The effect of elicitation
in butterhead lettuce on carotenoid and
polyphenol metabolism was evaluated. Different concentrations of arachidonic
acid (AA), salicylic acid (SA), methyl jasmonate (MJ) (15, 45, and
90 μM) and Harpin protein (HP) (30, 60, and 120 mg/L) were applied
on red and green butterhead lettuces. Total phenolic and flavonoid
content were incremented by MJ (90 μM) in green and red lettuce.
Carotenoids were increased in red lettuce (AA; 45 μM). Green
lettuce modifies their phenolic acid profile after elicitation with
AA and MJ; meanwhile, red lettuce incremented mainly in hydroxycinnamic
acids and flavonols, MJ being the elicitor with the highest effect.
There was an impact on secondary metabolite enzyme gene transcript
concentration. Phenylalanine ammonia-lyase (PAL) and lycopene beta
cyclase (LBC) increased in both varieties after elicitation. A relationship
between phytochemical increase and the activation of the metabolic
pathways after elicitation in butterhead lettuce was observed.
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