Secondary vascular tissue, found only in plants with secondary thickening, develops from the vascular cambium. 次生维管组织由维管形成层发育而来，仅存在于有次生加厚的植物中。
Plant celltotipotent is the theoretical basis for plant tissue cultrue producing secondary metabolite and transforming gene plant producing alloprotein. 植物细胞全能性是植物组织培养生产次生代谢产物及转基因植物生产异源蛋白质的理论基础。
