摘要
对垂盆草Sedum sarmentosum对低温的生理响应进行了研究.结果表明,垂盆草的叶片经模拟低温4、0、-4、-8、-12、-16、-20℃处理2 h,叶片的电解质渗透率和丙二醛含量增加;随温度的降低,叶片的过氧化物酶活性快速升高、游离脯氨酸大量累积、可溶性糖含量急剧增加;采用电解质渗透法,测定了垂盆草的半致死温度(LT50)为-8.64℃.即垂盆草具有较强的抗寒性,能通过一系列保护性的生理生化反应来适应低温胁迫,以减轻低温伤害.
Physiological response of a landscape engineering grass Sedum sarmentosum to chilling stress were studied.The leaves of Sedum sarmentosum were treated under 7 simulated chilling stress gradients（4,0,-4,-8,-12,-16,-20 ℃）.The results showed that both the electrolytic leakage rate and malondialdehyde（MDA） content in leaves increased slowly when leaves are exposed to low temperature for 2 h.Meanwhile,the activity of peroxidase（POD）,the content of free proline and soluble sugar significantly increased as the temperature dropped down.By the method of the electrolyte infiltration,the lethal temperature（LT50） of Sedum sarmentosum was obtained on the basis of conductivity and Logistic equation to be-8.64 ℃.This study indicated that the Sedum sarmentosum was of high cold resistance,and was able to adapt to low temperature stress through a series of physiological and biochemical reaction.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2007年第4期65-68,共4页
Journal of South China Agricultural University
基金
湖北省科技攻关项目(2002AA3001C99)
湖北省教育厅重大科研项目(2002Z0007)
湖北省涝渍灾害与湿地农业重点实验室开放基金(HNKFJ2002C03)
湖北省教育厅优秀中青年科技创新团队资助项目(鄂教科[2003年7号]文-12)
国家教育部新世纪优秀人才支持计划(2005-2007)
关键词
工程绿化
垂盆草
抗寒生理
半致死温度(LT50)
landscape engineering
Sedum sarmentosum
cold resistant physiology
lethal temperature（LT50）
