Statistical Analysis
Data were then analyzed on SAS by performing a one-way analysis of variance (ANOVA) with rootstock as the main factor for shoot length, trunk cross sectional area, net carbon assimilation, stomatal conductance, transpiration rate and midday stem water potential. Before the data analysis, interaction among years and rootstocks were evaluated using SAS 9.4 PROC GLM software (SAS Campus Drive Cary, NC, USA). Mean separation tests were performed with Tukey’s test with 95% confidence of significance. Linear regression was used to explore the relationships between variables and figures were prepared using OriginPro 2021 Data Analysis and Graphing Software (OriginLab Corporation, MA, USA).