Qualidade de sementes e produ??o de mudas de Moquiniastrum polymorphum (Less.) G. Sancho

• Autor(a) principal: Faria, J?lio C?zar Tannure
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Texto Completo: https://tede.ufrrj.br/jspui/handle/jspui/1958
• topic: Gochnatia polymorpha; cambar?; qualidade de semente; raios X; mini-SAS; quality seed; X-ray; seed blower; soprador de sementes; Recursos Florestais e Engenharia Florestal

This chapter analyzes physical and physiological properties of Moquiniastrum polymorphum seeds with mini-SAS, X-ray and seed blower equipments, and to evaluate germination at different temperatures and generating the imbibition curve of the species. The experiments were conducted at the Seed Laboratory of the Department of Forest Sciences and Seed Analysis Laboratory of the Department of Agriculture of the Federal University of Lavras, in Lavras-MG. The seeds were acquired by the company ?Sementes Cai?ara?, which were collected in arrays located in the municipality of Pen?polis-SP, in December 2014. After acquired and processed, the lot of seed was characterized by the purity tests, humidity, germination and thousand seed weight. The three main equipment used in the classification, evaluation and separation of the seeds were the equipment mini-SAS, x-ray and blower seed type General. In the X-ray test the seeds were classified according to the internal morphology displayed in the radiographic images, are classified as full seeds, empty or malformed. The seed samples identified by X-ray analysis were taken to germinate, each rank four replicates of 50 seeds. The full, empty and malformed seeds were evaluated externally by the mini-SAS equipment, through the characteristics: dominant color, area, maximum diameter, minimum diameter ratio maximum/minimum diameter and circumference. Each seed group consisted of four replications of 50 seeds. Other equipment used was the seed blower unit, which separated the seeds for the regulation of six different openings, with each of them a light fraction and one heavy. Evaluations were made by weighing the seeds remaining in the blower (heavy fraction) and the number of full seeds in this same fraction made by ray analysis X. Later germination tests were carried out consisting of four repetitions of 50 seeds. Regarding the germination study, the experiment was conducted in thermogradient table at temperatures of 15?C, 20?C, 25?C, 30?C, 35?C and 40?C with supplying constant light, each treatment consisting of four replications of 50 seeds. They were evaluated root issue, normal and abnormal seedlings, hard seeds and dead, in addition to IVG values, T50 and U75-25 to root issue, normal seedling. In determining the imbibition curve germination were tested under conditions of 30?C with constant light and 20-30?C (12h dark, 12h light). The curves were drawn from two replicates of 0,05g seed, the same being weighed in analytical balance for every three hours. After analyzing the data, it was concluded that the use together of seeds and ray blower devices are effective for evaluation and determination of the physical quality of the seeds M. polymorphum. Seed blower in regulating the opening 5 resulted in the better quality of the lot, with the largest number of full seeds. The external parameters assessed by the mini-SAS equipment were not able to qualitatively evaluate the seeds of M. polymorphum, not recommended its use to characterize them. In the germination of study at different temperatures, the best average values of the evaluated criteria resulted in 30?C temperature. In determining the curve imbibition, the seed germination phase pattern presented, and the root emission resulting in a smaller time interval at a temperature of 30?C with constant light, as evidenced from the imbibition phase III