《植物生理学报》 2013, 49(3): 297-300

一种简易准确测定木质部导水率的新方法

王明浩, 张晓玮, 王婧如, 赵长明*

兰州大学生命科学学院, 草地农业生态系统国家重点实验室, 兰州730000

通信作者：赵长明；E-mail: zhaochm@lzu.edu.cn；Tel: 0931-8914305

摘　要：

木质部导水率作为植物水力结构特征的重要指标, 被广泛应用于植物水分运输等相关研究, 而目前对于测定木质部导水率的仪器存在着价格昂贵、操作复杂等缺点, 在普通实验条件下难以推广。因此, 根据冲洗法原理设计了一种简易准确测定木质部导水率的新方法, 并利用该方法分别测定了垂柳(Salix babylonica)、胡杨(Populus euphratica)、榆叶梅(Amygdalus triloba)和紫丁香(Syringaoblata)四种木本植物的木质部导水率和边材比导率, 结果显示该方法简便可行、数据可靠, 值得在植物水分生理教学实验和科学研究中推广应用。

关键词：木质部; 导水率; 比导率; 水分运输

收稿：2012-11-30   修定：2013-01-10

资助：兰州大学2012年度实验技术创新基金(2012-06)和国家自然科学基金(31170571)。

A Simple and Accurate Method for Measuring Hydraulic Conductivity in Xylem

WANG Ming-Hao, ZHANG Xiao-Wei, WANG Jing-Ru, ZHAO Chang-Ming*

State Key Laboratory of Grassland Agro-Ecosystems, School of Life Sciences, Lanzhou University, Lanzhou 730000, China

Corresponding author: ZHAO Chang-Ming; E-mail: zhaochm@lzu.edu.cn; Tel: 0931-8914305

Abstract:

Xylem hydraulic conductivity as an important index of plant hydraulic architectures, which has been widely used in plant water transport and other related research, however, the current instruments for determina-tion of xylem hydraulic conductivity are difficult to promotion in ordinary experimental conditions, because these instruments are expensive or complex operation and so on faults. Here, a simple and accurate method to determine xylem hydraulic conductivity was designed, and then the xylem hydraulic conductivity of four woody species (Salix babylonica, Populus euphratica, Amygdalus triloba and Syringa oblata) were measured. The results showed that these data were reliable and this method was convenient and feasible. Taken together, this method is worth promoting in plant water physiological experiment teaching and scientific research.

Key words: xylem; hydraulic conductivity; specific conductivity; water transport