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比较研究了鹅掌楸属(Liriodendron)中国鹅掌楸、北美鹅掌楸和杂交鹅掌楸3个树种次生木质部的显微构造。经方差分析,3个树种间导管分子、木纤维、轴向薄壁组织和木射线组织等解剖特征存在极显著差异,杂交鹅掌楸次生木质部结构兼具亲本特征。首次发现中国鹅掌楸中存在单穿孔导管,约占4%。中国鹅掌楸较北美鹅掌楸导管分子短、导管端壁穿孔板横隔数少、弦切面木射线组织的宽度、高度小以及轴向薄壁细胞束的细胞个数少。北美鹅掌楸与中国鹅掌楸相比具有更多的原始特征,中国鹅掌楸较北美鹅掌楸进化。
The microstructure of the secondary xylem of Liriodendron, Liriodendron, Liriodendron and Liriodendron hybrids was comparatively studied. By means of analysis of variance, the anatomical characteristics of the three tree species, such as the catheter molecule, the wood fiber, the axial parenchyma and the wood ray tissue were significantly different. The secondary xylem structure of the hybrid tulip tree had the characteristics of both parents. For the first time, there was a single perforation catheter in Chinese tulip tree, accounting for about 4%. Liriodendron chinense is shorter than that of Liriodendron chinense. The number of transversal perforated plates in the catheter is less, the width and height of the chordal tissue are smaller, and the number of cells in the axial parenchyma is less. Liriodendron chinense has more primitive features than Liriodendron chinense, and Liriodendron chinensis evolved more than Liriodendron chinense.