Micronutrients participate in various plant metabolic pathways, including the synthesis of carbohydrates, lignin, and phenols, which are necessary for plant growth and defense against pests and pathogens. In this study, we evaluated the effects of nutrient solutions deplete in B, Cu, or Zn on the nutrition, growth, and production of biochemical compounds in Eucalyptus urophylla cuttings. The experiment was carried out in a greenhouse for 90 days, with clonal cuttings of E. urophylla at four months of age. The treatments evaluated were complete fertilization (CF) and individual omissions of B, Cu, and Zn in the nutrient solution. The omission of Cu and Zn increased the concentration of carbohydrates in the leaves by 10% and reduced the rate of CO₂ assimilation (A) by more than 30%. Cu omission decreased the lignification process compared to complete fertilization. Flavonoid production in plants with complete fertilization was 45–75% higher than that in plants maintained under B, Cu, or Zn deficiencies. Collectively, these results suggest that micronutrient deficiencies may reduce plant productivity as well as plant resistance to pests and pathogens.

微量营养素参与各种植物代谢途径，包括碳水化合物、木质素和酚类的合成，这些是植物生长和抵御害虫和病原体所必需的。在本研究中，我们评估了缺乏 B、Cu 或 Zn 的营养液对尾叶桉插条中生化化合物的营养、生长和生产的影响。该实验在温室中进行了 90 天，在 4 个月大时使用了E. urophylla 的克隆插条。评估的处理是完全施肥 (CF) 和营养液中 B、Cu 和 Zn 的个别遗漏。Cu和Zn的省略使叶子中碳水化合物的浓度增加了10%，并降低了CO ₂的速率同化 ( A ) 超过 30%。与完全施肥相比，Cu 遗漏减少了木质化过程。完全受精植物的黄酮类化合物产量比缺乏 B、Cu 或 Zn 的植物高 45-75%。总的来说，这些结果表明微量营养素缺乏可能会降低植物生产力以及植物对害虫和病原体的抵抗力。