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[1] Functional Characteristics
Vitamin B₁ is converted into thiamine pyrophosphate within plants, participating in sugar metabolism. It also inhibits the activity of cholinesterase and plays a crucial role in various cellular metabolic activities. Furthermore, vitamin B₁ can enhance the oxidative state of plant cell mitochondria, increase the activity of pyruvate dehydrogenase, and help cells rapidly release reactive oxygen species (ROS) when stimulated by stress factors. This activates downstream signals and induces plant resistance. Vitamin B₁ plays significant roles in regulating plant morphological development, adjusting nutritional functions, responding to environmental stress stimuli, and plant immunity.
[2] Application Techniques
Chinese Fir: Immediately after preparing the scion, immerse it in a mixed solution of 25–50 mg/L vitamin B₁ + 50 mg/L naphthaleneacetic acid (NAA) for 3–5 minutes. After the rootstock is cut and the cut surface coated with the mixed solution, quickly retrieve the scion and graft. The mixed solution was found to significantly promote callus formation and rooting. The survival rate using NAA alone was 83.3%, while combining it with vitamin B₁ increased the survival rate to over 90%. It was also observed that under the same NAA concentration, grafting survival rate increased with higher vitamin B₁ concentrations.
Corn: Vitamin B₁ improves the condition of crops suffering from inorganic nutrient deficiency. Magnesium-deficient corn plants showed approximately 5% recovery in normal growth and development after application of 20 mg/L vitamin B₁.
Wheat: Irrigating seedlings with 100–400 mg/L vitamin B₁ can promote resistance and alleviate salt stress damage in wheat.
Tomato: When plants show signs of nutrient deficiency, foliar spraying with 5 mg/L vitamin B₁ over the entire plant, followed by a second application after 7 days, significantly improves the condition of inorganic nutrient deficiency. It not only eliminates adverse effects caused by calcium deficiency but also increases plant dry weight and fruit yield.
Onion: Foliar spraying of onion with 100 mg/L vitamin B₁ increases dry matter yield and boosts the total nitrogen, phosphorus, and protein content in both bulbs and leaves.
Lettuce: Soaking seeds in 10–20 mg/L vitamin B₁ for 6–12 hours enhances the activity of nitrate reductase in lettuce leaves.
[3] Precautions
Avoid direct mixing with nitrites or alkaline pesticides to prevent deactivation.
