Características químicas e fisiológicas de frutos de crambe cultivados com aplicação de reguladores vegetais

• Autor(a) principal: Boiago, Nayara Parisoto
• Data de Publicação: 2017
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do UNIOESTE
• Texto Completo: http://tede.unioeste.br/handle/tede/3715
• topic: Crambe abyssinica Hochst Ex R.E. Fries; Oleaginosas; Vigor de sementes; Qualidade química de grãos; Pós-colheita; Crambe abyssinica Hochst Ex R.E.; Fries; Oilseeds; Seeds vigor; Grain chemical quality; Post haverst; CIENCIAS EXATAS E DA TERRA

Plant growth regulators (PGRs) can be applied in agricultural crops improving their development and, consequently, improves the quality of grains and seeds produced. This work aimed to evaluate the effect of foliar application of PGRs on crambe fruits quality grown in 2014 and 2015 harvests.When crambe plants were in transition from vegetative stage to flowering, indole-3-acetic 100 mg L-1 (IAA), 3-gibberellic acid P.A. 100 mg L-1 (GA3); commercial PGR Stimulate® 6 mL L-1 and a control treatment with distilled water were applicated in two 15-day intervals. Fruits produced by treated plants were harvested and prepared for further analyzes. For the post-harvest chemical quality analyzes, grains of each treatment with PGRs were stored at ambient conditions for 180 days and the parameters were analyzed at the beginning and at the end of storage. Water content, lipids by cold extraction (CE), lipids by heated extraction (HE), protein, acidity and antioxidant activity (AA) of crambe grains were determined and the significant difference between averages in three-way ANOVA (harvest year x PGR x storage) were compared by the Tukey test (p<0.05). A cluster analyzes was also performed to identify similarities between the chemical parameters studied. In the experimental stage regarding the physiological quality of crambe, seeds produced with PGR were analyzed by their percentage and germination speed index (GSI), moisture content, electrical conductivity (EC) and quantification of K, Ca and Mg leached. Treatments were compared with each other Tukey test and with control by Dunnett test (p<0,05). Grains stored for 180 days showed lower lipid CE and HE content. However, under the application of PGR, lipids content and AA did not change with storage, and grains acidity reduced. There was difference in each PGR effects between the harvests studied. In 2014, the application of IAA promoted improved results regarding grains quality, while in 2015, GA3 and Stimulate® stood out. PGR application also influenced the physiological quality of crambe seeds. The application of Stimulate® increased germination percentage and GSI, while IAA reduced germination, GSI and increased EC of crambe seeds. Seeds produced with IAA showed lower leaching of Ca and all the applied PGR reduced K leaching of crambe seeds. It is concluded that the foliar application of PGR culminates in effects on crambe quality and may be used as a management technique in order to improve post harvest quality of this crop.