暹罗苏铁茎的解剖学研究  

Study on Anatomical Structure of the Stem of Cycas siamensis

作　　者：韦丽君[1,2] 黄玉源[3,4] 陈金湘[1] 伍映辉[5] 黄爱花[6] 

机构地区：[1]湖南农业大学农学院,长沙410128 [2]广西壮族自治区亚热带作物研究所,南宁530001 [3]仲恺农业工程学院生命科学学院,广州510225 [4]广西大学农学院,南宁530005 [5]海口市农业科学研究所,海口570011 [6]广西农业科学院玉米研究所,广西明阳530007

出　　处：《西北植物学报》2011年第11期2210-2215,共6页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金(30260007)

摘　　要：利用冰冻切片法在光学显微镜下观察暹罗苏铁茎的解剖特征。结果表明,暹罗苏铁茎由周皮、皮层、皮层维管束、中柱和髓组成,皮层和髓发达。皮层维管束可分为周韧型和外韧型两种,以周韧型为主。中柱的次生结构为同心环的次生维管组织构成,随着茎的不断成熟,环数逐渐增加;每个同心环均含有次生木质部、维管形成层、次生韧皮部的结构;环与环之间有次生的薄壁组织相间隔。皮层、中柱维管束均由木质部、形成层和韧皮部组成,木质部面积均大于韧皮部。苏铁植物茎在次生结构方面的主要特点是有皮层维管束和同心环结构的中柱维管束。We observed anatomy characteristics of stems of Cycas siamensis by freeze-sectioning under the optical microscope.The results indicated that the stem of C.siamensis was composed of periderm,cortex,cortex vascular bundle,stele and pith.Cortex and pith were well developed.The types of cortex vascular bundle could be two kinds：amphicribral bundles and collateral bundles,the former was major.The secondary structure of stele was composed of secondary vascular tissue with some concentric rings.As the stem matured,the numbers of rings were gradually increased.Every ring contained secondary xylem,vascular cambium and secondary phloem;secondary parenchyma cells between the two rings.All vascular bundles in cortex or in stele were composed of xylem,cambium and phloem.The area of xylem was greater than that of phloem.The main characteristics of secondary structure of stems of Cycas plants were,both cortex vascular bundle and stele vascular tissue with same concentric rings.

关 键 词：暹罗苏铁 茎 结构特征 生态适应性 

分 类 号：Q944.55[生物学—植物学]