Phenology‐regulated defence mechanisms as drivers for Fusarium basal rot in onion (Allium cepa)

Abstract

Fusarium basal rot (FBR) is one of the most destructive soilborne diseases in onion (Allium cepa) worldwide, and can occur throughout the entire crop cycle. The disease can cause pre-and postemergence seedling death and pre-and postharvest bulb rot, resulting in overall yield losses of between 30% and 50% (Dauda et al., 2018;Ozer et al., 2004). While Fusarium oxysporum f. sp. cepae is widely recognized as the main causal agent of FBR, F. proliferatum is considered an emerging pathogen associated with this disease (Caligiore-

Pathogenic Characterization of Three Fusarium Species Associated with Onion (Allium cepa L.) In Burkina Faso

“…These results match with those of other authors who have reported that there are Fusarium species responsible for seedling damping-off (O'Donnell et al, 2015;Kee et al, 2020;Dongzhen et al, 2020). Le et al (2022) reported that fumonisin B1 generate by Fusarium species appeared to be a virulence factor specific for the seedling stage.…”

“…Inoculations with F. oxysporum and F. acutatum caused severe seedling damping-off at 21 DAS and 45 DAS, but there was no difference between F. falciforme treatment and the control. Defense-related genes in seedlings were differently expressed depending on the aggressiveness of Fusarium isolates and the outcome of Fusarium basal rot is driven by the phenology of onion (Le et al, 2022). These results match with those of other authors who have reported that there are Fusarium species responsible for seedling damping-off (O'Donnell et al, 2015;Kee et al, 2020;Dongzhen et al, 2020).…”

Pathogenicity of Fusarium oxysporum and Fusarium proliferatum isolates from symptomless onions (Allium cepa) and onions with Fusarium basal rot

“…proliferatum isolates significantly decreased seedling emergence. In addition, Le et al (2022) recently showed that both F . oxysporum and F .…”

“…Our results agree with the previous study by Kintega et al (2020), who showed that inoculation of onion seeds with both F. oxysporum and F. proliferatum isolates significantly decreased seedling emergence. In addition, Le et al (2022) recently showed that both F. oxysporum and F. proliferatum isolates significantly reduced seedling root length and caused damping-off symptoms.…”

“…All the F. proliferatum isolates from onion were found to carry the fumonisin biosynthesis gene FUM1. Le et al (2022) recently provided experimental evidence on inhibition of root growth of onion seedlings by the toxin fumonisin B 1 , whereas no significant effect was observed after applying the toxin to mature onion bulbs. Thus, this toxin could function as a virulence factor on young onion seedlings.…”