1.More anthraquinone compounds was distributed in pithray cells and the tissues of mature stem suchas bundle sheaths in large-scale vascular bundle, primary phloem and primary xylem than that in young stem. [Conclusion] The distribution of anthraquinone compounds in the stem was of multilocus.
2.The varieties that have less cell-layers of cork-layer,looser tissuesof ligneous tissue,bigger total area or vessel,bigger rate between pith areaand ligneous area,smaller rate between total ray area and ligneous area areeasy to produce died branches.
