Germinação de sementes de jenipapeiro submetidas à pré-embebição em regulador e estimulante vegetal

Abstract

RESUMOObjetivou-se avaliar a germinação de sementes e crescimento inicial de plântulas de jenipapo (Genipa americana L.) submetidas à pré-embebição em regulador e estimulante vegetal. Utilizou-se delineamento inteiramente casualizado com quatro repetições de 25 sementes e oito tratamentos, nos quais as sementes foram embebidas por 12 horas em: T1 -água, T2 Giberelina líquida a 4% de® a 10 mL L -1 . As sementes foram dispostas sobre folhas de papel toalha previamente umedecidas com água destilada e levadas para o germinador, regulado a 28ºC, avaliando-se porcentagem de germinação, comprimento da raiz, do hipocótilo e total da plântula 21 dias após a semeadura e Índice de Velocidade de Germinação. Não houve efeito da pré-embebição na germinação das sementes com variação entre 89 a 95%. Os resultados obtidos evidenciaram que a pré-embebição de sementes de jenipapo por 12 horas em 4% GA 3 L (50, 100 e 200 mL L -1) e Stimulate ® (10 mL L -1 ), proporcionam maiores índices de velocidade de germinação. O Stimulate ® 10 mL L-1 , em pré-embebição por 12 horas proporciona maiores comprimentos das raízes e total das plântulas de jenipapo em relação aos demais tratamentos. Termos para indexação:Genipa americana, ácido giberélico, Stimulate ® , crescimento. ABSTRACTThis work aimed to evaluate the genipap (Genipa americana L.) seed germination and its initial seedling growth, submitted to pre-soaking in regulator and vegetal stimulant. It was arranged in a randomized design with four repetitions of 25 seeds and eight treatments, in which seeds were impregnated for 12 hours: T1 -water, T2 Liquid gibberellins 4% GA 3 (GA 3 4% L) (50 mL), T7 -Stimulate® (5 mL L -1 ) e T8 -Stimulate® (10 mL L -1 ). The seeds were disposed on a paper, previously wet with distilled water and taken to the germinator chamber adjusted in 28ºC. There were evaluated the germination percentage, roots length, hypocotyls, and seedling 21 days after the seeding and the Germination Velocity Index. The results had shown that the genipap s seed pre-soaking for 12 hours in GA 3 4% L (50, 10 e 200 mL L -1 ) e Stimulate® (10 mL L -1 ), provides a higher germination velocity index. The Stimulate® 10 mL L -1 , in pre-soaking for 12 hours provides a higher root growth and increase the number of genipap seedlings, comparing with others treatments.

Foliar application of plant growth regulators changes the physiological quality of crambe seeds

“…The positive effect of Stimulate ® application on the germination speed has also been observed in soybean seeds (Moterle et al, 2011) and jeripape seeds (Prado Neto et al, 2007). Applying Stimulate ® in the production of soybean (Carvalho et al, 2013), bean (Abrantes et al, 2011), cowpea beans (Oliveira et al, 2015) and cotton (Silva et al, 2016) improved the vegetative development of these crops and increased the physicochemical quality of the grain, grain mass, yield and total dry biomass.…”

“…Plant growth regulators can be applied by foliar spraying during cultivation, with the purpose of improving vegetative characteristics such as the physicochemical quality of the grain, grain mass, yield and total dry biomass (Abrantes et al, 2011;Carvalho, Viecelli, & Almeida, 2013;Silva, Santos, Oliveira, Soares, & Sanos, 2016). In seeds, plant growth regulators commonly used directly to improve germinative performance, prolong vigour and overcome physiological dormancy (Prado Neto, Dantas, Vieira, & Almeida, 2007;Moterle et al, 2011;Nonogaki, 2014).…”

Plant growth regulators in the germination of Diospyros hispida A. DC. (EBENACEAE) seeds

“…Treatments with distilled water and gibberellic acid in seeds (T1, T2, T3, T4, T5, T6, T7 and T8), provided the highest germination rate and speed values (from 80 to 91% and 0.80 to 0.91, respectively) ( Table 1), indicating that the form of GA3 application at the concentrations used did not influence the germination performance regardless of imbibition time even in water immersion or GA3 treatments. Prado-Neto et al (2007) observed positive effect of gibberellic acid at concentrations of 100 to 150 mL L -1 , and negative effect of biostimulant at concentration of 5 mL L -1 for the germination speed index in genipapo seeds (Genipa americana L.). The absorption of solutions by seeds must occur at rate that allows the repair and / or reorganization of membranes at appropriate levels to activate metabolism in phase I.…”

“…Growth regulating substances can act alone or in synergy with others (Prado-neto, et al, 2007). Currently, Stimulate® biostimulant compound is available on the market, which is composed of 0.009% kinetin (cytokinin), 0.005% gibberellic acid (gibberellin) and 0.005% indolbutyric acid (auxin).…”

Qualidade fisiológica de sementes de pitangueira submetidas a diferentes procedimentos de secagem e substratos - Parte 1

“…(Nietsche et al, 2004), maracujá (Passiflora spp.) , pinha (Annona squamosa L.) (Wagner Júnior et al, 2006) e jenipapo (Genipa americana L.) (Prado Neto et al, 2007) foram secadas à sombra nos referidos trabalhos.…”