玉米根系水流导度差异及其与解剖结构的关系

应用生态学报 ›› 2005, Vol. 16 ›› Issue (12): 2349-2352.

玉米根系水流导度差异及其与解剖结构的关系

王周锋^1,2, 张岁岐¹, 刘小芳^1,2

1. 中国科学院-水利部水土保持与生态环境研究中心黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100;
2. 中国科学院研究生院, 北京 100039

收稿日期:2005-01-13 修回日期:2005-05-23 出版日期:2005-12-15 发布日期:2005-12-15
通讯作者: 张岁岐
基金资助:
国家自然科学基金项目(30571127)和中国科学院知识创新工程重要方向资助项目(KZCX3-SW-444).

Root system hydraulic conductivity of different genotype maize and its relationship with root anatomy

WANG Zhoufeng^1,2, ZHANG Suiqi¹, LIU Xiaofang^1,2

1. State Key Laboratory of Soil Erosion and Dryland Farming of the Loess Plateau, Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100;
2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China

Received:2005-01-13 Revised:2005-05-23 Online:2005-12-15 Published:2005-12-15

摘要/Abstract

摘要： 在人工气候室水培条件下,从单根水平研究了不同水分条件下玉米根系水流导度的基因型差异及解剖结构之间的关系.结果表明,抗旱性的杂交种户单四号具有水流导度上的杂种优势现象,不抗旱的父本803根系水流导度最低,3个品种根系水流导度大小为F₁代户单四号＞母本天四＞父本803;水分胁迫普遍降低了根系直径、导管直径和皮层厚度.同时,玉米品种根系的解剖结构和根系水流导度有关,正常水分条件下,根系导管直径与3个玉米品种的根系水流导度呈正相关,胁迫条件下则呈负相关.无论是在胁迫还是正常水分条件下,根系皮层厚度占根系直径的比例与根系水流导度都呈负相关,说明根系皮层是根系吸收水分的主要阻力部位.

关键词: 水分胁迫, 玉米, 水流导度, 解剖结构

Abstract: Under solution culture condition and by using pressure chamber techniques,this paper studied the difference of root system hydraulic conductivity (Lpr) of different genotype maize at the level of individual root,and its relationship with root anatomy.The results showed that the Lpr of root system was different with different genotype,and there existed heterosis in F₁ generation.Under normal culture condition,the root with wider vessels had higher Lpr and drought resistance; while under water deficit,there was a significantly negative correlation between the width of root vessel and the Lpr and drought resistance.Under both normal and deficient water supply,there was a negative correlation between the ratio of cortex to root diameter and the Lpr and drought resistance,suggesting that root cortex was the placement with the greatest resistance to the liquid water flow in plant.

Key words: Water deficit, Maize, Hydraulic conductivity, Anatomic structure

中图分类号:

Q945.79

王周锋, 张岁岐, 刘小芳. 玉米根系水流导度差异及其与解剖结构的关系[J]. 应用生态学报, 2005, 16(12): 2349-2352.

WANG Zhoufeng, ZHANG Suiqi, LIU Xiaofang. Root system hydraulic conductivity of different genotype maize and its relationship with root anatomy[J]. Chinese Journal of Applied Ecology, 2005, 16(12): 2349-2352.

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