Abstract:

In order to analyze the phenotypic difference between fasciated stems and normal stems in Salix psammophila， phenotypic comparison and statistical analysis were carried out on the changes of external morphology and anatomical structure of the annual and biennial fasciated stem of S. psammophila. It was found that the fascinated stem was obviously flat， and the top of the stem showed spikelike twisted downward. The pith of the fasciated stem was oblate， and wood rays were radially distributed without the pith as the origin， and some wood rays tend to be parallel. And the number of vascular bundles， xylem thickness， phloem thickness， and the number of vessel all increased significantly， but the diameter of vessel did not. This fasciated phenotype continued to appear after cutting propagation. This study showed that fascinated stems of S. psammophila are significantly different from the wild-type S. psammophila， and cutting propagation can maintain the stable inheritance of this fascinated trait. The research on fasciated phenotype provides a research basis for analyzing the formation cause and mechanism.

Key words: Salix psammophila, fasciation, phenotype, anatomical structure