Salicylic and citric acid as promising new stimulants for resin tapping in maritime pine (Pinus pinaster Ait.)

Aim of the study: We tested alternative active principles to most widely used resin tapping stimulant which contains sulphuric acid. also studied effect wounding in five-year-old Pinus pinaster seedlings with a microtapping method.Area The experiment was carried out at Universidad Politécnica de Madrid Spain.Material and Methods: consisted six treatments: control (no no wounding), wound stimulant), pines stimulated acid, ethrel, salicylic acid citric evaluated yield differentiating between released internal (resin retained within xylem), physiological status tree.Main Results: Wounded plants produced on average three times more than plants. Plants acids showed highest 15% those mainly because higher. Tree diameter affected thicker trees resin. did not observe any significant treatments stomatal conductance only marginal (p<0.10) water potential.Research highlights: Salicylic seem be promising stimulants for activity further field experiments adult trees.Keywords: acid; ethrel; pine resin; microtapping; wounding; potential; conductance.Abbreviations used: TR: total content; RR: IR: gs: conductance; Ψleaf: midday leaf potential.