Genetic, environmental effects and storage period in onion seeds quality

Abstract

ABSTRACT:In several species, seed longevity may be influenced by genotype and storage environment. It is scarce researches that evaluated those effects in onion seeds. From the exposed, it was aimed to evaluate the behavior from onion seeds of different genotypes stored in three conditions of relative humidity (25; 35 and 45% RH) monitored during six different storage periods. The research was executed at the Laboratório de Análise de Sementes e Recursos Genéticos from Universidade Federal de Uberlândia, Monte Carmelo Campus -MG. After harvested, the seeds of two cultivars were storaged in three conditions (SC): 25, 35 e 45% of relative humidity (RH). It was kept the same temperature (17ºC) in all storage conditions. After one year of storage, it was collected monthly seed samples of each genotype inside each storage condition for evaluation of physiological potential with vigor and germination tests. There was significant effect in germination and vigor of the seeds in the storage period and condition and in genotype versus environment, in all analysed variables. The quality of onion seeds may be influenced by genotype, storage conditions and storage period. The best condition to storage onion seeds is at 35% of RH. Seed deterioration was increased with storage period, although, short storage periods have increased germination rates.

Yield, Antioxidant Components, Oil Content, and Composition of Onion Seeds Are Influenced by Planting Time and Density

“…In previous investigations [43], the germination rate ranged between 80 and 90%. According to Maciel and coworkers [44], the genotype plays an important role on seed germinability in interaction with temperature, which is deemed crucial even by other authors [45]. Mollah et al [21] reported that the 15 November planting time resulted in the highest seed germination rate (84%), whereas 1 and 16 October had the lowest.…”

Qualidade fisiológica de sementes e Plântulas de Ingá armazenadas e semeadas em diferentes ambientes

“…Laime et al (2010) alcançaram de 72 a 100% de emergência de Inga ingoides dependendo da profundidade, as quais foram postas para secarem por um período de 12 horas, em ambiente de laboratório com temperatura de 24,5 ºC ± 0,5 °C. Desse modo, a emergência das plântulas é influenciada pelas práticas de semeadura, como a profundidade (FINCH-SAVAGE; BASSEL, 2016), bem como pelas condições de temperatura, e teor de umidade do ambiente de armazenamento, pois esta relação pode influenciar no equilíbrio de eventos metabólicos, no processo de deterioração e reações bioquímicas nas sementes, o que leva a perda do vigor (MACIEL et al, 2015;DIAS et al, 2016;NAGEL et al, 2016). A temperatura mais baixa pode ter causado danos relacionados a formação de cristais e ruptura das células consoante observações de Fonseca e Freire (2003), e a temperatura mais elevada pode ter provocado a degradação das membranas, fazendo com que no início da germinação a energia produzida fosse direcionada para recuperação destas membranas para assim dar início a germinação.…”