菊花8个品种的低温半致死温度及其抗寒适应性  

The LT_(50) and Cold Tolerance Adaptability of Chrysanthemum During a Natural Drop in Temperature

作　　者：许瑛[1] 陈发棣[1] 

机构地区：[1]南京农业大学园艺学院,南京210095

出　　处：《园艺学报》2008年第4期559-564,共6页Acta Horticulturae Sinica

基　　金：国家自然科学基金项目(30400308);上海市农委重点攻关项目[沪农科攻字(2006)第4-3号]

摘　　要：通过测定秋冬季自然降温过程中菊花脚芽的叶片相对电导率（REC），结合Logistic方程计算的半致死温度（LT50），评价了不同花期8个菊花品种在不同降温时期的抗寒性，并通过生长恢复试验进行验证。结果表明，在自然降温过程中，8个菊花品种的低温半致死温度均随气温的下降而不断降低，但下降幅度因品种而异，4．0—9．4℃不等。8个品种抗寒性由强到弱排序依次为‘金陵黄鹤’〉‘银星’〉‘奥运晚霞’〉‘金陵之光’〉‘奥运锦云’〉‘03（6）-16’〉‘03（6）-12’〉‘奥运火炬’，植株抗寒性与花期相关性不显著。11月底菊花脚芽恢复生长试验与当月半致死温度测定结果基本一致，表明半致死温度可作为菊花抗寒性评价的一个可靠指标。当温度降到-14℃时，供试品种的脚芽均不能恢复生长。The relative electric conductivity （REC） was determined in the leaf of emergent rhizomes of chrysanthemum during the natural drop in temperature from autumn to winter. The logistic equation was constructed based on the relationship between REC and temperature, then the semi-lethal temperature was determined. The cold tolerance of 8 cultivars was evaluated by LT50. The validity of LT50 in evaluating the cold tolerance of chrysanthemum was proved by recovery of emergent rhizome test. The results showed that the LT50 ＇03 （6） -12＇ and ＇Aoyun Huoju＇. No significant correlation between cold tolerance and florescence was observed. Emergent rhizomes recovering test was overall in consistence with the result of the freezing test indicating that LT50 temperature was a credible indicator to evaluate the cold tolerance of chrysanthemum. No emergent rhizomes recovered when the lethal low temperature was below -14℃.

关 键 词：菊花 抗寒性 半致死温度 相对电导率 

分 类 号：S682.1[农业科学—观赏园艺]