Application of Three Brassinolides with Different Structures in Cotton

doi:10.11924/j.issn.1000-6850.casb18100053

Abstract

Abstract: To determine the optimal regulation effect and the most efficient dosage of three different structural brassinolides (24-Epi, 28-Homo and 28-Epihomo) on cotton, laboratory experiment and field experiment were conducted. Indoor experiment was conducted with seed soaking, and field trials were carried out with stem and leaf spray at the seedling stage, boll stage and boll opening stage. The results showed that when the seed soaking dose was 0.01 mg/kg, the germination force and root vitality of cotton seeds were increased significantly with the three different structural brassinolide treatments. Compared with the control, when the spray dosage was 0.02 mg/kg, brassinolide improved the weight of bolls, fiber length and cotton uniformity, and also increased the yield to a certain extent. 28-Homo showed the best effect among the three brassinolides both in laboratory and field experiment. Therefore, to regulate the growth of cotton plants and increase the quality and yield of cotton, 28-Homo is recommended, and the seed soaking dosage is 0.01-0.02 mg/kg and the spray dosage is 0.02-0.04 mg/kg. There is no injury on cotton during the period of experiment.

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