The Brief Report on First Discovery of Vessel in Cycads
Huang Yuyuan 1 Zhang Hongda(Chang Hungta) 2 (1 Agric. College,Guangxi Univ.,Nanning 530005;
The specimens of pinna of Zamia furfuracea were isolated in nitric acidchrome acid solution and were observed under omnipotence microscope and electron microscope.It was discovered that there were vessels in the xylem. The vessels possessed 6 types. The annular vessel and spiral vessel were longer and the diameter less; the scalariform , pitted vessel etc. were shorter, but the diameter bigger,while the diameter of reticulated vessel were largest.The end walls were more acclivitous or level shape,some were attached with tail.There were simple perforation plate in annular and spiral vessel,while compound perforation plate in scalariform , reticulated and pitted vessel.This was also the first dicovery of vessel in Cycads.This discovery have very important significance in botanical field.