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[1] Functional characteristics Carbamopurine is a synthetic cytokinin-like plant growth regulator that is absorbed by germinating seeds, roots, tender branches and leaves, and has low mobility in the body. Benzylaminopurine has a variety of physiological effects: promoting cell division, promoting the differentiation of undifferentiated tissues, promoting cell enlargement and growth, promoting seed germination, inducing the growth of dormant buds, inhibiting chlorophyll decomposition, delaying senescence, promoting or inhibiting enzyme activity, affecting the growth of stems, leaves and roots, breaking apical dominance, promoting lateral bud growth, promoting flower bud formation and flowering [2] Application technology a. Promoting seed germination and improving seedling resistance 1. Wheat: Soaking seeds in 15~20mg/L benzylaminopurine for 24h, or foliar spraying with 2.5~25mg/L solution at the 2-leaf 1-heart stage of wheat, can improve germination rate and germination potential, and can improve the seedlings’ ability to resist low temperature and drought, and can alleviate the damage of heavy metal stress to seedlings, but its effect varies depending on the wheat variety. 2. Rice: Soaking rice seeds in a 20 mg/L benzylaminopurine solution for 48 hours increased the germination rate by 5% compared to the control (water treatment), resulting in faster and more uniform germination. This improved seedling quality and enhanced stress resistance. The treatment was effective in preventing early rice seedling rot (48%) and increased the seedling establishment rate by 21.8%, thus increasing late-stage yield. 3. Corn: Soaking corn seeds in a 2.25 mg/L benzylaminopurine solution for 18 hours increased germination rate, resulting in robust seedlings with thicker roots, deeper leaf color, taller plants, and greater dry matter accumulation. Foliar spraying with a 2.25 mg/L benzylaminopurine solution at the 3-leaf, 1-heart stage increased photosynthetic rate, chlorophyll content, photosynthetic enzyme activity, and cell-protective enzyme activity in corn seedlings under water stress. It also reduced stomatal resistance and malondialdehyde content, mitigated reactive oxygen species damage to the membranes under water stress, and enhanced drought resistance in corn seedlings. 4. Potatoes: Soaking tubers in 10-20 mg/L benzylaminopurine for 6-12 hours can achieve rapid germination and strong seedlings. 5. Cotton: Soaking cotton seeds in 1.5-2 mg/L benzylaminopurine for 6-7 hours can promote the germination of aging cotton seeds and provide varying degrees of protection to the cell membrane system. 6. Melon: Soaking melon seeds in 20 mg/L benzylaminopurine for 6 hours can improve germination rate and accelerate seedling emergence; foliar spraying with 30-50 mg/L benzylaminopurine during the seedling stage can affect melon root growth, inhibiting stem thickening and root length, but can enhance peroxidase (POD) activity and improve seedling stress resistance. Tomatoes: Soaking tomatoes in 10 mg/L benzylaminopurine for 6 hours can promote tomato seed germination, significantly improve seed vigor, and have a significant impact on early growth such as radicle elongation and increased seedling fresh weight. Spraying chili pepper seedlings with 20-25 mg/L benzylaminopurine after transplanting can promote normal growth of chili pepper seedlings under high temperature stress. 7. Soaking cucumber seeds in 5 mg/L benzylaminopurine for 24 hours can delay the decrease in root activity and the increase in root conductivity in cucumber seedlings under waterlogging stress. This allows cucumbers under waterlogging stress to maintain higher levels of protective enzymes and alcohol dehydrogenase (ADH) activity for a longer period, thereby improving the cucumber’s resistance to waterlogging stress.