Resin production in wood tissues is a regular feature of pine wood species, including southern pine. High resin contents of southern pine wood may increase wood resistance against decay fungi. The current study investigated the effect of resin contents in southern pine wood on decay resistance by exposing non-extracted heartwood, mixed wood (sapwood + heartwood), and sapwood blocks with varying resin content to brown rot, Fomitopsis ostreiformis in a laboratory decay test. Matching blocks of each wood type were successively extracted in a Soxhlet using three solvents to determine resin content and were exposed to decay fungus in parallel. Results showed that mass losses in non-extracted heartwood and mixed wood depended on resin content levels, and very shallow or no mass losses were observed in blocks containing more than 31 % resin content. Sapwood experienced high mass losses, but the presence of resinous extractives significantly increased the decay resistance. All solvent-extracted blocks experienced high mass loss (53–55 %). Scanning electron microscopy showed that penetration of brown rot hyphae and cell damage depended on the resin contents of blocks. Most of the identified compounds through GC-MS belonged to oleoresins, among which monoterpene hydrocarbons, oxygenated monoterpenoids, and sesquiterpenes were more abundant in heartwood than sapwood.

中文翻译：

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含有不同量树脂的南方松木对 Fomitopsis ostreiformis (Berk.) T. Hatt 的抗腐性。

木材组织中产生树脂是松木树种（包括南方松）的一个常见特征。南方松木的高树脂含量可能会增加木材对腐烂真菌的抵抗力。目前的研究通过将未提取的心材、混合材（边材+心材）和具有不同树脂含量的边材块暴露于褐腐病中，研究了南方松木材中树脂含量对耐腐性的影响，鸵鸟在实验室腐烂测试中。使用三种溶剂在索氏提取器中连续提取每种木材类型的匹配块以确定树脂含量，并平行暴露于腐烂真菌。结果表明，未提取的心材和混合木材的质量损失取决于树脂含量水平，并且在树脂含量超过 31% 的木块中观察到非常浅的质量损失或没有质量损失。边材经历了大量的质量损失，但树脂提取物的存在显着提高了耐腐性。所有溶剂提取的块都经历了严重的质量损失（53-55%）。扫描电镜显示，褐腐菌菌丝的渗透和细胞损伤取决于块体的树脂含量。通过GC-MS鉴定的大多数化合物属于油树脂，其中单萜烃、含氧单萜和倍半萜在心材中比边材中含量更高。