不同产脂量马尾松无性系木质部树脂道结构差异  

Structural Differences of Xylem Resin Canals among Pinus massoniana Clones with Different Resin Yield

作　　者：魏永成[1] 刘青华[1] 周志春[1] 丰忠平[2] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,富阳311400 [2]浙江省淳安县姥山林场,淳安311700

出　　处：《林业科学》2016年第7期38-45,共8页Scientia Silvae Sinicae

基　　金："十二五"国家科技支撑课题(2012BAD01B02);国家自然科学基金项目(31100491);浙江省竹木农业新品种选育重大科技专项项目重点课题(2012C12908-12)

摘　　要：【目的】研究不同产脂量马尾松无性系嫩枝、未创伤与创伤树干木质部树脂道结构的差异,为高产脂量无性系的早期选择提供理论依据。【方法】以6个不同产脂量马尾松无性系为材料,采用石蜡切片技术,研究和比较其嫩茎、树干木质部树脂道结构和创伤后树脂道结构的差异性,并分析嫩茎、创伤与未创伤树脂道结构的相关性。【结果】在当年生嫩茎中,高、低产脂量马尾松无性系之间单位面积内树脂道总面积、单个树脂道平均面积差异显著,高产脂量无性系单位面积内轴向树脂道总面积和单个轴向树脂道平均面积分别为63 433μm^2·mm^(-2)和4832μm^2,为低产脂量的2.69和3.03倍,同时高产脂量无性系单位面积内径向树脂道总面积和单个径向树脂道平均面积分别为42 105μm^2·mm^(-2)和3 858μm^2,为低产脂量的3.19和3.44倍,但高、低产脂量无性系单位面积树脂道数目差异不显著;未受创伤树干木质部中,高、低产脂量马尾松无性系之间的差异性与嫩茎中的相似,高产脂量无性系单位面积内轴向树脂道总面积和单个轴向树脂道平均面积分别为96 229μm^2·mm^(-2)和17 656μm^2,比低产脂量的高12.15%和14.54%,同时高、低产脂量无性系单位面积树脂道数目差异也不显著;受到创伤树干木质部中,高产脂量无性系的单位面积内树脂道总面积和单位面积内树脂道数目分别为118 635μm^2·mm^(-2)和7.8个,比低产脂量的分别高23.96%和27.87%,而创伤后高、低产脂量无性系之间单个树脂道平均面积差异不显著。未受到创伤时,树脂道主要集中于晚材或早晚材过渡区域中,高产脂量无性系晚材宽度平均值为312μm,比低产脂量的高15.56%。受创伤影响,早材中出现诱导型树脂道,使木质部中单位面积内树脂道总面积和数目均增加,但高产脂量无性系中增幅比低产脂量的高,使高产脂量无性系在受到损伤时能够分泌并�【Objective】Structural difference of resin canal in young stem,un-wounded and wounded trunks among Pinus massoniana clones with different resin yield were studied in order to provide theoretical basis for early selection of high resin yielding clones.【Method】Six clones of P. massoniana with different resin yield were measured using plant paraffin sections to compare differences of xylem anatomy between young stem and trunk and to investigate the structural changes due to wounding to the trunk. And correlations of resin canal structure among young stem,wounded and un-wounded trunks were analyzed. 【Result】The total area of axial canals per unit area and the average area of individual axial canals in young stems were significantly different between high and low yielding clones. The total area of axial canals per unit area and the average area of individual axial canals of high yielding clone were 63 433 μm^2·mm^-2and 4 832 μm2,2. 69 and 3. 03 times greater than the low yielding one. The total area of radial canals per unit area and the average area ofindividual radial canals of high yielding clones were 42 105μm^2·mm^-2and 3 858 μm^2,3. 19 and 3. 44 times greater than the low yielding one. However,the difference of frequencies of axial canals was not significant between high and low yielding clones. Similar difference was found in un-wounded trunks. The total area of axial canals per unit area and the average area of individual axial canals of high yielding clone were 96 229 μm^2·mm^-2and 17 656 μm^2,12. 15% and14. 54% more than the low yielding one. And the difference of frequency of axial canals was not significant between high and low yielding clones. In the wounded xylem,the total area and number of axial canals per unit area（ 118 635 μm^2·mm^-2and 7. 9） of high yielding clone were 23. 96% and 27. 87% higher than those of the low yielding one. However,the difference of the average area of individual axial canals was not significant between the high and low yielding clones. In the un-wou

关 键 词：马尾松 产脂量 无性系 木质部 树脂道 创伤 解剖 

分 类 号：S718.4[农业科学—林学]