玉米根系水流导度差异的生理形态原因分析  

Analysis of the Physiological and Morphological Factors Leading to the Hydraulic-conductivity Difference among the Root Systems of Maize

作　　者：王周锋[1] 张岁岐[1] 刘小芳[1] 

机构地区：[1]中国科学院水利部水土保持与生态环境研究中心

出　　处：《西北植物学报》2005年第8期1607-1611,共5页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家重点基础研究专项(G1999011708);国家自然科学基金项目(30170559)

摘　　要：在人工气候室水培条件下,研究了水分胁迫对不同基因型玉米杂交种及其亲本根系水流导度(Lpr)变化的影响,并从生理和形态角度对其差异进行了分析.结果表明:表型抗旱的杂交种F1代(户单四号)整株根系水流导度最高,具有根系水流导度上的杂种优势现象.对其差异的生理和形态因素分析表明,F1代水流导度高与其高脯氨酸含量、低MDA含量和低质膜透性有关.同时表明,根系的形态特征对根系的水流导度也存在一定的影响.Different genotypes of corn hybrids with their parents were hydroponically cultured to study the effects of water stress on the hydraulic conductivity of their root systems and the hydraulic-conductivity difference of the root systems were analyzed from physiological and morphological angles. The results showed that the drought resistant F1 hybrid （Hudan 4） had a higher hydraulic conductivity in its root system thus displaying heterosis in root hydraulic conductivity. The analysis of the physiological and morphological factors leading to the hydraulic-conductivity differences demonstrated that the high hydraulic conductivity related to the high proline content, low MDA content and low plasmalemma permeability in F1. Meantime, the analysis also revealed that the morphologies of the root systems exerted influence on theirhydraulic conductivities.

关 键 词：水分胁迫 玉米 水流导度 

分 类 号：Q945.45[生物学—植物学] S513[农业科学—作物学]