The author studied the effects of different concentrations of DNA methylation inhibitor 5-azaC on the growth and developmental indexes of cauliflower with various maturities in the field. The results showed that a certain concentration(10~20 mg/L)of 5-azaC could not only promote the budding and flowering of cauliflower,but also affect the other growth indexes such as plant height,plant width,ball-flower diameter and single-ball-flower mass,and the effect degree was closely related to the con-centration of 5-azaC. For the same cauliflower material,there was a significant difference in budding date among different concen-trations of 5-azaC treatments,and the budding date of cauliflower in 5-azaC treatments was 3~8 days earlier than that in the con-trol. The appropriate 5-azaC concentration for cauliflower was 10~20 mg/L. The sensitivity of different cauliflower materials to 5-azaC treatment was different, and low concentration(5~20 mg/L)of 5-azaC treatment promoted the budding and flowering, while high concentration(20~40 mg/L)of 5-azaC treatment inhibited the growth and development of cauliflower.%研究了不同浓度DNA甲基化抑制剂5-氮杂胞苷(5-azaC)处理不同熟性花椰菜(青花和白花)的幼苗对现蕾时间等田间生长发育指标的影响.结果表明:一定浓度的5-azaC不仅能促进花椰菜提前现蕾和开花,而且对株高、株幅、花球直径、单球质量等生长指标均有影响,影响大小与浓度密切相关.同一材料在不同浓度5-azaC条件下花椰菜现蕾时间存在显著差异,各处理的现蕾时间均比对照明显提前,现蕾时间可提前3~8 d,适宜的5-azaC浓度为10~20 mg/L.不同材料对5-azaC处理的敏感反应程度不同,低浓度5-azaC(5~20 mg/L)处理表现为促进作用,高浓度5-azaC(20~40 mg/L)处理表现为抑制作用.
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