Toward Safer Resin Tapping: Assessing Alternative Chemical Stimulants for Pinus pinaster

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Publicado en:Forests vol. 16, no. 5 (2025), p. 849
Autor principal: Rubio Pérez Faustino
Otros Autores: Rodríguez-García Aida, Michavila Santiago, Rodríguez, Ana, Gil, Luis, López Rosana
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100 1 |a Rubio Pérez Faustino  |u Departamento de Sistemas y Recursos Naturales, ETSI Montes, Forestal y del Medio Natural Universidad Politécnica de Madrid, 28040 Madrid, Spain; faustino.rubio.perez@upm.es (F.R.P.); ana.rdominguez@alumnos.upm.es (A.R.); luis.gil@upm.es (L.G.) 
245 1 |a Toward Safer Resin Tapping: Assessing Alternative Chemical Stimulants for <i>Pinus pinaster</i> 
260 |b MDPI AG  |c 2025 
513 |a Journal Article 
520 3 |a The use of chemical stimulants in resin tapping is essential for prolonging the resin flow and enhancing production. Traditional stimulants, primarily composed of sulfuric acid, pose concerns related to workplace safety, environmental impact, and tree health. In this study, we compared alternative stimulant pastes containing ethrel, salicylic acid, and citric acid with the traditional Spanish and Brazilian stimulant pastes with higher contents of sulfuric acid. We tapped Pinus pinaster seedlings with five different stimulants, using untreated and mechanically wounded plants as controls. The resin yield, tree growth, and physiological parameters were compared. The pines stimulated with citric acid released ca. 50% more resin, while ethrel and salicylic acid yielded similar amounts to the traditional paste, suggesting their potential as viable alternatives. Although all stimulants reduced the seedling growth, no significant differences were observed in the midday water potential or stomatal conductance. The internal resin accumulation and resin canal density were strongly correlated with the total resin production, and more-acidic pastes tended to cause xylem damage and resin retention. Our findings suggest that moderate acidity is sufficient to trigger resin biosynthesis and release, and that safer, less corrosive formulations, like citric acid, may provide viable, safer, and more sustainable alternatives to conventional stimulants. While the results from the seedlings provide a rapid and cost-effective screening tool, anatomical and physiological differences from mature trees should be considered when extrapolating findings to operational settings. 
651 4 |a Spain 
653 |a Physiology 
653 |a Sulfuric acid 
653 |a Acidity 
653 |a Biosynthesis 
653 |a Timber 
653 |a Plant structures 
653 |a Stimulants 
653 |a Salicylic acid 
653 |a Citric acid 
653 |a Pastes 
653 |a Xylem 
653 |a Environmental impact 
653 |a Water potential 
653 |a Stomatal conductance 
653 |a Pine trees 
653 |a Seedlings 
653 |a Experiments 
653 |a Resins 
653 |a Occupational safety 
653 |a Stomata 
653 |a Trees 
653 |a Pinus pinaster 
653 |a Environmental 
700 1 |a Rodríguez-García Aida  |u Department of Plant Molecular Genetics, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CNB-CSIC), 28049 Madrid, Spain; aida.rodriguez@cesefor.com 
700 1 |a Michavila Santiago  |u Fundación Cesefor, Área Forestal y Gestión de Recursos Naturales, 42005 Soria, Spain; smichavila@cnb.csic.es 
700 1 |a Rodríguez, Ana  |u Departamento de Sistemas y Recursos Naturales, ETSI Montes, Forestal y del Medio Natural Universidad Politécnica de Madrid, 28040 Madrid, Spain; faustino.rubio.perez@upm.es (F.R.P.); ana.rdominguez@alumnos.upm.es (A.R.); luis.gil@upm.es (L.G.) 
700 1 |a Gil, Luis  |u Departamento de Sistemas y Recursos Naturales, ETSI Montes, Forestal y del Medio Natural Universidad Politécnica de Madrid, 28040 Madrid, Spain; faustino.rubio.perez@upm.es (F.R.P.); ana.rdominguez@alumnos.upm.es (A.R.); luis.gil@upm.es (L.G.) 
700 1 |a López Rosana  |u Departamento de Sistemas y Recursos Naturales, ETSI Montes, Forestal y del Medio Natural Universidad Politécnica de Madrid, 28040 Madrid, Spain; faustino.rubio.perez@upm.es (F.R.P.); ana.rdominguez@alumnos.upm.es (A.R.); luis.gil@upm.es (L.G.) 
773 0 |t Forests  |g vol. 16, no. 5 (2025), p. 849 
786 0 |d ProQuest  |t Agriculture Science Database 
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