Rhizobacteria improve sugarcane growth and photosynthesis under well-watered conditions

Autor(es)

Rampazzo, P. E. ^[1] ; Marcos, F. C. C. ^[2] ; Cipriano, M. A. P. ^[3] ; Marchiori, P. E. R. ^[1] ; Freitas, S. S. ^[3] ; Machado, E. C. ^[1] ; Nascimento, L. C. ^{[4, 5]} ; Brocchi, M. ^[6] ; Ribeiro, R. V. ^[2]

Afiliação do(s) autor(es)

^[1] Agron Inst IAC, Ctr Res & Dev Ecophysiol & Biophys, Lab Plant Physiol Coaracy M Franco, Campinas, SP - Brazil

^[2] Univ Campinas UNICAMP, Inst Biol, Dept Plant Biol, R Monteiro Lobato 255, BR-13083962 Campinas, SP - Brazil

^[3] IAC, Ctr Res & Dev Soil & Environm Resources, Campinas, SP - Brazil

^[4] IB UNICAMP, Genom & Express Lab, Campinas, SP - Brazil

^[5] Univ Estadual Campinas, Cent Lab High Performance Technol LaCTAD, Campinas, SP - Brazil

^[6] IB UNICAMP, Lab Trop Dis, Dept Genet Evolut Microbiol & Immunol, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Annals of Applied Biology; v. 172, n. 3, p. 309-320, MAY 2018.
• Citações Web of Science: 2

Resumo

Morpho-physiological changes caused by particular plant growth-promoting rhizobacteria were evaluated in sugarcane plants under varying water availability. Under well-watered conditions, we have found one rhizobacteria isolate (IAC-RBcr5) able to enhance root dry matter and photosynthesis of sugarcane plants. The IAC-RBcr5 genome was sequenced and high similarity was found with Pseudomonas putida GB-1. Based on increased root system size of inoculated plants, we hypothesised that sugarcane plants inoculated with IAC-RBcr5 would have improved performance under water deficit. Although IAC-RBcr5 had improved plant leaf CO2 assimilation under water shortage, inoculation caused reduction of biomass accumulation in sugarcane. The negative influence of water deficit on shoot growth rate and root traits such as volume, area, diameter, length and specific root area was higher in plants treated with IAC-RBcr5 as compared to non-inoculated ones. However, rhizobacteria-induced improvements in leaf and root proline contents would represent a strategy for storing carbon and nitrogen during low water availability and helping both organisms to resume their metabolism after rehydration. In conclusion, we found and identified a rhizobacterium able to improve growth and photosynthesis of sugarcane plants. Such benefit for plant growth was lost under low water availability as a likely consequence of increased carbon-energy demand by rhizobacteria and their sensitivity to drought. (AU)

• Processo FAPESP: 08/57495-3 - Integrando características fisiológicas, morfológicas e anatômicas para entender o rendimento diferencial de sacarose em genótipos de cana-de-açúcar
• Beneficiário: Eduardo Caruso Machado
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático
• Processo FAPESP: 14/13412-8 - Salmonella enterica: importância de NAPS na patogenicidade e atenuação da virulência
• Beneficiário: Marcelo Brocchi
• Modalidade de apoio: Auxílio à Pesquisa - Regular