Abstract
The symbiotic rhizobium-legume relationship is mediated by an exchange of chemical signals that ultimately result in the formation of a nitrogen fixation root-derived nodule. During establishment of the symbiotic process, Rhizobium bacteria trigger the jasmonic acid and ethylene-dependent response pathways, leading to induced systemic resistance (ISR). Application of β-aminobutyric acid induces resistance in common bean plants to pathogen infection, via systemic acquired resistance (SAR). Both pathways (ISR and SAR) display a faster and/or stronger activation of plant defense responses against a second stimulus. This physiological condition, known as “priming,” is associated with enhanced resistance to a broad spectrum of biotic and/or abiotic types of stress. We discuss the role of BABA as a priming agent and within the rhizobium-legume relationship, as well as its effect on the development of nitrogen-fixing root nodules, and suggest the use of BABA, to help produce, through breeding, new common bean varieties.
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