Response of Tracheid Structure Characteristics and Lignin Distribution of Taxodium Hybrid Zhongshanshan to External Stress

The Taxodium hybrid Zhongshanshan fast-growing species is susceptible to environment and gravity form reaction wood. In this study, individual growth rings of wood are used as subjects, an ring divided into three zones: compression zone (CZ), lateral (LZ), opposite (OZ). microanatomical structure chemical properties the tracheids in CZ, LZ, OZ forms by inclined or bent T. comparatively analyzed using optical microscopy, scanning electron microscope, laser confocal Raman imaging techniques. length diameter (CW) decreased, shape cross-sections became rounded compared LZ tracheids. More notably, threaded fissures appeared on cell wall tracheids, thickness increased CW. analysis tracheids’ showed that CW had a complete outer secondary middle (S2L) layer, but no inner (S3) layer. transition (TA) between normal early wood, were compressed Despite having similar morphology they thin S2L Tracheids layer only at angle cell. No was seen CZ late It can be concluded response lignin deposition location external stress faster than change morphology. above results help provide theoretical basis for mechanism anatomical structures has important value understanding its characteristics rational efficient usage.