Effects of Root Cutting on Morphological Characteristics and Endogenous Hormone Levels of Quercus variabilis Seedlings

The objective of this study was to investigate the effects root cutting stress on dynamic changes endogenous hormone content and growth characteristics Quercus variabilis roots, explore physiological role hormones in regulating root-crown interactions short term. morphological contents normal roots (no cutting, CK) cut (cut by 1/3 length main root, RP) were determined liquid chromatography, which combined with mass spectrometry at different levels developmental stages. results showed that indexes RP group superior those CK group. Through comprehensive analysis hormones, it found crosstalk IAA, JA, ABA SA could activate defense. After treatment, seedlings compensate for inhibition taproot promoting lateral growth. development compensatory contribute increase total plants, thus absorption water nutrients. It is speculated plant may be key factors affecting their development, but not only related a single hormone, more importantly, interaction between various hormones.