Abstract
The expression of the enzyme 1-aminocylopropane-1-carboxylate (ACC) deaminase, and the consequent modulation of plant ACC and ethylene concentrations, is one of the most important features of plant-associated bacteria. By decreasing plant ACC and ethylene concentrations, ACC deaminase-producing bacteria can overcome some of the deleterious effects of inhibitory levels of ACC and ethylene in various aspects of plant-microbe interactions, as well as plant growth and development (especially under stressful conditions). As a result, the acdS gene, encoding ACC deaminase, is often prevalent and positively selected in the microbiome of plants. Several members of the genus Pseudomonas are widely prevalent in the microbiome of plants worldwide. Due to its adaptation to a plant-associated lifestyle many Pseudomonas strains are of great interest for the development of novel sustainable agricultural and biotechnological solutions, especially those presenting ACC deaminase activity. This manuscript discusses several aspects of ACC deaminase and its role in the increased plant growth promotion, plant protection against abiotic and biotic stress and promotion of the rhizobial nodulation process by Pseudomonas. Knowledge regarding the properties and actions of ACC deaminase-producing Pseudomonas is key for a better understanding of plant-microbe interactions and the selection of highly effective strains for various applications in agriculture and biotechnology.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
The endophytes, P. brassicacearum YsS6 and P. migulae 8R6, both presenting ACC deaminase activity, promoted tomato plant growth in the absence of stress conditions and induced the accumulation of much higher fresh and dry biomass, higher chlorophyll contents, and a greater number of flowers and buds in tomato plants subjected to salt stress compared to non-inoculated plants or those inoculated with the respective Pseudomonas acdS− mutants [17]
Beneficial plant-associated Pseudomonas containing ACC deaminase are of great interest for the study of plant-microbe interactions and for the development of novel inoculants for agricultural and biotechnological applications, especially those subjected to stress conditions
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. One way to address this challenge resides with the selection of Pseudomonas strains presenting the ability to manipulate plant hormone concentrations, the gaseous plant hormone ethylene, which is an important regulator of multiple aspects of plant development as well as stress resistance and plant-microbe interactions [3,4]. In this regard, Microorganisms 2021, 9, 2467. Several aspects of Pseudomonas ACC deaminase production and its important role in plant-microbe interactions are reviewed in detail
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