水培和土培虎尾兰根系结构的比较

目的]研究虎尾兰根系对水培的适应性,为水培花卉的研究提供理论依据。方法]以短叶虎尾兰为材料,制作徒手切片,采用水培与土培2种培养方式,观察并比较根系外观形态和解剖结构的变化。结果]在形态上,土培短叶虎兰根系坚硬,表面粗糙,侧根发达,而水培短叶虎尾兰根系生长速度慢,直径较小,根毛退化。从解剖结构来看,土培根的表皮由1层细胞组成,表皮细胞外覆盖较厚的植被皮,而水培根系表皮较薄,皮层细胞体积较大,髓部占中柱面积较小,木质部退化;短叶虎尾兰根中皮层部位存在含晶细胞。结论]水培虎尾兰植株的根系结构发生了不同程度的变化,但不影响其正常生长。

Comparison of the Root Structures of Sansevieria trifasciata in Hydroponic Culture and Soil Culture

Objective] To research the adaptation of Sansevieria trifasciata in hydroponic culture and soil culture, and to provide theoretical foundation for the research on hydroponic-cultured flowers. Method] With S. trifasciata as the material, freehand section was made. Observa-tion was carried out under two modes of hydroponic culture and soil culture. Changes of root appearance and anatomical structure were compared. Result] In morphology, S. trifasciata roots under hydroponics culture grew slowly with smaller diameter and degenerated root hair. However, S. trifasciata roots under soil culture had strong root with developed lateral root and rough surface. In anatomical structure, the root epidermis of S. trifasciata roots under hydroponics culture was thinner, cortical cell volume was greater;marrow accounted relatively small area in the column area;xylem degradation appeared. There were a few crystal cells in the cortex of S. trifasciata roots. Conclusion] Root structure of S. trifascia-ta under hydroponics culture changes in different degrees, which dose not affect its normal growth.