Differences in the Growth of Seedlings and the Selection of Fast-Growing Species in the Gleditsia Genus

The Gleditsia genus has various uses, including those for medicinal, edible, chemical, timber, and ornamental purposes, the is widely distributed in China. However, there still a lack of understanding about phenotypic growth differences seen among species within genus. In this study, we compared analyzed seedlings terms their genotypes, chromosome numbers, physiological growth, photosynthesis, hormone content, gene expression. results showed that genome size ranges from 686.08 M to 1034.24 all are diploid. Among studied, G. fera can be divided into fast-growing genotype, exhibited several advantages leaf type photosynthetic capacity, high levels GA3, fast stem making it with potential promotion application. delavayi auxin cytokinin strong rapid plant height. microphylla had lowest IAA, IBA, NAA apical, slow Weighted correlation network analysis (WGCNA) identified hub genes associated traits. This study lays material theoretical foundation development new resources breeding rootstock selection provides basis mechanism rootstock–scion interaction.