四合木根部及茎部导管分子比较解剖学研究  

Comparative Anatomy of Root and Stem Vessel Elements of Tetraena mongolica

作　　者：兰庆 刘果厚[1] 刘冠志[1] 李红颖[1] 

机构地区：[1]内蒙古农业大学草原与资源环境学院,呼和浩特010011

出　　处：《西北植物学报》2016年第11期2220-2225,共6页Acta Botanica Boreali-Occidentalia Sinica

基　　金：内蒙古自治区应用技术研究与开发资金计划(20131902)

摘　　要：采用显微照相技术对四合木根、茎部导管分子形态特征及数量特征进行比较研究,并运用SMA分析导管分子长度与直径之间的异速生长关系,探讨四合木的次生木质部导管分子对草原化荒漠地区的适应特性。结果表明:(1)四合木根部与茎部导管分子均以孔纹、网纹和两端无尾类型为主,具单穿孔板。(2)四合木根部与茎部导管分子在长度上均为短级水平,直径上均为小级水平,且宽窄导管并存;茎部导管分子较根部导管分子更加"小型化"。(3)不论根部或茎部,其导管分子的长度与直径之间均表现出异速生长的关系,且导管分子长度的增长速率大于直径的增长速率。这些结果有助于从细胞学尺度上了解荒漠区木本植物对草原化荒漠地区的适应策略。The study used photomicrographic technique to compare the morphological characteristics and quantity characteristics between the root and stem vessel elements of Tetraena mongolica, and used the SMA to analyze the allometric relation between the length and diameter of vessel elements, in order to discuss the adaptability of secondary xylem elements of T. mongolica to the grassland desertification area. The results showed that： （1） the root and stem vessel elements of T. mongolica are mainly pitted and reticulate catheter types, and both have no tail, and both of them have simple perforation plate; （2） the root and stem vessel elements of T. mongolica which catheter length are short grade level, and their catheter diameter are small short level and both have wide and narrow vessel elements, and stem vessel elements are more “miniaturization” than that of roots; （3） regardless of the roots or stems, their length and diameter of the catheter molecules exhibit allometric relationship, and the growth rate of vessel length is greater than that of diameter. These results are helpful to understand the adaptation strategies from catheter scale in desert area of steppe desert region.

关 键 词：四合木 导管分子 异速生长 荒漠植被 

分 类 号：Q944.5[生物学—植物学]