Purpose To investigate the dwarfing efficacy of nano-growth regulators on eucalyptus and their physiological impacts, providing a novel approach for developing enhanced growth regulators and optimizing vegetation management strategies near high-voltage power lines.
Methods Pot experiments were conducted on 1-year-old eucalyptus saplings. Ten treatments were applied via foliar spraying, including four conventional growth regulators (paclobutrazol, uniconazole, chlormequat chloride, mepiquat chloride), two nano-capsule suspensions (paclobutrazol and uniconazole), and four film-forming nano-capsule suspensions (paclobutrazol/uniconazole film-forming, chlormequat/mepiquat chloride sustained release nano emulsions), with a water-sprayed control (CK). This design evaluated the nano-formulations’ dwarfing efficacy and physiological impacts.
Results All ten growth regulator treatments inhibited height growth compared to CK. Although they temporarily impacted leaf physiology, including SPAD values, photosynthetic rates, antioxidant enzyme activities, malondialdehyde levels, and endogenous hormones, these parameters gradually recovered to CK levels over time without causing irreversible damage to the survival rate and physiology of the eucalyptus. After nano-modification, the dwarfing efficacy of conventional growth regulators was significantly enhanced. Among the treatments, paclobutrazol and uniconazole film-forming nano-capsule suspensions demonstrated optimal performance, reducing height growth by 90.02% and 93.54%, respectively, compared to CK.
Conclusion The dwarfing efficacy of conventional growth regulators is significantly improved after nano-modification, and the paclobutrazol and uniconazole film-forming nano-capsule suspensions represent optimal formulations. This technology can effectively inhibit eucalyptus apical growth. Combined with drone spraying technology, it is expected to provide an efficient solution for tree-power line conflicts near high-voltage power lines.
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