Abstract
Fungal species from the genus Fusarium are important soil-borne pathogens worldwide, causing significant economic losses in diverse crops. The need to find sustainable solutions against this disease has led to the development of new strategies—for instance, the use of biocontrol agents. In this regard, non-pathogenic Fusarium isolates have demonstrated their ability to help other plants withstand subsequent pathogen attacks. In the present work, several Fusarium isolates were evaluated in climatic chambers to identify those presenting low or non-pathogenic behavior. The inoculation with a low-pathogenic isolate of the fungus did not affect the development of the plant, contrary to the results observed in plants inoculated with pathogenic isolates. The expression of defense-related genes was evaluated and compared between plants inoculated with pathogenic and low-pathogenic Fusarium isolates. Low-pathogenic isolates caused a general downregulation of several plant defense-related genes, while pathogenic ones produced an upregulation of these genes. This kind of response to low-pathogenic fungal isolates has been already described for other plant species and fungal pathogens, being related to enhanced tolerance to later pathogen attacks. The results here presented suggest that low-pathogenic F. oxysporum and F. solani isolates may have potential biocontrol activity against bean pathogens via induced and systemic responses in the plant.
Highlights
Common bean (Phaseolus vulgaris L.) is one of the most important legume crops worldwide, being the third most produced legume after soybean (Glycine max (L.) Merr.) and peanut (Arachis hypogea L.).The harvested area of beans has steadily increased in the last few decades, from 23 million hectares in 1999 to 36 million hectares in 2017
This study aims to analyze and compare the expression of P. vulgaris defense-related genes when inoculated with indigenous pathogenic and low-pathogenic isolates of Fusarium
Results and F9 (F. oxysporum) yielded the lowest dry root weight compared to the control (Figure 2)
Summary
Common bean (Phaseolus vulgaris L.) is one of the most important legume crops worldwide, being the third most produced legume after soybean (Glycine max (L.) Merr.) and peanut (Arachis hypogea L.). The harvested area of beans has steadily increased in the last few decades, from 23 million hectares in 1999 to 36 million hectares in 2017. The production increased from 15 million tons in 1987 to over 31 million tons in 2017. In Europe, Spain is the ninth country in terms of production, with 19,675 tons in 2017 [1]. León is a region located in the northwest of Spain and the main common bean producer in Spain both in quality and quantity, with almost 60% of the national production in. The Protected Geographical Indication (PGI) “Alubia La Bañeza-León,” (PGI-ALBL)
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