Resin canal features are associated with significant economic losses to appearance grade Pinus radiata timber. This study investigated the variation in resin canal features in young, 2-year-old, P. radiata. Axial resin canal size, density and relative cross-sectional area were determined in twenty families and ten clones from images of microtomed sections, scanned with polarised light to highlight resin canals. Axial resin canal size was generally homogenous with a mean value estimate of 0.02 mm², and a coefficient of variation of ~ 10%. Estimated mean values for axial resin canal density and relative area were more variable (coefficients of variation ~ 30%) and lower for clones (0.69 canals/mm² and 1.13%, respectively) than for families (0.90 canals/mm² and 1.53%, respectively). Narrow-sense heritability (h²) estimates of the studied axial resin canal features in radiata pine at age 2-years-old were ~ 0.30. Modulus of elasticity and longitudinal shrinkage were moderately correlated with axial resin canal density and relative area, while basic density and volumetric shrinkage were independent of axial resin canal features. The study indicated that there could be potential for breeding P. radiata for resin canal features, with the aim to improve the grade yields of appearance grade products.

树脂渠道的特征与外观等级的辐射松木材造成重大的经济损失。这项研究调查了2岁的年轻放射线虫的树脂管特征的变化。轴向树脂管的大小，密度和相对截面积由切片切片的图像确定，分为二十个家族和十个克隆，用偏振光扫描以突出显示树脂管。轴向树脂管的尺寸通常是均匀的，平均值估计为0.02 mm ²，变异系数为〜10％。轴向树脂管密度和相对面积的估计平均值变化更大（变异系数〜30％），而克隆的平均值更低（0.69条运河/ mm ²和分别为1.13％和0.93条/ mm ²和1.53％。²岁时辐射松的轴向树脂管特征的狭义遗传力（h ²）估计为〜0.30。弹性模量和纵向收缩率与轴向树脂管密度和相对面积呈适度相关，而基本密度和体积收缩率与轴向树脂管特征无关。研究表明，为了提高外观品位产品的等级产量，有可能为树脂沟渠特征繁殖辐射假单胞菌。