木兰科植物兼具观赏、药用、材用、生态和科研价值，文化内涵深远，适应范围广，几乎涵盖整个中国，可作为建设低碳生态园林城市的重要植物材料，但相对较差的抗逆性成为制约其园林应用推广的最大瓶颈。为发掘耐涝性种质资源，研究人员根据淹水胁迫过程中木兰科植物的表型变化，选定叶色变化、植株萎蔫情况、茎基部变化和成活率变化4个指标，将其定量分级，制定等级得分标准及评价方案，然后以各指标得分的总和对耐涝性进行综合评价，建立了木兰科植物耐涝性评价体系。研究已对31木兰科种类的2～3年生种播苗进行了耐涝性鉴定，初步筛选出3个耐涝性强的木兰科优异种质。

Magnoliaceae plants have both ornamental, medicinal,timber, ecological and scientific value. They have profound cultural connotations and a wide range of adaptations covering almost the entire China. They can be used as important plant materials for the construction of low-carbon ecological garden cities, but their relatively poor resistance to stress has become an important bottleneck restricting its garden application and promotion. This study is to explore waterlogging tolerance germplasm resources. According to the phenotypic changes of Magnoliaceae plants during the process of flooding stress, four indicators including leaf color change, plant wilting condition, stem base change and survival rate change were selected, and they were quantitatively classified. Formulate the grade score standard and evaluation plan, and then comprehensively evaluate the waterlogging tolerance based on the sum of the scores of each index, and establish the waterlogging tolerance evaluation system of Magnoliaceae plants. In this study, 2-3 year-old seedlings of 31 magnolia species have been identified for waterlogging tolerance, and 3 excellent magnolia germplasms with strong waterlogging tolerance have been initially screened.

S688

2021陕西省创新能力支撑计划项目——木兰科资源保护和种质创新团队（编号2021TD-33）