东北刺人参茎次生木质部结构植物学研究

摘要

Oplopanax elatus is a plant belonging to Araliaceae. The anatomic study of the secondary xylem in Oplopanax elatus stems were conducted and its results showed that it was a ring-porous wood and its rays were heterogeneous Ⅱ ones. There were two types of vessel perforation plates, simple perforation one and scalariform plant. There were 8 types of vessels according to different perforation plates. Vascular trachied, fibretracheid and libriform wood fibres were also found. There were vessels with only one simple perforation plate at their center, vessels with two perforation plates, simple perforation one and scalariform perforation one, at their center, vessels with scalariform perforation plate at one end and pitted thickening at the other end, vessels with simple perforation plate at one end and pitted thickening at the other end, vessels with scalarifiorm perforation plates at their two ends, vessels with three perforation plates on their side wall, and vessels with two simple perforation plates at their two ends. The evolution of Oplopanax elatus vessel perforation in ontogeny recapitulated the process in phylogeny.%东北刺人参为五加科植物[1],本文对其茎次生木质部进行结构植物学研究,发现其为环孔材,射线为异形Ⅱ型.在离析材料中,发现其导管分子穿孔板有单穿孔板和梯状穿孔板2种.具不同穿孔板的导管分子可分为8种,还有维管管胞、纤维管胞和韧型木纤维.8种导管分子是只有中央具1个单穿孔的导管;中央有2个穿孔的导管,其中一个孔是单穿孔,另一个是梯状穿孔;一端是梯状穿孔板,另一端为孔纹增厚的导管;一端是单穿孔,另一端是孔纹增厚的导管;一端为单穿孔板,另一端为梯状穿孔板的导管;两端都是梯状穿孔板的导管;侧壁具有3个穿孔的导管;两端都具单穿孔的导管.在东北刺人参的个体发育中重演了系统发育过程中导管分子穿孔板的演化过程.