Efeito da hidratação e do condicionamento osmótico em sementes de pau-formiga

Mendonça, Andréa Vita Reis; Coelho, Erneida de Araújo; Souza, Nadia Aparecida de; Balbinot, Ernando; Silva, Roberto Ferreira da; Barroso, Déborah Guerra

doi:10.1590/s0101-31222005000200016

Cited by 9 publications

(5 citation statements)

References 8 publications

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“…HD cycles improved germination, mainly at extreme temperatures, both sub and supra-optimum (10 and 40 °C), not having much effects when the seeds were put to germinate at temperatures close to optimum (25 and 35 °C). These results corroborate those reported by Mendonça et al (2005) with the species Triplaris americana L. (Polygonaceae), whose germination percentage at sub-optimum temperature (20 °C) was favored by osmotic conditioning. In addition to these authors, Jeller and Perez (2003) also found in seeds of Senna spectabilis (DC.)…”

Section: Resultssupporting

confidence: 91%

Hydropriming changes temperature thresholds for seed germination of tree species from the Caatinga, a Brazilian tropical dry forest

2021

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This study evaluates the effects of hydration and dehydration cycles (HD cycles) on seed germination of four Caatinga tree species (Anadenanthera colubrina var. cebil, Enterolobium contortisiliquum, Pityrocarpa moniliformis and Pterogyne nitens) subjected to different temperatures and determine the thermal upper and lower limits of germination. For this, seeds were subjected to 0, 1, 2 and 3 HD cycles and set to germinate at temperatures of 5, 10, 15, 25, 35, 40 and 45 °C. Germinability and t50 were calculated and the differences of these parameters were compared by two-way ANOVA. In addition, germination rate (GR = 1/t50), as well as ceiling (Tc), optimum (To) and base (Tb) temperatures were calculated to estimate the limits below or above which the seeds fail to germinate. We observed that the more HD cycles, the better the seed responds, especially at extreme temperatures. Seeds of all studied species showed To between 25 and 35 °C, Tb < 10 °C, and Tc > 40 °C. The slope of regression curves for germination rate showed that submitting seeds to HD cycles expands its thermal tolerance range, revealing that this seed pre-treatment can be efficient for species as it increases their tolerance to thermal stress.

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Section: Resultssupporting

confidence: 91%

Hydropriming changes temperature thresholds for seed germination of tree species from the Caatinga, a Brazilian tropical dry forest

2021

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“…In other words, after tip removal there is no need to perform the conditioning in seeds of M. caesalpiniifolia. Mendonça et al (2005) and Pereira and Martins Filho (2012) found similar results in seeds of Triplaris americana L. and Solanum sessiliflorum Dunal., respectively, in which the osmotic conditioning did not influence the percentage of germination.…”

Section: Resultssupporting

confidence: 56%

DORMANCY OVERCOMING AND PRECONDITIONING IN Mimosa caesalpiniifolia Benth. SEEDS

et al. 2020

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Seeds of ‘sabiá’ (Mimosa caesalpiniifolia Benth.) have coat dormancy, which hampers the absorption of water and oxygen, thereby delaying germination. Thus, this study aimed to evaluate methods for overcoming dormancy associated with priming on germination and vigor of seeds of ‘sabiá’, considering the efficiency, practicality and cost of treatment. The experimental design was completely randomized, in a 4 x 5 factorial scheme (four methods for overcoming dormancy x five types of priming), constituting 20 treatments with four replicates of 25 seeds. The methods for overcoming dormancy used were tip removal, seed immersion in hot water at 100 °C for three minutes, immersion in sulfuric acid for 10 minutes and intact seeds. For the determination of physiological conditioning of seeds, the imbibition curve with the different priming agents was constructed. Priming was done on filter paper moistened with solutions of mannitol at the potentials of -0.2 MPa (16 hours), -0.4 MPa (24 hours) and -0.6 MPa (36 hours) and only with distilled water for the hydropriming (12 hours) and seeds without priming. The variables analyzed were first count of germination, germination, root length, shoot length and dry weight of seedlings. The data were subjected to analysis of variance by F test and Tukey test at 5% probability. The dormancy of M. caesalpiniifolia seeds should be overcome with the use of hot water (100 °C) for three minutes, without the need for priming.

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“…Nota-se que, para as sementes deterioradas por 72 horas, o tempo médio para germinação que foi de 8,7 dias (não condicionadas) diminuiu para 3,1 e 4,3 dias com o condicionamento por seis e oito dias, respectivamente. Os efeitos do condicionamento osmótico na velocidade da germinação têm sido evidentes, diversos trabalhos com diferentes espécies resultaram no aumentou da velocidade de germinação das sementes osmocondicionadas, incluindo, entre outros: "quaresminha" (Borges et al, 1994); "cebola" (Lopes et al, 1996;Trigo et al, 1999); "sorgo" (Carvalho et al, 2000); "aspargo" (Bittencourt et al, 2004) e "pau-de-formiga" (Mendonça et al, 2005)e "salsa" (Contreiras Rodrigues et al, 2009).…”

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Osmocondicionamento em sementes de pimenta 'amarela comprida' (Capsicum annuum L.) Submetidas à deterioração controlada

et al. 2010

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RESUMONeste trabalho, objetivou-se avaliar o efeito do condicionamento osmótico no desempenho de sementes de pimenta submetidas à deterioração controlada. Para tanto, sementes de pimenta 'Amarela Comprida' (Capsicum annuum L.), com teor de água ajustado para 24%, foram submetidas à deterioração controlada em banho-maria a 45ºC por 0, 24, 48 e 72 horas. Em seguida, foram osmocondicionadas em solução de PEG 6000 a -1,1 MPa, por 0, 6 e 8 dias. Avaliaram-se a germinação, primeira contagem de germinação, germinação a baixa temperatura, velocidade de germinação a 15ºC e a 25°C, massa seca de plântulas e comprimento de raiz primária. Verificou-se que o condicionamento osmótico foi benéfico à germinação das sementes de pimenta deterioradas por 48 e 72 horas, não prejudicando a germinação das sementes de alta qualidade fisiológica e ainda contribuiu para melhorar o vigor tanto das sementes não deterioradas quanto das deterioradas por 48 e 72 horas, constituindo-se em procedimento promissor para elevar a qualidade fisiológica das mesmas. Termos para indexação:Condicionamento osmótico, qualidade fisiológica, Capsicum annuum. ABSTRACTThe osmotic conditioning technique has been considered promising for improving the physiological potential of seeds of various species. In this context, the study aimed to evaluate the effect of osmotic conditioning on the performance of pepper seeds subjected to controlled deterioration. Thus, seeds of 'Long Yellow pepper' (Capsicum annuum L.), with water content adjusted to 24%, were subjected to controlled deterioration in water bath at 45 °C for 0, 24, 48 and 72 hours. After that, they were osmotic conditioning in PEG 6000 to -1.1 MPa during 0, 6 and 8 days. The germination, first count of germination, germination at low temperature, speed of germination at 15 º C and 25 °C, dry weight of seedlings and length of primary root were evaluated. It was found that the osmotic conditioning was beneficial to the germination of pepper seeds deteriorated by 48 and 72 hours, not affecting the germination of seeds of high physiological quality. It also helped to improve the strength of both the seeds that had not been damaged and those deteriorated by 48 and 72 hours, being a promising technique to increase their physiological quality. INTRODUÇÃOAs pimentas (Capsicum spp.) são cultivadas em todo o território nacional em regiões que vão desde as de clima subtropical, caso do Sul, até as de clima tropical, caso do norte e nordeste. Atualmente, o cultivo de pimentas tem assumido posição relevante no cenário nacional, em razão, principalmente, das demandas externas do mercado consumidor. As várias formas de utilização do produto como, por exemplo: molhos, conservas, geléias e pápricas, têm contribuído para a ampliação do setor agroindustrial da pimenta (Nascimento et al., 2006).A propagação da pimenta é feita por meio de sementes que, geralmente, apresentam baixas taxas de germinação e emergência de plântulas, o que justifica o uso de técnicas que contribuam para acelerar o processo de germinação e unifor...

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Efeito da hidratação e do condicionamento osmótico em sementes de pau-formiga

Cited by 9 publications

References 8 publications

Hydropriming changes temperature thresholds for seed germination of tree species from the Caatinga, a Brazilian tropical dry forest

Hydropriming changes temperature thresholds for seed germination of tree species from the Caatinga, a Brazilian tropical dry forest

DORMANCY OVERCOMING AND PRECONDITIONING IN Mimosa caesalpiniifolia Benth. SEEDS

Osmocondicionamento em sementes de pimenta 'amarela comprida' (Capsicum annuum L.) Submetidas à deterioração controlada

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