Regulatory Effects of Combined Application of Exogenous IAA and 6-BA on Sprout Development and Endogenous Hormone Balance in Pinus yunnanensis Seedlings After Stumping
This study demonstrates that the combined application of exogenous IAA and 6-BA regulates sprout development in stumped *Pinus yunnanensis* seedlings by modulating the endogenous hormone balance network, specifically by optimizing the GA₃/ZA ratio to control sprout number and the synergistic accumulation of IAA and GA₃ to influence sprout length, thereby providing a theoretical basis for efficient clonal propagation.