【摘要】 目的:研究川续断主根的生长发育的规律及结构的变化;寻找区别野生及栽培川续断、鉴别川续断不同栽培年限的依据。方法:对栽培川续断1、2年生主根及野生川续断不抽苔、抽苔植株的主根连续分段取样,切片观察;栽培川续断1～4年生主根分别切片观察。结果:首次发现川续断主根结构中存在生长轮的结构,并发现野生与栽培川续断生长轮导管排列方式不同,野生品为切向排列而栽培品为团状排列;野生品根上部有髓部,栽培品未见髓部,可以作为初步区别野生与栽培川续断的方法。每一主根从上到下生长轮结构一致,根的增粗主要取决于第1年木质部增长。栽培川续断1～4年生主根结构与年限之间有一定的关系和规律,可以作为初步鉴别生长年限的依据。结论:建立了野生川续断和不同栽培年限川续断的组织结构鉴别方法,为续断药材鉴别提供依据。更多还原

【Abstract】 Objective:To study the regular pattern of growing development and the structural changes of the main root of Dipsacus asper;Find the basis for distinguishing between wild and cultivated Dipsacus asper as well as identifying cultivated Dipsacus asper at different growth years.Methods:Continuous sectional sampling and histological observation was conducted on the main roots of annual and biennial cultivated Dipsacus asper and on the main roots of bolting and non-bolting plants of wild Dipsacus asper;Histological observation was carried out respectively on the main roots of one to four-year-old cultivated Dipsacus asper.Results:It was discovered for the first time that there was structure of growth rings in the main roots of Dipsacus asper.And the ways in which the vessels of the growth rings were arranged differed between wild and cultivated Dipsacus asper,the vessels of growth rings in wild Dipsacus asper were arranged tangentially while those in cultivated Dipsacus asper were arranged as clusters.Pith existed in the upper part of roots of wild Dipsacus asper,while it was not found in the cultivated ones,and this could be adopted as a preliminary method to distinguish the wild Dipsacus asper from cultivatedone.The structures of growth rings in each main root were in consistency from top to bottom,and the thickening of roots mainly depended on the growth of xylem in the first year.There were particular relations and regular patterns between the structure of main roots of one to four-year-old cultivated Dipsacus asper and the ages of their growth,which could serve as the primary basis for identifying their growth years.Conclusion:Methods to distinguish wild Dipsacus asper from cultivated ones at different ages by organization structure are established,which could provide the basis for identification of the medicinal material of Dipsacus asper.更多还原