Navegando por Autor "Gomes-Junior, Francisco Guilhien"

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Digital images of seedling for evaluating coffee seed vigor
(Associação Brasileira de Tecnologia de Sementes - ABRATES, 2019) Trujillo, Heiber Andres; Gomes-Junior, Francisco Guilhien; Cicero, Silvio Moure
The digital image analysis of seedlings has become largely employed in seed quality-control programs due to its feasibility, objectivity and fast results. Despite these advantages, no studies have yet demonstrated the efficiency of this technique for analyzing coffee seed vigor. The present study aimed at evaluating the efficiency of the Seed Vigor Imaging System (SVIS®) in determining the vigor of coffee seeds (Coffea arabica L.) from digital images of seedlings. Also, the results of these analyses were contrasted with conventional vigor tests. Six seed lots from each cultivar, Bourbon and Catucaí 20/15, were used. The research was conducted in two experimental times, and the seed vigor was determined by the tests of first germination count, accelerated aging, electrical conductivity, primary root protrusion speed, as well as by the analysis of scanned images of seedlings, made possible by the SVIS® software. For the Bourbon and Catucaí 20/15 cultivars, the SVIS® analysis was able to discriminate lots of both high and low vigor (vigor indexes of 317 to 752, and 181 to 703, respectively). A similar outcome was obtained from the conventional tests appraised in this research. Eventually, it was possible to conclude that the digital analysis of 20-day-old seedlings by SVIS® is an efficient method to evaluate coffee seed vigor.
Radiographic analysis and performance of coffee seeds
(Associação Brasileira de Tecnologia de Sementes - ABRATES, 2019) Trujillo, Heiber Andres; Gomes-Junior, Francisco Guilhien; Lara, Idemauro Antonio Rodrigues de; Cicero, Silvio Moure
Radiographic analysis has been efficient in identifying the main changes in the internal morphology of seeds, being increasingly used in quality control programs due to their practicality, objectivity and speed in obtaining the results. Despite these advantages, there are still no studies proving the efficiency of these techniques for coffee seed analysis. Thereby, the aim of this research was to evaluate the internal morphology of coffee seeds (Coffea arabica L.) through the analysis of radiographic images and their relation with germination performance. Radiographic images of seeds of the cultivars Bourbon and Catucaí 20/15, each represented by six lots, were examined and the seeds were seeded and seedling emergence, shoot length, stem diameter and shoot dry mass were evaluated. Seeds of Bourbon presented high percentage of intact seeds, as well as better performance in the germination of the lots compared to Catucaí 20/15, which presented more incidence of damaged seeds and lower germination. The radiographic images allowed identifying seeds with malformations, tissue deterioration and damage caused by the coffee borer. This non-destructive imaging technique is efficient in identifying intact seeds, with potential to germinate and produce vigorus seedlings.