关键词: 桃, 砧木, 耐涝性, 光合生理指标, 主成分分析, 综合评价

Abstract: The effective evaluation of waterlogging tolerance of different peach rootstock cultivars is necessary for the proper choice of suitable cultivars in production areas usually have waterlogging phenomenon. The experiment was conducted at peach experimental orchard of Jiangsu Academy of Agricultural Sciences with one-year-old seedlings of 10 peach rootstock cultivars. The photosynthetic indexes were measured for evaluating the waterlogging tolerance. It was found that the change range of each index was inconsistent in different cultivars. Based on the changes of the photosynthetic indexes in response to submergence stress，the eight single indexes could be classified into two independent comprehensive components through principal component analysis. Based on subordinate functional analysis the ten peach rootstock cultivars were divided into three groups，namely high，medium and poor waterlogging tolerance cultivar group. GF43 and GF1869 belonged to high waterlogging-tolerance type； Maotao，Maotao 2，Tsukuba 5，Taobadan，Shaanxi Taobadan，Nemaguard and GF305 belonged to medium waterlogging-tolerance type；Shantao belonged to poor waterlogging-tolerance type.

Key words: peach, rootstock, waterlogging tolerance, photosynthetic index, principal component analysis, comprehensive evaluation