中国沙漠 ›› 2006, Vol. 26 ›› Issue (2): 254-258.

• 研究论文 • 上一篇    下一篇


侯艳伟1,2, 王迎春2, 杨 持2, 征 荣2   

  1. 1.华侨大学 材料科学与工程学院, 福建 泉州 362021; 2.内蒙古大学 生命科学学院, 内蒙古 呼和浩特 010021
  • 收稿日期:2004-10-25 修回日期:2005-01-20 出版日期:2006-03-20 发布日期:2006-03-20

Morphogenesis and Anatomy of Fissurate Growth of Potaninia Mongolica

HOU Yan-wei 1,2 , WANG Ying-chun 1, YANG Chi 1, ZHENG Rong2   

  1. 1.College of Materials Science and Engineering, Huaqiao University, Quanzhou 362021, Fujiang, China; 2.College of Life Sciences , Neimonggol University, Hohhot 010021, China
  • Received:2004-10-25 Revised:2005-01-20 Online:2006-03-20 Published:2006-03-20

摘要: 对绵刺劈裂生长的形态发生及内部解剖结构特征进行了观察,研究结果如下:①绵刺的劈裂生长有两种类型,一种是首先茎从基部到根部发生多次劈裂,以后地上的茎部再相应发生分裂而形成几个独立的植株;另一种是茎基部以上的部位先发生纵裂,而根部后发生分离;②劈裂生长首先在茎基部发生,当绵刺植株生长到5 a以上的时候,这个部位的形成层活动不均匀,出现不规则的木质部排列,形成花环状结构,在相邻的两环状部位进行劈裂;③由于受劈裂生长的影响,劈裂发生后的植株的根部年轮分布不规则,发生劈裂部位的形成层活动不均匀,形成的次生木质部中导管数量少,口径也小,木纤维数量增多,细胞排列紧密而形成缢缩。

关键词: 劈裂生长, 形态发生, 解剖结构, 绵刺

Abstract: Many xerophilous plants have such a vegetative reproduction, fissurate growth. Some super xerophilous plants such as Potaninia mongolica, Reaumuria soongorica, Reaumuria trigyna, Salsola passerina, Caragana stenophylla, etc. in Erdos region of Inner Mongolia have this characteristic. Potaninia mongolica is a typical fissurate growth species here. It is the archaic single species genus plant and belongs to Rosaceae. It can adapt to drought environment well. Potaninia mongolica has breeding system with sexual and vegetative reproduction, and the latter is the main type, which has two modes: one is that the branches drop and grow new vegetal body, the other is fissurate growth. Many xerophilous plants in Erdos region of Inner Mongolia share the same characteristic, fissurate growth, which is a special adaptive strategy for them to adapt to the droughty environment. But the correlated study on fissurate growth is few, and it is the first report that the study on morphogenesis and anatomy of fissurate growth of Potaninia mongolica.In this study, we selected typical fissurate growth species, Potaninia mongolica that living in west Erdos region of Inner Mongolia, to study the morphogenesis and anatomy of fissurate growth. We gathered the root and stem of unfissurate body and fissurated body, dealt with them with FAA, and observed and made a picture after making sections. The results are as follows: (1) Fissurate growth of Potaninia mongolica had two types: one is root firstly split, and then above-ground stem split later, and every fissurate part formed single body, but the other was opposite. (2) Fissurate growth started from the base of stem. During certain phases of growth, the cambium layer of this part was asymmetric, the arrangement of xylem was anomalistic, and formed the wreathlike structure. And then the adjoining constrictions started to split. (3) As the influence of fissurate growth, the annual ring of the root of fissurated body was irregular. The cambium layer of the fissurate part was asymmetric, the vessel of secondary xylem became less and smaller, while the amount of xylem fiber increased. The cells became tighter and the constriction formed.

Key words: Fissurate growth, morphogenesis, anatomy, Potaninia mongolica