeans (Chagas et al, 2022), among others. For soybean seed microbiolization, the seeds were immersed in bacterial suspensions (Filippi et al, 2011) produced by cultivating the mentioned rhizobacteria on solid medium (nutrient agar).…”

“…In this context, the exploration of technological alternatives that reduce the reliance on synthetic inputs and environmental contamination has become the focus of numerous research endeavors (Ballabio et al, 2013). Microorganisms can also contribute to the initial development of agricultural crops, with positive repercussions on grain productivity (Fernandes et al, 2021). However, there is still a limited number of studies on the use of microorganisms in the initial growth of soybeans.…”