Seed quality of crambe (Crambe abyssinicaHochst) submitted to different drying methods

Abstract

-The objective of this research was to evaluate the effects of different drying methods on physiological quality of crambe seeds. Crambe seeds of FMS Brilhante cultivar were produced in the Lageado experimental farm (UNESP, Botucatu, Brazil) in 2012. The drying methods were: artificial drying with hot air, artificial drying with fresh air, natural yard drying, natural shade drying and natural field drying. The water content of seeds was monitored before, during and after drying. Germination, first germination count, abnormal seedlings, GSI, germination synchronization, frequency and germination mean time, electrical conductivity, fatty acid index and oil content were evaluated in order to know the physiological quality. The experimental design was randomized and the averages compared by the t-test at 5% significance. Results showed that artificial hot air drying favored with higher germination and vigor of crambe seeds when compared to other drying methods and demanded shorter time to reduce the water content. The natural shade drying method is feasible for crambe seeds despite taking longer.Key words: Natural drying. Artificial drying. Crambe seeds vigor. Seeds damage.RESUMO -Objetivou-se nesta pesquisa avaliar o efeito de diferentes métodos de secagem na qualidade fisiológica de sementes de crambe. As sementes de crambe da cultivar FMS Brilhante foram produzidas na Fazenda Experimental Lageado (UNESP -Botucatu) no ano de 2012. As condições de secagem foram: secagem artificial com ar aquecido, secagem artificial com ar natural, secagem natural em terreiro, secagem natural à sombra e secagem na planta. O teor de água foi monitorado antes, durante e após a secagem. Para avaliação da qualidade fisiológica foi realizado o teste de germinação, primeira contagem de germinação, plântulas anormais, IVG, sincronização da germinação, frequência e tempo médio de germinação, teste de condutividade elétrica, índice de acidez graxa e teor de óleo. O delineamento experimental foi inteiramente casualizado e as médias comparadas pelo teste de Tukey a 5% de significância. Pelos resultados obtidos a secagem artificial com alta temperatura favoreceu obtenção de sementes de crambe com alta germinação e vigor em relação aos demais tipos de secagem com um tempo menor para redução do teor de água. A secagem natural na sombra é viável para sementes de crambe apesar de ser longa.Palavras-chave: Secagem natural. Secagem artificial. Vigor de sementes de crambe. Danos em sementes.

Crambe abyssinica a non-food crop with potential for the Mediterranean climate: Insights on productive performances and root growth

“…In the current study, crambe seeds germinated rapidly, and germination energy was practically identical after 4 and 7 days of germination. Our results clearly contradict other authors' findings who reported considerable differences in germination energy between the first and last day of the germination test (Cruz et al, 2013;Leão et al, 2016;Silva et al, 2016;Soares et al, 2018). These differences could be attributed to the high physiological quality of crambe seeds reproduced in Central-Eastern Europe or variations in the anatomy or physicochemical properties of the pericarp and/or the seed coat which determine the rate of seed imbibition and early embryo development.…”

Storage Potential of Peeled Crambe for Oil Quality

“…During the storage period, both silo and paper bags were kept in the natural environment of a laboratory,with daily temperature and relative humidity monitoring. In addition to water content, crambe quality was monitored based on fatty acid analyses performed according to Silva et al (2016b). Tests of acidity and peroxide indices were performed in the crude oil extracted from crambe fruits, as described by Santos (2016).…”

“…On the other hand, the absence of peel, exposing the product to the adverse conditions of the storage environment, with possible impairment of its storage potential, should be considered. Silva et al (2016aSilva et al ( , 2016b assessed seed quality and pigmentation in the peel and oil of crambe fruits and concluded that post-harvest procedures are essential in defining the final characteristics of seed and oil, which presented significant variations in their viability and final staining as a function of the used drying method.…”

Use of radiographic images for rapid and non-destructive assessment of crambe seed quality

“…To maximize the productivity potential of the crop, one of the main requirements is satisfactory establishment of plant population in the field, which requires the use of seeds with high physiological quality (Leão et al, 2016). For crambe, germination and vigor tests, such as electrical conductivity, accelerated aging, cold test and seedling length measurements have been used to classify seed lots in terms of quality, serving as support for decision making in the seed industry (Soares et al, 2018;Machado et al, 2017;Silva et al, 2016).…”