Analysis of Leaf Anatomical Structure and Drought Resistance of 17 Grape Rootstock Varieties

【Objective】 To explore the relationship between leaf anatomical structure indexes and drought resistance of grape rootstocks, and to provide a convenient and effective method for screening grape varieties with drought resistance. 【Methods】 The perennial field vines of 17 grape rootstock varieties were treated with drought stress（21d）, the relative moisture content and electrical conductivity of stem and leaf were measured, and the anatomical structure characteristics of the leaves were observed and compared, and the drought resistance of grape rootstock varieties was evaluated by principal component analysis and cluster analysis. 【Result】 The results show that, the relative water content of leaves of 17 grape rootstock varieties decreased greatly under drought stress, while the relative water content of stem nodes showed two trends of small increase and decrease, and the relative electrical conductivity of leaves and stem nodes showed different degrees of increase. And the order of sensitivity of leaf anatomical structure indexes to drought stress was:R/S> CTR> SR> TUE> TL> TLE> TP> TS. 【Conclusion】 The index of leaf anatomical structure is closely related to the drought resistance of grape rootstocks and can be used to identify their drought resistance. Combined with principal component analysis and cluster analysis comprehensive evaluation obtain, 1103P, 5BB and Riparia9 have highly drought resistant, 3309C, Riparia2, Riparia10 and Amurensis×Riparia4 have strong drought resistance, 1613C, Dogridge, Beta and Amurensis×Riparia1 have moderate drought resistance, Amurensis×Riparia3, Riparia7, Riparia Glorie, 101-14MG and Riparia4 have weak drought resistance, Ganzia has the weakest drought resistance.