优良暖季型观赏草抗寒性研究  

A study on low temperature tolerance of warm-season ornamental grasses

作　　者：宗俊勤[1] 高鹤[1] 郭爱桂[1] 刘建秀[1] 

机构地区：[1]江苏省中国科学院植物研究所南京中山植物园,江苏南京210014

出　　处：《草业科学》2011年第11期1915-1918,共4页Pratacultural Science

基　　金：江苏特色观赏植物(草坪草;观赏草和石蒜等)资源收集开发业务建设(BM2009905)

摘　　要：为了解暖季型观赏草材料的抗寒性,以暖季型观赏草的叶片为试验材料,用改良电导法配合Logistic方程求拐点温度的方法测定了8份暖季型观赏草材料的半致死温度(LT50),结合供试材料物候期的观测,对材料的抗寒性进行分析和评价。结果表明,经过等梯度的低温(10、5、0、-5、-10、-15、-20和-25℃)处理后,供试材料叶片细胞伤害率和温度之间呈现明显的S形曲线,符合Logistic方程,拟合度较好。8份材料的抗寒性强弱顺序依次是紫田根(Saccharum arundinaceum)>甜茅(S.ravennae)>劲芒(Miscanthus sinensis‘Strictus’)>矮蒲苇(Cortaderia selloana)>歌舞芒(M.sinensis‘Cabaret’)>遍生芒(M.sinensis‘Cosmopolitan’)>狼尾草(Pennise-tum alopecuroides)>柳枝稷(Panicum virgatum)。而LT50与物候期的相关分析表明,抗寒性与青绿期之间没有显著相关性,表明青绿期和抗寒性是可以同时得到改良的。In order to understand low temperature tolerance of warm-season ornamental grasses, eight germplasm materials were used to investigate their phenological period in Nanjing, and LTs0. The LT50 was determined by the inflectional point temperature through conductance ratio measurement combining with Logistic equation. The results showed that low temperature tolerance of the materials was ranked as follows ： Saccharurn arundinaceum〉S. ravennae Miscanthus sinensis ＇ Strictus〉Cortaderia selloana ＇ Pumila 〉Miscanthus sinensis ＇ Cabaret〉M. sinensis Cosmopolitan 〉 Pennisetum〉Panicum virgatum ＇Rehbraun＇There was no significant correlation between LT50 and green period. Both the low temperature tolerance and the green period extension can be enhanced simultaneously.

关 键 词：暖季型观赏草 物候期 抗寒性 半致死温度 

分 类 号：S688.4[农业科学—观赏园艺]