Constituent acids of Pinus radiata stem cutin

Stem cutin from P. radiata seedlings grown under winter and summer environmental conditions comprised n-alkanoic, (C₁₀–C₂₆), α, ω-alkanedioic (C₁₄–C₂₂), ω-hydroxyalkanoic (C₁₂–C₂₄), hydroxy-α, ω-alkanedioic and polyhydroxyalkanoic acids. 9-Hydroxyheptadecane-1, 17-dioic, 9-hydroxyoctadecene-1, 18-dioic, 9-hydroxynonadecane-1, 19-dioic, and 10, 17-dihydroxyheptadecanoic acids are newly-identified constituents of gymnosperm cutin. Cutin grown under winter temperatures and photoperiod contained twice the amount of 9, 16-dihydroxyhexadecanoic acid than that in summer-grown cutin, suggesting that the winter-grown cutin was formed from a highly cross-linked polymer, and that summer-grown cutin contained more linear polyester portions in the polymer.