Coordinated activation of the metabolic pathways induced by LED blue light in citrus fruit

Albedo- and Flavedo-Specific Transcriptome Profiling Related to Penicillium digitatum Infection in Citrus Fruit

“…As expected, an examination of the transcriptome differences between albedo and flavedo at fruit harvest showed the induction of both cuticular waxes and phenylpropanoids, which are involved in natural or elicited resistance against P. digitatum in citrus fruit [ 5 , 10 , 18 , 19 , 28 , 29 , 30 ] in flavedo versus albedo ( Table 1 , Figure 4 A). This result agreed with the induction of energy metabolism, which is relevant for both the synthesis of secondary metabolites and the elicitation of resistance against P. digitatum in citrus fruit [ 13 ]. Moreover, favoring the cell energetics in citrus fruit peel induces plant defense responses against pathogens [ 31 ].…”

“…Thus, in relation to the preformed protective fruit barrier against infection caused by phytopathogenic fungi, it is worth noting that the outer peel part of mature citrus fruit is richer than albedo in relevant natural compounds, such as cuticular waxes or phenolic-related compounds [ 15 , 16 ]. Moreover, in line with the present work, it is remarkable that the capability of both peel tissues to provide energy differs [ 17 , 18 ], which is relevant for the elicitation of plant defense responses against pathogens in fruit [ 13 ]. Some information also indicates differences between the capability of flavedo and albedo to induce specific defense-related responses against P. digitatum, which involves pathogenesis-related (PR) proteins [ 19 ] or the enzymatic antioxidant system [ 14 ].…”

“…Although monoterpenes may stimulate P. digitatum infection [ 32 ], many terpenoids protect plants from pathogen attack [ 33 ]. Moreover in citrus fruit, terpenoid metabolism has been linked with elicited resistance [ 13 ]. Lipid metabolism, which involves lipids related to the cuticle, and also to fatty acid degradation, lipid β-oxidation, and α-linolenic acid metabolism, which are relevant for jasmonates biosynthesis, was also induced ( Table 1 , Figure 4 ).…”

“…Transcriptomic studies that focus on either analyzing molecular responses to P. digitatum [ 5 , 8 ] or mechanisms related to the elicitation of resistance [ 10 , 11 , 12 , 13 ] have been performed in recent years on citrus fruit peel. Yet, despite the inner peel part (albedo) being more susceptible to P. digitatum infection than the outer colored part (flavedo) [ 14 ], and both the composition and morphology of both peel tissue differing [ 15 , 16 ], no information about the different responses of each specific peel tissue to the pathogen is available.…”

Control of postharvest diseases caused by Penicillium spp. with myrtle leaf phenolic extracts: in vitro and in vivo study on mandarin fruit during storage

“…Ballester et al ., 43 highlighted the importance of the availability of iron (Fe(II)) in the host in P. digitatum development and suggested the restriction of micronutrients trough metal chelation as a new possible target in fungal control. The role of metal chelation in the control of rot development was also highlighted by Lafuente et al 44 . These authors suggested that the activation of ferrochelatase induced by a treatment with LED blue light may be involved in the elicitation of resistance against P. digitatum .…”