Enhancing Resilience 14-hydroxylated Brassinosteroid 92%TC CASNo.457603 - 63 - 3 For chilli and melon.

14-hydroxylated brassinosteroids (14-OH BRs), as a significant class of plant steroidal hormones, have extensive applications in agricultural production, plant physiological research, and biotechnology. Their core value lies in regulating plant growth and development as well as stress responses, thereby enhancing plant productivity and adaptability.

①In agricultural production, 14-OH BRs are often used as plant growth regulators, acting on crops through methods such as foliar spraying and soil application. For instance, when applied during the growth period of food crops like rice and wheat, they can promote cell elongation and division, increase plant height, leaf area, and the number of effective tillers, thereby improving grain yield. For fruit and vegetable crops (such as tomatoes and cucumbers), they can accelerate fruit enlargement, promote ripening, improve fruit color and flavor, and extend the shelf life. In addition, 14-OH BRs can enhance crop resistance to abiotic stresses (such as drought, low temperature, and salinity). By regulating the plant's antioxidant system, the synthesis of osmotic adjustment substances, and gene expression, they reduce the damage to cell membranes and photosynthetic systems caused by stress, ensuring the growth and survival of crops in harsh environments.

②In the field of plant physiological research, 14-OH BRs are important tools for analyzing the mechanisms of plant hormone signal transduction.

Researchers explore their synergistic or antagonistic effects with other hormones such as auxins and gibberellins by exogenously applying them or using gene editing techniques to regulate their synthesis and metabolism, revealing their molecular mechanisms in plant physiological processes such as photomorphogenesis, vascular development, and flowering regulation. Meanwhile, studies on key genes in the 14-OH BRs synthesis pathway also provide targets for improving crop traits (such as stress resistance and yield) through genetic engineering.

③In biotechnological applications, 14-OH BRs can be used in synergy with other biological agents (such as microbial fertilizers and plant growth promoters) to improve the absorption and utilization efficiency of nutrients by crops, reduce the application of chemical pesticides and fertilizers, and contribute to the development of green agriculture. Moreover, their application in tissue culture can promote the differentiation and regeneration of explants, improving the efficiency of plant rapid propagation, which is particularly suitable for the propagation of rare seedlings or cash crops.

In conclusion, 14-hydroxylated brassinosteroids, with their multiple regulatory effects on plant growth and development, have shown important application value in agricultural yield increase, stress resistance, quality improvement, and basic research. With the deepening of research, their application scenarios will be further expanded.

The application of 14-hydroxylated brassinosteroids (14-OH BRs) spans multiple fields, with specific methods and scenarios tailored to their functional characteristics. Here are the key aspects of their application:

1.Agricultural Production: As Plant Growth Regulators

Application Methods:

①Foliar Spraying: The most common approach. Diluted 14-OH BR solutions are sprayed directly onto plant leaves, allowing rapid absorption through stomata and epidermal cells. This method is efficient for regulating growth stages (e.g., seedling establishment, flowering, and fruit development) and is widely used for crops like rice, wheat, tomatoes, and cucumbers.

②.Soil Drenching: Applied to the root zone via irrigation or soil injection, enabling absorption through root systems. It is particularly effective for enhancing root development and improving nutrient uptake, suitable for crops with well-developed root systems such as corn and soybeans.

③Seed Treatment: Seeds are soaked in 14-OH BR solutions before sowing to promote germination, increase seedling vigor, and enhance resistance to early-stage stresses (e.g., low-temperature germination barriers in rice).

Targeted Applications:

①Yield Improvement: For grain crops, spraying during the tillering or booting stage promotes tiller formation and grain filling, increasing thousand-grain weight. For fruits and vegetables, application during the fruiting period accelerates fruit enlargement and uniform ripening.

②Stress Resistance Enhancement: Applied before or during abiotic stress (drought, salinity, frost), it activates the plant's antioxidant system (e.g., increasing SOD and POD activity) and regulates osmotic substances (e.g., proline), reducing stress-induced damage.

2. Plant Physiology Research

①Mechanistic Exploration: Used as a research tool to study hormone crosstalk. For example, exogenous application of 14-OH BRs combined with auxins or gibberellins helps clarify their synergistic roles in cell elongation and vascular bundle development.

②Gene Function Validation: By regulating 14-OH BR synthesis or signaling genes (e.g., via knockout or overexpression) and comparing phenotypic changes with exogenous 14-OH BR treatment, researchers can confirm the gene's role in growth and stress responses.

3. Biotechnology and Green Agriculture

①Synergistic Use with Biological Agents: Combined with microbial fertilizers or bio-stimulants, 14-OH BRs enhance the efficiency of beneficial microorganisms (e.g., rhizobia in legumes) in nutrient conversion, reducing reliance on chemical fertilizers.

②Tissue Culture Optimization: Added to culture media to promote differentiation of explants (e.g., stem segments, calli) and improve regeneration rates, which is crucial for rapid propagation of rare plants or transgenic crop breeding.

4. Key Considerations in Application

①Dosage Control: Excessive use may cause abnormal growth (e.g., excessive elongation leading to lodging), so precise concentration adjustment based on crop type and growth stage is essential.

②Environmental Adaptability: Application efficacy is affected by temperature and humidity.

When using 14-hydroxylated brassinosteroids (14-OH BRs), several critical matters need attention to ensure their effectiveness, avoid adverse effects, and maximize their application value. Here are the key considerations:

1. Dosage and Concentration Control

①Avoid excessive use: 14-OH BRs are highly active even at low concentrations. Excessive application may cause abnormal plant growth, such as excessive stem elongation (leading to lodging in crops like rice and wheat), deformed leaves, or premature senescence.

②Crop-specific adjustment: Different crops and varieties have varying sensitivities to 14-OH BRs. For example, leafy vegetables (e.g., cabbage) may require lower concentrations than fruit crops (e.g., grapes). It is essential to refer to recommended dosages for specific crops and conduct small-scale pre-tests before large-scale application.

2. Timing of Application

①Align with growth stages: The effectiveness of 14-OH BRs is closely related to the plant's growth period. For instance, applying them during the seedling stage can promote root development and enhance stress resistance; spraying during the flowering or fruiting stage can improve pollination, fruit setting, and yield. Applying at inappropriate stages (e.g., late maturity) may have limited or even negative effects.

②Avoid extreme weather: Do not apply during extreme temperatures (high heat or freezing), heavy rain, or strong winds. High temperatures may accelerate the degradation of 14-OH BRs or cause leaf burn due to rapid evaporation, while rain can wash away the solution, reducing efficacy. Opt for calm, mild weather (e.g., early morning or late afternoon).

3. Compatibility with Other Substances

①Mixing cautiously: 14-OH BRs can often be mixed with common fertilizers, insecticides, or fungicides, but compatibility tests are necessary first. Avoid mixing with strongly acidic or alkaline substances (as 14-OH BRs are sensitive to pH extremes), which may cause decomposition or reduce activity.

②Sequence of application: If combining with other agrochemicals, apply 14-OH BRs separately or in a specific order to prevent chemical reactions. For example, applying herbicides immediately after 14-OH BRs may interfere with their regulatory effects on plant growth.

4. Storage and Handling

①Proper storage conditions: Store 14-OH BR formulations in a cool, dry, and dark place, away from direct sunlight and high temperatures, to prevent degradation. Keep them out of reach of children and pets, and separate from food, feed, or other chemicals.

②Shelf-life awareness: Check the expiration date before use. Expired products may lose activity or undergo chemical changes, leading to unpredictable effects on plants.

5. Environmental and Safety Considerations

①Minimize environmental impact: Avoid over-spraying to prevent runoff into soil or water bodies, which may affect non-target organisms (e.g., aquatic plants or microorganisms). Use appropriate application equipment to ensure precise targeting.

②Protective measures for operators: When handling 14-OH BRs, wear protective clothing, gloves, and goggles to avoid direct contact with skin or eyes. In case of accidental exposure, rinse immediately with plenty of water and seek medical help if necessary.

6. Post-application Monitoring

①Observe plant responses: After application, monitor plant growth for 1–2 weeks. If symptoms like leaf curling, yellowing, or stunted growth appear, it may indicate excessive dosage or improper application, requiring timely adjustments (e.g., watering to dilute residues).

②Record-keeping: Document details such as application date, concentration, crop variety, and weather conditions. This helps summarize experience for future applications and trace back issues if they arise.

By adhering to these considerations, the application of 14-hydroxylated brassinosteroids can be optimized to achieve the desired regulatory effects on plant growth, yield, and stress resistance while minimizing risks.

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