Physiological and Biochemical Traits of Grafted Seedlings of Catalpa bungei with Various Combinations of Rootstocks and Scions

【Objective】This study aims to compare and analyze the differences in physiological indicators among different combinations of rootstocks and scions of Catalpa bungei, so as to provide a reference basis for the selection of rootstock and scion combinations and the evaluation of their affinity and growth status.【Method】The grafting was carried out with Catalpa bungei'Nanlin No.1', Catalpa bungei 'Luoqiu' and Catalpa bungei 'Suqiu No.1' as scions, and Catalpa ovata and Catalpa fargesii as rootstocks, and the survival rate, osmoregulatory substance content, antioxidant enzyme activity, endogenous hormone content of each grafting combination were determined. Correlation analysis was conducted on various physiological indicators, and the principal component analysis and orthogonal partial least squares discriminant analysis were used to comprehensively evaluate each grafting combination.【Result】1) The survival rate of the C. fargesii/C. bungei 'Nanlin No.1' combination was the greatest among the six rootstock and s