The Dynamic Changes in Cold Tolerance of Ground-cover Chrysanthemum Growing in the Open Field during the Overwintering  

地被菊露地越冬期间耐寒力的动态变化（英文）

作　　者：景雄[1,2] 白永霞[1,2] 沈漫[1,2] 冷平生[3] 

机构地区：[1]北京农学院植物科学技术学院,北京102206 [2]北京市农业应用新技术重点实验室,北京102206 [3]北京农学院园林学院,北京102206

出　　处：《Agricultural Science & Technology》2015年第11期2399-2405,2436,共8页农业科学与技术（英文版）

基　　金：Supported by the Key Project under Beijing Municipal Education Commission(KM20150020021);the Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges under Beijing Municipal Education Commission(IDHT20150503)~~

摘　　要：The ground-cover chrysanthemum （Dendranthemaxgrandiflorum Kitamura） ＇Zixunzhang＇ was used as the experimental material in this study. The physiological and biochemical indexes of leaves, emergent rhizomes and roots from ＇Zixunzhang＇ growing in the open field during the autumn and winter in Beijing area were deter- mined. These indexes showed that root activities decreased slowly with the drop in temperature. The relative water contents of leaves and emergent rhizomes, and the water content of roots decreased. The activities of SOD, CAT and POD from leaves and emergent rhizomes were affected significantly by low temperature, but their change trends were different, which suggested that these 3 enzymes might play an interacted role in the formation of the cold tolerance of ＇Zixunzhang＇ mum, while the changes of the three enzyme activities in roots were little when the tem- perature dropped. With the significant increasing of the content of soluble sugar from leaves, the contents of soluble protein and proline declined overall; and the contents of osmotic regulation substances of emergent rhizomes and roots increased at first and then decreased. The correlation analysis indicated that the cold toler- ance of ground-cover mum ＇Zixunzhang＇ was related closely to relative water con- tents, SOD enzyme activity, soluble protein, soluble sugar and root activity. The morphological observation of leaves, emergent rhizomes and roots also showed that the survival of the ground-cover mum mainly depended on the cold tolerance of roots during the overwintering.以露地栽培的地被菊(Dendranthema×grandiflorum Kitamura)‘紫勋章'品种为植物试材,对其秋冬季期间的叶片、脚芽、根进行测定分析,并对备生理指标间的相关性进行分析。结果表明,露地越冬期间,地被菊‘紫勋章'根系活力随温度缓慢下降:叶片和脚芽的相对含水量及根的含水量随温度降低而下降;叶片和脚芽的SOD、CAT、POD酶活性受降温影响较明显,变化趋势不同,推测这3种酶可能在‘紫勋章'耐寒力形成中交替发挥作用,而根的酶活性则受低温影响较小。随着温度的降低,‘紫勋章'叶片可溶性糖含量显著增加,可溶性蛋白和脯氨酸含量总体呈下降趋势:脚芽和根的渗透调节物质含量总体呈升降趋势。相关性分析表明,地被菊‘紫勋章'耐寒力与相对含水量、SOD、可溶性蛋白、可溶性糖、根系活力密切相关。叶片、脚芽和根系的形态观测结果也表明,地被菊越冬成活与否主要取决于根系耐寒力的强弱。

关 键 词：Ground-cover chrysanthemum OVERWINTERING Cold tolerance 

分 类 号：S682.11[农业科学—观赏园艺]