暖季型草坪草不同营养器官耐寒力的动态变化  

The dynamic changes of cold tolerance in different vegetative organs of three warm season turf grasses during the overwintering

作　　者：王丹[1] 宣继萍[1] 郭海林[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》2010年第3期26-30,共5页Pratacultural Science

摘　　要：于2008年10月-2009年5月,应用改良电导法测定模拟低温处理下3种暖季型草坪草(兰引3号结缕草Zoysia japonica Lanyin No.3、阳江狗牙根Cynodon dactylon Yangjiang、假俭草E126Eremochloaophiuroides E126)的叶片、地上茎和地下茎电解质渗透率的变化,并拟合Logistic方程求冰冻半致死温度(LT50),比较分析3种暖季型草坪草LT50季节性动态变化以及不同营养器官间的抗寒性差异。结果表明,随着田间气温季节变化,3种暖季型草坪草的叶片、地上茎和地下茎的LT50呈现出先降低后升高的趋势,且兰引3号结缕草地下茎、阳江狗牙根地下茎、假俭草E126地上茎表现出较强的耐低温能力。通过LT50的动态变化分析并结合田间物候期观测,发现兰引3号结缕草抗寒性最强,假俭草E126次之,阳江狗牙根最差。From October 2008 to May 2009, changes of electrolyte leakage rate in leaves, stems and rhizomes of three warm season turf grasses （Zoysia japonica Lanyin No. 3, Cynodon dactylon Yangjiang and Eremochloa ophiuroides E126）, which in simulated cold treatment were determined with improved conductivity method, and the freezing lethal temperature of 50 % （LT50） was estimated by the means of fitting Logistic equation, as well as the seasonal dynamic changes and differences of cold tolerance among different organs were analyzed, comparatively. The results indicated that LT50 in leaves, stem and rhizomes of three warm season turf grasses showed decreased firstly then increased sharply with seasonal changes in field temperature which was dropped in overwintering and increased in spring. The rhizomes of Z. japonica Lanyin No. 3, the rhizomes of C. dactylon Yangiiang and stems of E. ophiuroides E126 showed better cold tolerance . In summary, Z. japonica Lanyin No. 3 had the greatest cold tolerance, E. ophiuroides E126 was second, and C. dactylon Yangjiang had poor cold tolerance by analyzing the dynamic seasonal changes of LT50 and observing the phenophase in field.

关 键 词：暖季型草坪草 抗寒性 电解质渗透率 半致死温度(LT50) 动态变化 

分 类 号：S688.4[农业科学—观赏园艺]