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玉米根系水流导度差异及其与解剖结构的关系
引用本文: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.
作者姓名:王周锋  张岁岐  刘小芳
作者单位: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
基金项目:国家自然科学基金项目(30571127),中国科学院知识创新工程重要方向资助项目(KZCX3-SW-444).
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  
文章编号:1001-9332(2005)12-2349-04
收稿时间:2005-01-13
修稿时间:2005-05-23

Root system hydraulic conductivity of different genotype maize and its relationship with root anatomy
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.
Authors:WANG Zhoufeng  ZHANG Suiqi  LIU Xiaofang
Institution: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
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 F_1 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.
Keywords:Water deficit  Maize  Hydraulic conductivity  Anatomic structure  
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