Bacillus strain selection with plant growth-promoting mechanisms as potential elicitors of systemic resistance to gray mold in pepper plants
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Fecha
2020
Autores
Márquez, Robert
Lorena Blanco, Erika
Aranguren, Yani
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Editor
Elsevier
Resumen
Certain soil bacteria produce beneficial effects on the growth and health of plants; hence, their use is
steadily increasing. Five strains of Bacillus with plant growth-promoting potential were selected in this
study, which produced indole-3-acetic acid levels below 50 mg.mL 1. On the other hand, while only
strains M8 and M15 dissolved phosphorus, the latter was the only strain that did not produce siderophores.
Only strains M8 and M16 significantly inhibited the in vitro growth of Botrytis cinerea and
Fusarium solani phytopathogens, whose inhibition ranges fluctuated between 60% and 63% for strains
M8 and M16 against B. cinerea and between 40% and 53% for strains M8 and M16 against F. solani.
Based on these results, the need to implement resistance induction against gray mold on pepper plants
was determined using strains M8 and M16. In this case, strain M16 inhibited the propagation of the
necrotic spot by approximately 70%, whereas strain M8 significantly reduced the superoxide dismutase
activity in systemic leaves, which substantially increased in plants inoculated with strain M8 and infected
with the pathogen. Accordingly, the use of native rhizobacteria may entail biotechnological progress for
the integrated management of crops in agriculture industry.
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Palabras clave
Bacillus, Botrytis cinerea, Capsicum annuum, Induced systemic resistance, Plant growth-promoting rhizobacteria