Umidade e aquecimento térmico na superação de dormência de sementes de dendezeiro tipo dura

Abstract

Green et al. Fontes de financiamento: Recursos custeados pelo Programa de Apoio à Fixação de Doutores no Amazonas FIXAM-AM-FAPEAM-AM-Edital nº 022/2013-Processo n o 062.01326.2014. E Embrapa-CPAA, pela disponibilização de infraestrutura e pessoal de apoio para desenvolvimento do projeto. Conflito de interesses: Os autores declaram não haver conflito de interesses.

Germination of tucumã (Astrocaryum aculeatum G. Mey.) as a function of thermal pretreatment and stratification temperature

“…According to Orozco-Segovia et al (2003) and Meerow and Broschat (2017), variations in the germinability of palm seeds occur due to the genotype, maturation stage, and seed management. Although pretreatment is used routinely in oil palm (Elaeis guineensis), recent studies have shown variations as a function of the genotype, seed water content, temperature, and time of exposure (Fondom et al, 2010;Guerrero et al, 2011;Green et al, 2013;Lima et al, 2014;Green et al, 2019).…”

“…High temperatures seem to have some effect in overcoming seed dormancy in some palm trees (Rees, 1962;Comont and Jacquemard, 1977;Carpenter et al, 1993;Fondom et al, 2010;Guerrero et al, 2011;Green et al, 2013;Schlindwein et al, 2013;Lima et al, 2014;Rodrigues et al, 2014;Ferreira and Gentil, 2017;Green et al, 2019). Some associations between high temperatures and the physiological effect on seed dormancy have been pointed out, such as the reduction in the concentration of abscisic acid in the embryo and endosperm (Finch-Savage and Leubner-Metzger, 2006;Jiménez et al, 2008), the alteration in the balance between abscisic acid and other plant hormones (Cui et al, 2020), and changes in sensitivity to plant hormones (Jiménez et al, 2008).…”

“…The use of high temperatures has been the focus of many studies related to overcoming dormancy in palm seeds. Thermal pretreatment is a common method for oil palm seeds (Elaeis guineensis), which have germination favored by temperatures between 38 and 42 °C for 30 to 80 days (Rees, 1962;Comont and Jacquemard, 1977;Fondom et al, 2010;Green et al, 2013;Green et al, 2019). According to Jiménez et al (2008), the marked reduction in the endogenous concentration of abscisic acid in oil palm embryos is an important factor in overcoming dormancy through heat (40 °C for 50 days), although the function of 3-indole acetic acid and changes in sensitivity to plant hormones cannot be ruled out.…”