The Selection Of Wood-decay Resistance Of Scots Pine Heartwood And The Correlation Between The Phenolics And The Resistance

In this study, wood destroy fungi Coniophora puteana was used to rot Scots Pine heartwoods from two trials of progeny test. The aim was to select the decay resistant and susceptible population and family for the species. On the basis of this, the relationship between concentrations of stilbenes in the samples and the heartwood resistant ability was studied. Accordingly, the concentrations of stilbenes can be used to select the decay resistant wood (structure wood) and the decay susceptible wood (pulp wood).1. The result showed that the density losses of the samples from the two trials were different along with the different rot time of the heartwood. Furthermore, the differences between families and individuals were also significant in the wood density losses. This result could provide useful information for selection of decay resistant and susceptible colonies.2. 10 decay resistant trees and 10 susceptible trees were respectively selected to do the chemical analysis. The mean density loss of the selected decay resistant population was 6.9mg/cm3 (trial 1) and 5 mg/cm3 (trial 2), and that of the selected decay susceptible population was 231 mg/cm3 (trial 1) and 169 mg/cm3 (trial 2).3. By mean of Folin-Ciocalteu technoque, using acetone as standard, total phenol content in the samples was measured. The result showed that the difference between the decay resistant and susceptible population was statistically significant in both trials.4. In the chemical analysis, three kinds of stilbenes were found in the samples by using GLC-MS (HP 6890). They were Pinosylvin (PS), pinosylvin monomethyl ether (PSM) and pinosylvin dimethyl ether (PSD). PSD was only found in part of the samples where was low in concentration. The mean concentration of total stilbenes in decay resistant population was 7.43mg/g(trial 1) and 5.10mg/g(trial 2);And that in decay susceptible population was 6.30mg/g (trial 1) and 4.77mg/g (trial 2). The variation of total stilbenes content between two populations was also significant. The results implied that stilbenes concentration in the samples might affect to the wood-decay tolerance, but it was not the only reason to explain the variation in wood-decay among the samples. Furthermore, a high concentration of phenolics was connected to the low hygroscopicity of the wood.