通过对广西分布和部分引种栽培和苏铁植物根、茎、叶维管组织的解剖研究，弄清各类群种类输导组织管状分子的结构特征：主要在已发现少数种类有导管的前提下，探明其它种类是否也有导管存在，分布的位置及其结构特征。这对于裸子植物的解部学、系统与进化研究及生态适应要制研究，指导苏铁类植物的野外保护及人工繁育工程等具有重要意义。

The 28 species of Cycas debaoensis, Stangeria eriopus and Macrozamia moorei etc.in 3 families of Cycadopsida were carried out anatomical studies on vascular tissue, the roots ,stems and leaves of these materials were made histological section by paraffin method and freeze method ,light microscopy observation and the dissociated materials of every organ for light microscopy and scanning electron microscopy observation research.The major achievements as the follows: 1.Descovered vessel in family Stageriaceae.Since we have discovered vessels in Cycadaceae and Zamiaceae in former times,so we have discavered vessel in all families of Cycadopsida. 2.The root,stem and leaf of all species possess vessel,indicate that cycads possessing vessel is a universality. 3.All species possess plentiful types of vessels. 4.The evolutionary extent of structure of most of the vessels are quite high. Because widely thought that primitive cycads only possess primitive tracheids and no vessels in former times, and in respect of the ability which transport water and nutrition, vessel is about 10 times than tracheid both in terms of amount and rate,so above research reveal important a secrets which why cycads can still survival and procreation to now after undergo every geological period in over 2 hundred millioms, and to understand their

本探究对苏铁纲3个科的德保苏铁、托叶铁、摩瑞大泽米等28个苏铁种类进行了维管组织的解剖学研究，其中对其根、茎、叶进行石蜡切片和冰冻切片观察研究；对各器官材料进行组织离析，光学显微镜和扫描电子显微镜观察研究。主要研究成果为：1.在托叶铁科植物中发现了导管。由于此前本项目组已经在另2个科的代表种中发现了导管，因此，至此就已经在苏铁纲所有3个科中全部发现了导管。2.在所研究的所有种类的根、茎、叶材料中全部发现了导管，即存在导管具普遍性。3.各种类中的导管均具丰富的类型。4.大多数导管结构进化程度很高。由于以往认为原始的苏铁类植物仅有原始的管胞而没有导管，而导管比管胞输送水分和营养物质的能力要强约10倍，因此上述结果揭示了为何起源古老的苏铁类植物能经历2亿多年的各种恶劣的严酷环境，仍能顽强生存和繁衍至今在适应机制和抗逆性方面的一个重要奥秘。5.发现苏铁类植物根系为须根系。而过去均认为苏铁类植物为直根系。6.同一条根从根尖处往上维管束数目逐渐增加。7.叶柄和叶轴内有栅栏组织和海面组织。8.各种类在根、茎、叶结构上均各具特点，差异较大。这些对于植物解剖学和苏铁类植物生物学研究及保护等均具重要意义。