Multifaceted Impacts of Plant-Beneficial Pseudomonas spp. in Managing Various Plant Diseases and Crop Yield Improvement

Abstract

The modern agricultural system has issues with the reduction of agricultural productivity due to a wide range of abiotic and biotic stresses. It is also expected that in the future the entire world population may rapidly increase and will surely demand more food. Farmers now utilize a massive quantity of synthetic fertilizers and pesticides for disease management and to increase food production. These synthetic fertilizers badly affect the environment, the texture of the soil, plant productivity, and human health. However, agricultural safety and sustainability depend on an ecofriendly and inexpensive biological application. In contrast to synthetic fertilizers, soil inoculation with plant-growth-promoting rhizobacteria (PGPR) is one of the excellent alternative options. In this regard, we focused on the best PGPR genera, Pseudomonas, which exists in the rhizosphere as well as inside the plant’s body and plays a role in sustainable agriculture. Many Pseudomonas spp. control plant pathogens and play an effective role in disease management through direct and indirect mechanisms. Pseudomonas spp. fix the amount of atmospheric nitrogen, solubilize phosphorus and potassium, and also produce phytohormones, lytic enzymes, volatile organic compounds, antibiotics, and secondary metabolites during stress conditions. These compounds stimulate plant growth by inducing systemic resistance and by inhibiting the growth of pathogens. Furthermore, pseudomonads also protect plants during different stress conditions like heavy metal pollution, osmosis, temperature, oxidative stress, etc. Now, several Pseudomonas-based commercial biological control products have been promoted and marketed, but there are a few limitations that hinder the development of this technology for extensive usage in agricultural systems. The variability among the members of Pseudomonas spp. draws attention to the huge research interest in this genus. There is a need to explore the potential of native Pseudomonas spp. as biocontrol agents and to use them in biopesticide development to support sustainable agriculture.

Reduction of flavonoid content in honeysuckle via Erysiphe lonicerae-mediated inhibition of three essential genes in flavonoid biosynthesis pathways

“…Historically, plant disease research, particularly in economically significant crops such as food staples and large fruits, has predominantly focused on yield impact. Yield, the most conventional and straightforward indicator of agricultural productivity, has long been the gold standard for assessing the extent of disease damage and the effectiveness of control methods ( Large, 1966 ; Chiarappa et al., 1972 ; Gaunt, 1995 ; Koenning and Wrather, 2010 ; Mehmood et al., 2023 ; Sajitha et al., 2024 ). However, in the case of medicinal plants like honeysuckle, which do not fall into the categories of food or fruit, the scope of concern should broaden beyond yield.…”

Biochar and Seed Priming Technique with Gallic Acid: An Approach toward Improving Morpho-Anatomical and Physiological Features of Solanum melongena L. under Induced NaCl and Boron Stresses

“…Disruption in plant growth and physiological activities of are primarily due to abiotic stress. 99 , 100 These disturbances may occur when the plant is exposed to physical dehydration and the subsequent osmotic effects that block the passage of water in xylem vessels via ion toxicity. 101 We observed a significant reduction in LDW, LAI, and LAR and a nonsignificant decrease in LFW and LMC under boron and salinity stresses.…”

Screening and characterization of biocontrol bacteria isolated from Ageratum conyzoides against Collectotrichum fructicola causing Chinese plum (Prunus salicina Lindl.) anthracnose

“…Conventional methods for controlling crop diseases mainly rely on the use of chemical pesticides. However, increasing evidence suggests that biological control using beneficial microorganisms (bacteria, fungi, and yeasts) is a safe and promising approach for the management of plant diseases ( Liu et al, 2013 ; Radhakrishnan et al, 2017 ; Hong et al, 2022 ; Mehmood et al, 2023 ). Particularly, endophytic bacteria have been isolated from various medicinal plants, which have potential biological control properties ( Shurigin et al, 2021 ; Tripathi et al, 2022 ; Kashyap et al, 2023 ).…”

“…Plant-beneficial bacteria that protect plants from disease by living as rhizospheric or endophytic microorganisms, such as Bacillus , Streptomyces , Pseudomonas , and Burkholderia have been well documented ( Ryu et al, 2014 ; Boukaew et al, 2017 ; Guevara-Avendaño et al, 2019 ; Jin et al, 2019 ; Soo et al, 2021 ; Choub et al, 2022 ; Mehmood et al, 2023 ; Rodríguez-Cisneros et al, 2023 ). Some of the bacteria in the genera Bacillus and Pseudomonas have been demonstrated to have the ability to control anthracnose ( Jin et al, 2019 ; Soo et al, 2021 ; Choub et al, 2022 ).…”