不同越冬低温对当归春化抽薹的影响

摘要

当归(Angelica sinensis(Oliv.)Diels)是具有重要药用价值的作物,生产中早薹是限制其产量的重要因素,而春化是引起早薹的根本原因.在冬贮期对当归苗分别进行-5、0和5℃持续及各温度间的定期转换处理,次年栽植至产区大田以分析不同低温冬储对当归春化早薹的影响.结果表明0℃持续处理早薹率最高,而-5℃处理早薹率最低;-5℃初始短时处理可以促进当归的早薹,而栽前的5℃处理可加快当归芽的发育和生长;在适宜温度下,当归的早薹率与处理日数呈正相关.因此,-5℃持续冬储可抑制当归苗的春化而减少早薹,当归春化是与处理日数相关的连续性事件,这项研究对当归苗冬储和栽培具有参考作用.%Angelica sinensis (Oliv.) Diels is a valuable herbal plant. In production, its premature bolting, caused by vernalization, seriously affects its root yield. In this stuty, thermal treatments of 5, 0 and -5°C, as well as treatments with shifts between these temperatures, were performed in its overwintering storage to investigate the chilling effect on the early bolting of Angelica sinensis and analyze the vernalization response to different temperatures. The results indicated that the 0°C treatment rendered the highest bolting rate, and the -5°C resulted in the lowest bolting rate. The initial short-term treatment at -5°C could promote the early bolting of A. sinensis, and the treatment at 5°C prior to planting could hasten its seedling bud growth. At the appropriate temperature, the early bolting rate of Angelica was positively related to the number of treatment days. So the frozen storage at -5°C could inhibit the vernalization of Angelica seedlings and the early bolting. The vernalization of Angelica could be a continuous process related to the number of treatment days. This study would serve as reference for the overwintering storage and cultivation of Angelica.