玉米茎秆木质部表型与其水分运输功能直接相关，建立玉米茎秆木质部参数化模型及水分运输动力学模型，对不同基因型玉米的水分利用效率评价、抗旱性筛选等具有重要意义。课题以不同抗旱性玉米品种的茎秆木质部表型检测为切入点，利用激光三维扫描仪、CT成像和显微成像技术分别获取玉米植株-茎秆-木质部各尺度上二维/三维数据，系统解析玉米茎秆木质部表型参数，揭示木质部表型与抗旱性之间关系；进而，利用面向对象技术建立玉米茎秆木质部的多尺度模型，利用简化的玉米根部水分吸收和冠层蒸腾模型构造植物与环境的水分交换界面，基于多孔介质模型实现玉米茎秆水分运输动态模拟；最后，比较不同抗旱性玉米品种之间茎秆木质部的表型差异及其水分运输效率，为基于玉米茎秆木质部表型参数的抗旱性评价提供表型检测方法和仿真工具。课题实施有助于揭示玉米水分运输机理，为玉米木质部表型检测、抗旱性品种筛选与鉴定、及农艺节水提供技术支撑。

Xylem phenotypes of maize stem are directly related with its water use efficiency, thus it is of great significance to set up multi-scale parametric xylem model of maize stem and dynamic simulation model for water transport in the evaluation of water use efficiency and varieties screening of drought resistance. With xylem phenotype detection of maize stem as the breakthrough point, multi-scale 2D and 3D datasets of maize plant – stem - xylem are obtained using 3D laser scanner, CT imaging and light microscopy imaging techniques, and used to analysis systematically the phenotypic parameters which are helpful to reveal the quantitative relationship between phenotypic parameters of xylem structures and its efficiency of water transport. Using object oriented technologies, maize multi-scale xylem model of maize stem is then built according to detected phenotypic parameters. Taking simplified maize root water absorption and canopy transpiration models as water exchange interfaces between plant and environment, dynamic model based on porous media is developed to dynamically simulate water transport in maize stem. By comparative analysis of phenotypic differences and water transport efficiency between maize varieties with drought-resistant differences, drought resistance evaluation method and software based on the xylem phenotype parameters of maize stem is proposed, and phenotype detection and water transport simulation software are provided. This project is beneficial to reveal water transport mechanism of maize, and provide technical support for xylem phenotype detection, selection and identification of drought-resistant varieties, and the measures of agronomic water saving.