Brassinolide effectively stabilizes yield and improves quality in citrus fruit retention and prevention by regulating nutrient distribution.
As a plant growth regulator, Brassinolide itself does not provide nutrients, but it significantly optimizes the balance of endogenous hormones within the tree, promotes the translocation of photosynthetic products to the fruit, and enhances the absorption efficiency of mineral nutrients. Therefore, it plays a crucial role in fruit retention, stabilization, and quality improvement at multiple critical stages.
The core mechanism of Brassinolide in citrus fruit retention and prevention:
1. Regulating nutrient distribution and promoting nutrient translocation to the fruit. During the physiological fruit drop period and the young fruit enlargement period, nutrient competition within the citrus tree is intense, with new shoots competing with young fruit for nutrients. 1. Brassinolide regulates the nutrient supply structure of the tree, guiding photosynthetic products and mineral nutrients (such as calcium, magnesium, and potassium) to preferentially transport to developing fruits, reducing fruit drop due to insufficient nutrition, ensuring young fruits receive sufficient nutrients, and achieving fruit stabilization and expansion.
2. Enhances stress resistance and reduces fruit drop caused by environmental stress. Citrus trees often encounter adverse conditions such as drought, high temperatures, rain, and late spring frosts during their flowering and fruiting periods. Brassinolide can activate the activity of protective enzymes in plants, reduce cell membrane permeability, and reduce reactive oxygen species damage, thereby enhancing the tree's drought resistance, cold resistance, and waterlogging resistance. Spraying under adverse conditions can effectively reduce fruit drop and stabilize yield.
3. Synergistically enhances foliar fertilizer efficiency. Brassinolide can improve the absorption and utilization efficiency of nutrients by leaves. It is often used in combination with foliar fertilizers such as calcium, magnesium, boron, and potassium dihydrogen phosphate. This not only promotes fruit cell wall development (preventing fruit cracking and peel puffiness) but also accelerates sugar accumulation, improves fruit peel color and taste, and achieves the dual goals of "stable yield" and "improved quality.”
