图6. 竹节中存在“类板状结构” (PLS)。A, B, 茎秆中番红溶液流入幼嫩竹箨。B为A矩形框的纵切徒手切片, 可见番红溶液在竹节处转向竹箨。C, 在竹节部观察到类板状结构(PLS)存在。D, 竹节纵切的连续石蜡切片的组合图, 可见PLS及纵向导管。E, 竹节的横切图, PLS在不同方向存在, 贯穿竹节。F, G, C中①和②处的石蜡切片横切图, 可见PLS中存在大量的导管(V)和韧皮部(P)。图中箭头a和c分别指示箨环(竹箨在竹节的着生处)和秆环(竹节与节间的分隔处), 虚线(不成框)表示竹节位置; 箭头b示节间的纵向导管, d为竹隔。

Fig. 6. A “plate-like structure” (PLS) in the bamboo node. A, B, the safranine solution in the culm flowed into the young bamboo sheath. B was the free-hand longitudinal section of the rectangular frame in A, in which the safranine solution was found turnning into the culm sheath at the node. C, a PLS was showed. D, a serial longitudinal paraffin section of bamboo node, showing the presence of PLS and longitudinal vessel. E, the free-hand transverse section of the node, in which PLS existed in different directions and running through the node. F, G, transverse paraffin sections at ① and ② in C, respectively, there were a large number of vessels (V) and phloem (P) in the PLS. Arrows a and c in A-D pointed the sheath ring (the joint between the culm sheath and the node) and the rod ring (the joint between the bamboo node and the node), respectively. The dashed line (no box) in A-D show the bamboo node; arrow b shows the longitudinal vessels of internodes, and d is the bamboo septum.