Condicionamento fisiológico de sementes de soja com 24-epibrassinolídeo

Abstract

Soybean cultivation has increased productivity due to the application of technology by farmers. The physiological conditioning of seeds characterized in a promising alternative, aiming the benefits in relation to the germination and emergence of seedlings, especially under less favorable conditions. The association of this technique with 24-epibrasinolide (24-EpiBL), is able to result in additional benefit, favoring the development of seedlings. Based on the above, this study aimed to evaluate the efficiency of the 24-epibsininidide physiological conditioning in soybean seeds. The study was conducted in three stages and four lots of soybean seeds, cultivar M 8349 IPRO, were used. The first stage consisted in the evaluation of the initial physiological potential, absorption curve and study of the drying period of the seeds; the second stage consisted of hydrocondicionamento; in the third stage, the physiological conditioning was performed with 24-EpiBL at concentrations 10-6 and 10-8M. The physiological potential before and after hydro-conditioning and conditioning with 24-EpiBL was evaluated by germination and vigor tests (first count, germination speed index, accelerated aging with saturated solution, electrical conductivity and seedling length). However, the hydrocondicionamento and physiological conditioning techniques with 24-EpiBL were not beneficial for the lots studied.