Inoculación con bacterias PGPR en la respuesta fisiológica de plantas de arándano (Vaccinium corymbosum L.) bajo diferentes condiciones de riego
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Date
2026
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Universidad de Concepción
Abstract
El estrés hídrico es uno de los principales factores que limita la productividad de cultivos frutales, especialmente en escenarios de creciente escasez de agua y altas temperaturas, por lo que resulta necesario evaluar estrategias que mitiguen sus efectos fisiológicos. El objetivo de este estudio fue evaluar la respuesta fisiológica de plantas jóvenes de arándano (Vaccinium corymbosum L. cv. Legacy) inoculadas con Pseudomonas koreensis sometidas a diferentes condiciones de riego durante una postcosecha bajo altas temperaturas. El ensayo se realizó en condiciones de invernadero bajo un diseño de parcelas divididas, considerando tratamientos de reposición hídrica equivalentes al 30% y 50% de la capacidad del contenedor entre eventos de riego, con y sin inoculación de Pseudomonas koreensis AG-97. Se registraron variables ambientales y fisiológicas, incluyendo temperatura del aire, humedad relativa, déficit de presión de vapor, potencial hídrico del tallo, conductancia estomática, eficiencia del fotosistema II, índice de reflectancia fotoquímica y contenido volumétrico de agua en el suelo. Los resultados mostraron diferencias significativas asociadas al tratamiento de riego, principalmente en el potencial hídrico del tallo y el contenido volumétrico de agua en el suelo. Asimismo, la inoculación con PGPR contribuyó a una mejor tolerancia al estrés hídrico, evidenciada por valores significativamente superiores de potencial hídrico del tallo en comparación con plantas no inoculadas. En conclusión, la inoculación con Pseudomonas koreensis AG-97 representa una alternativa prometedora para mitigar los efectos del déficit hídrico en el cultivo de arándano, aportando información relevante para optimizar su manejo bajo condiciones de disponibilidad limitada de agua.
Water stress is one of the main factors limiting the productivity of fruit crops, particularly under scenarios of increasing water scarcity and high air temperature, highlighting the need to evaluate strategies that mitigate its physiological effects. The objective of this study was to assess physiological responses of young blueberry plants to Pseudomonas koreensis inoculation under different irrigation regimes during postharvest under simulated warmer autumn conditions. The experiment was conducted under greenhouse conditions using a split-plot design, considering irrigation treatments equivalent to 30% and 50% of container capacity between irrigation events, with and without inoculation of Pseudomonas koreensis strain AG-97. Environmental and plant physiological variables were recorded, including air temperature, relative humidity, vapor pressure deficit, stem water potential, stomatal conductance, photosystem II efficiency, photochemical reflectance index, and volumetric soil water content. The results showed significant differences associated with irrigation treatments, mainly in stem water potential and volumetric soil water content. In addition, PGPR inoculation contributed to improved tolerance to water stress, evidenced by significantly higher stem water potential values compared to non-inoculated plants. In conclusion, inoculation with Pseudomonas koreensis AG-97 represents a promising alternative to mitigate the effects of water deficit in blueberry cultivation, providing relevant information for optimizing crop management under conditions of limited water availability.
Water stress is one of the main factors limiting the productivity of fruit crops, particularly under scenarios of increasing water scarcity and high air temperature, highlighting the need to evaluate strategies that mitigate its physiological effects. The objective of this study was to assess physiological responses of young blueberry plants to Pseudomonas koreensis inoculation under different irrigation regimes during postharvest under simulated warmer autumn conditions. The experiment was conducted under greenhouse conditions using a split-plot design, considering irrigation treatments equivalent to 30% and 50% of container capacity between irrigation events, with and without inoculation of Pseudomonas koreensis strain AG-97. Environmental and plant physiological variables were recorded, including air temperature, relative humidity, vapor pressure deficit, stem water potential, stomatal conductance, photosystem II efficiency, photochemical reflectance index, and volumetric soil water content. The results showed significant differences associated with irrigation treatments, mainly in stem water potential and volumetric soil water content. In addition, PGPR inoculation contributed to improved tolerance to water stress, evidenced by significantly higher stem water potential values compared to non-inoculated plants. In conclusion, inoculation with Pseudomonas koreensis AG-97 represents a promising alternative to mitigate the effects of water deficit in blueberry cultivation, providing relevant information for optimizing crop management under conditions of limited water availability.
Description
Tesis presentada para optar al grado de Magíster en Ciencias Agronómicas
Keywords
Riego Administración, Arándanos Chile, Pseudomonas