Infection capacities in orange-pathogen relationship: Compatible (Penicillium digitatum) and incompatible (Penicillium expansum) interactions
Torres Sanchis, Rosario
MetadataShow full item record
Penicillium digitatum and Penicillium expansum are the most devastating pathogens of citrus and pome fruits, respectively. Whereas P. digitatum is a very specific pathogen that only infects Citrus fruits, P. expansum has a broader host range but has not been reported to be infectious in Citrus. To determine
the responses of fruits and the infection capacities of both moulds, two varieties of oranges at different maturity stages, different inoculum concentrations and two different storage temperatures were studied. In compatible interactions, no significant differences in rot dynamics among harvests were found with a 107 conidia mL−1 inoculum concentration at both temperatures tested (20 °C and 4 °C). However, at other inoculum concentrations, significant differences in rot dynamics were found, especially in immature fruits. Incompatible interactions showed that P. expansum could infect oranges at commercial maturity in both tested varieties. Decay incidence and severity were higher at 4 °C than at 20 °C. In addition to infection capacity studies, histochemical tests were performed to detect wound-healing compounds for both pathogens. A positive reaction for lignin was detected for both pathogens in immature oranges over a short period (48 h). In all cases, no reactions were found in control samples. Our results indicate that pathogen concentration, host maturity and storage temperature can play important roles in the defence mechanisms of fruit. Furthermore, to our knowledge, this is the first work that demonstrates that P. expansum can infect oranges under favourable conditions.
Is part ofFood Microbiology, 2012, vol. 29, núm. 1, p. 56-66
Showing items related by title, author, creator and subject.
Wound response in orange as a resistance mechanism against Penicillium digitatum (pathogen) and P. expansum (non-host pathogen) Vilanova, Laura; Torres Sanchis, Rosario; Viñas Almenar, Inmaculada; González-Candelas, Luis; Usall i Rodié, Josep; Fiori, S.; Solsona Aixalà, Cristina; Teixidó i Espasa, Neus (Elsevier, 2013)Penicillium digitatum is the most devastating postharvest pathogen of citrus. In addition, Penicillium expansum is the main pathogen of pome fruit, although recent studies have demonstrated its ability to infect oranges ...
Effect of fruit maturity stage of orange on the wound response to Penicillium digitatum (pathogen) and P. expansum (non-host pathogen) Vilanova, Laura; Torres Sanchis, Rosario; Usall i Rodié, Josep; Teixidó i Espasa, Neus; González-Candelas, Luis; Viñas Almenar, Inmaculada; Fiori, S. (International Society for Horticultural Science, 2014)Penicillium digitatum and P. expansum are postharvest necrotrophic fungi that require wounds to infect the fruit. Therefore, injuries caused during harvesting and postharvest handling provide an optimal locus for infection. ...
Increasing maturity reduces wound response and lignification processes against Penicillium expansum (pathogen) and P. digitatum (non-host pathogen) infection in apples Vilanova, Laura; Viñas Almenar, Inmaculada; Torres Sanchis, Rosario; Usall i Rodié, Josep; Burón Moles, Gemma; Teixidó i Espasa, Neus (Elsevier, 2014)Penicillium expansum is the main postharvest pathogen of pome fruit and is a necrotrophic fungus that requires wounds to infect the fruit. Therefore, injuries caused during harvest and postharvest handling provide an optimal ...