玉米根系水流导度差异的生理形态原因分析

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含量和低质膜透忡有关。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。

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

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 F_1 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 F_1. Meantime, the analysis also revealed that the morphologies of the root systems exerted influence on their hydraulic conductivities.