J Integr Plant Biol. ›› 1987, Vol. 29 ›› Issue (2): -.

• Research Articles •    

Anatomical Studies on Hypocotyl of Circaeaster

Li Zheng-li (Lee Cheng-lee) and Dong Zhong-min   

Abstract: The stem of Circaeaster agrestis Maxim. is very short but the length of hypocotyl is comparatively long, almost occupying the whole length of the plant. This tender hypocotyl is mainly supported by the thickening of cuticle on the outer wall of the epidermal cell and the primary xylem in the center. Between primary xylem and primary phloem there are 2–3 layers of parenchymatous cells, regularly or irregularly arranged, but no cambial zone can be recognized. The transition region where root and stem meet showed no evidence of twisting, splitting or inversion of the strands in the primary vascular tissues which are common in most of the dicots. The extending cotyledon traces differentiate directly from the parenchymatous cells which locate on the outside of the poles of primary xylem. The first and the second leaf traces are organized in the middle of the primary phloem.

Key words: Circaeaster agrestis, Hypocotyl, Transition zone

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