Producción CyT
CONGRESO SAMIGE - EFFECT OF THE INOCULATION OF WATER STRESS TOLERANT PGPRs IN PEANUT (Arachis hypogaea L.) PLANTS UNDER CONDITIONS OF PHOSPHORUS AND DROUGHT STRESS IN MICROCOSM ASSAY
Congreso
Autoría:
Lopez, Agustin ; Furlan, Ana Laura ; LOSER, URSULA ANA ; Taurian, Tania ; Anzuay, Maria SoledadFecha:
2023Editorial y Lugar de Edición:
SAMIGEResumen *
In the semiarid pampas region of Argentina, peanut (Arachis hypogaea L.) crop undergoes frequent and unpredictable drought stress periods, with high probability of occurrence under future climate change projections. Also, low values of phosphorus were detected. Plant growth-promoting rhizobacteria (PGPR) are bacteria that can enhance plant growth and protect plant from abiotic stress. PGPR have some mechanisms to alleviate phosphorus deficit and drought stress, there are the phosphorus solubilization and the production of phytohormones and activity of 1-aminocyclopropane-1-carboxylic acid (ACC deaminase).The aim of this study was to analyze the beneficial effect of inoculation with water stress tolerant PGPRs on the growth and nutritional status of peanut plants exposed to P deficiency and drought in a microcosm assay.Three phosphate solubilizers Pseudomonas sp. SA-S-7, Pseudomonas sp. NVAM24 and Enterobacter sp. J49, have the ability of produce indol acetic acid (IAA), and ACC deaminase.Peanut plants grown in individual pots, containing 1,5 kg of non-sterile soil characterized by a low level of phosphorus (5ppm) as a support, were inoculated with Pseudomonas sp. SA-S-7, Pseudomonas sp. NVAM24 and Enterobacter sp. J49. All plants were inoculated with Bradyrhizobium sp SEMIA 6144, including uninoculated control. Plants were grown under controlled conditions. The treatments were deficit of phosphorus (PTC), control where it was added soluble phosphorus (PSOL), and control irrigation (RN) and drought stress (EH) where the irrigation was suspended in R1. The plants were harvested when the plants of EH treatments presented wilting symptoms. The following parameters were determined in the plants: relative water content (RWC), shoot and root dry weight, aerial P content, N content, chlorophyll content, number of nodules and nodules dry weight.Results indicated significant increases in RWC and shoot and root dry weight in drought conditions (EH) in peanut plants inoculated with Pseudomonas sp. SA-S-7, compared with uninoculated plants. Also, this strain has the higher content of chlorophyll in plants in control irrigation (RN). SA-S-7 achieved this results in deficit of phosphorus conditions (PTC). In the other hand, plants inoculated with NVAM24 strain presented significant increases in number of nodules, nodules dry weight and P content, compared with uninoculated plants in control irrigation (RN).In conclusion, the inoculation of peanut plants with PGPRs enhance some parameters values against uninoculated plants. Pseudomonas sp. SA-S-7 could be considered an option as a biofertilizer in peanut plants in drought stress and phosphorus deficit conditions. Información suministrada por el agente en SIGEVAPalabras Clave
Drought stresspeanutPGPRphosphorus deficit