2024年2月22日 星期四
中国狗牙根〔Cynodondactylon(L.)Pers.〕耐寒性及其变化规律
The low temperature tolerance variation and its laws of Cynodon dactylon ( L. ) Pers. in China
2002年 第11卷 第2期 页码[48-52]    下载全文[0.7MB]  
摘要

49 份具有代表性的我国狗牙根Cynodon dactylon ( L.) Pers.〕种源的离体叶片进行模拟低温处理, 用电导法测其电导率, 将电导率拟合 Logistic 方程, 计算出狗牙根各种源叶片的半致死温度( LT50 ) 回归分析的结果表:各种源的 LT50与其所在的经纬度呈显著的线性关系, 线性回归方程分别为 Y = -31.379 7 +0 .147 8X Y =-10 .798 2 -0 .142 0X 依据 LT50的变化, 可将这 49 份狗牙根种源分为 3 大类, 即低温敏感型( LT50 ≥-10) 过渡( -18℃<LT50 <-10) 和耐寒型( LT50≤-18 ) , 3 类狗牙根的分布具有一定的规律性对狗牙根的耐寒机理也进行了探讨
 

Abstract

Leaves of 49 accessions of Cynodon dactylon ( L.) Pers .were treated under simulate  low temperature in the freezer. Electrolyte leakage rate were measured and LT50 were calculated .The results of linear regressive analysis indicated that the LT50 vs .longitude and latitude are both proved to be notably linearly correlated .The equations are Y =-31 .379 7 +0 .147 8X and Y =-10 .798 2 -0 .142 0X . According to the LT50, three types of C .dactylon were determined, that is, low temperature sensitivity type ( LT50 ≥-10 ) , transition type ( -18 ℃<LT50 <-1 0 ) and low temperature tolerance type ( LT50 -18 ) .And regularity is found in the distribution of the three types .This paper also inquired into the mechanism of low temperature tolerance reflected by LT50 .
 

关键词狗牙根; 电导率; 半致死温度; 耐寒性;
Key wordsCynodon dactylon ( L. ) Pers.; electrolyte leakage rate; living temperature 50 ( LT50 ); low temperature tolerance
作者郑玉红, 刘建秀, 陈树元
所在单位江苏省中国科学院植物研究所, 江苏 南京 210014
点击量1031
下载次数687
基金项目国家自然科学基金资助项目( 39770534)