Curva de absorção de água EM sementes de pinhão-manso (Jatropha curcas L.)

Araújo, Roberto Fontes; Zonta, João Batista; Araújo, Eduardo Fontes; Donzeles, Sérgio Maurício Lopes; Costa, Gustavo Pires

doi:10.4067/s0718-34292014000200002

Cited by 5 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According to Carvalho e Nakagawa (2012), the cotyledonary seeds end phase I and enter phase II when water contents between 35 and 40% are reached. The duration of each phase depends on the inherent properties of seeds and environmental conditions (Evencio et al 2011;Araujo et al 2014). In this study, the second phase of imbibition was marked by the consistent decrease in water absorption, as described in Bewley et al (2013), which persisted during the next 180 hours, with seed weight stabilizing at 0.14 g. For most orthodox seeds, this new mass stabilization indicates the beginning of the stationary phase of the imbibition curve, when the metabolic activities of the seeds are expected to resume (Finkelstein, 2004).…”

Section: Resultsmentioning

confidence: 99%

Physiological quality of Moquiniastrum polymorphum seeds processed with a general seed blower

et al. 2022

View full text Add to dashboard Cite

This study evaluates the physiological quality of Moquiniastrum polymorphum seeds, processed by a General seed blower, based on their germinability at different temperatures and on the imbibition curve, aiming to support future studies of M. polymorphum seeds processed by a General seed blower. Seeds were characterized regarding moisture, purity, germinability and thousand seed weight. The experiment was carried out in a completely randomized design (CRD). To characterize the triphasic process of germination, the imbibition curve during seed germination was modelled using 2 samples of seeds weighing 0.05 g. Physiological seed quality was assessed using a thermogradient table at 15, 20, 25, 30, 35 and 40 °C (with constant light supply) and by calculating the germination speed index (GSI), along with the time to reach 50% germination (T50) and uniformity of germination (U75-25). Each temperature treatment included 4 replications of 50 seeds each. It was found that the optimum temperature for germination was 30 °C with constant light supply, resulting in higher means of normal seedlings, GSI, T50 and U75-25. Moreover, the imbibition curve at 30 °C and constant light supply exhibited a triphasic pattern common to seed germination. In conclusion, the new findings on the germinative potential of M. polymorphum seeds processed by a General seed blower uncovered here can be applied in the methodology of future studies of M. polymorphum or used as recommendations for species of the same genus

show abstract

Section: Resultsmentioning

confidence: 99%

Physiological quality of Moquiniastrum polymorphum seeds processed with a general seed blower

et al. 2022

View full text Add to dashboard Cite

show abstract

“…2 F e I), permitindo a entrada de água e germinação elevada quando comparadas com o controle. Resultados semelhantes foram encontrados em sementes de Macroptilium martii Benth no qual Araújo et al (2014), obtiveram 74% de sementes germinadas em sua curva de embebição utilizando ácido sulfúrico durante três minutos.…”

Section: Discussionunclassified

Curva de embebição, anatomia e mobilização de reservas em sementes de Mimosa flocculosa submetidas à superação de dormência

et al. 2021

View full text Add to dashboard Cite

RESUMO -O trabalho teve como objetivo ampliar o conhecimento sobre a germinação de Mimosa flocculosa Burkart e eficiência dos tratamentos de superação de dormência com foco na embebição, mobilização de reservas, anatomia tegumentar e germinação das sementes. Foi realizada a curva de embebição e a partir desta, foi estipulado o perfil trifásico para os três tratamentos: controle, água a 80 °C por 10 minutos e ácido sulfúrico 98% por três minutos. Foram analisados durante a embebição os açúcares, proteínas e anatomia tegumentar das sementes, junto com a germinação, verificando: porcentagem, frequência e sincronização da germinação. Nossos resultados demonstraram que os dois métodos utilizados de superação de dormência nas sementes de M. flocculosa são indicados, pois estimularam uma curva de embebição mais uniforme, maior degradação de açúcares e proteínas, o tegumento destes tratamentos apresentou fissuras e desestruturações auxiliando a entrada de água, elevando a germinação e com tendência à sincronização.Palavras-chave: espécie nativa, germinação, tegumento duro ABSTRACT -Imbibition curve, anatomy and mobilization of reserves in seeds of Mimosa flocculosa Burkart submitted to overcoming of dormancy. This study aimed to expand knowledge about Mimosa flocculosa Burkart seed germination and efficiency of break dormancy treatments, focusing on hydration, reserves mobilization, integument anatomy and seed germination. We conducted a hydration curve, and from that, we stipulated a three-phase profile for each treatment: control, water at 80 ºC for 10 min and sulfuric acid 98% for 3 min. Sugars and proteins, integumentary anatomy and germination parameters (germination percentage, frequency and synchrony of germination) were analyzed during hydration. Our results showed that the overcoming dormancy methods used in M. floculosa seeds are indicated, since they improved germination, uniformed hydration, presented integument fissures and destabilizations increasing water uptake and germination synchrony.

show abstract

“…This three-phase pattern has already been observed in seeds of several species, such as Schinopsis brasiliensis Engl. (Anacardiaceae) (Dantas et al 2008); Jatropha curcas L. (Euphorbiaceae) (Araujo et al 2014) and Senna spectabilis (DC.) H.S.…”

Section: Discussionmentioning

confidence: 99%

Effect of hydration and dehydration cycles on Macroptilium atropurpureum seeds germination under water deficit conditions

Lima¹,

Oliveira²,

Meiado³

2018

Commun. Plant Sci.

View full text Add to dashboard Cite

The imbibition process, which is essential for seed germination, can be interrupted due to lack of water in the environment. Once this occurs, seeds have its germination process interrupted and loses the water absorbed to the environment. The objective of this study was to evaluate the effects of hydration and dehydration cycles (HD cycles) on seed germination of Macroptilium atropurpureum under water deficit conditions. Seeds of M. atropurpureum were submitted to 0 (control), 1, 2 and 3 HD cycles at different hydration times. In addition, the seeds were also submitted to osmotic potentials of 0.0, -0.1, -0.3, -0.6 and -0.9 MPa for water deficit simulation. Although the seeds germinated in all of the osmotic potentials used, the seeds presented a reduction in the percentage of germination, independently of the number of HD cycles and the hydration time between each cycle. In addition, HD cycles also negatively affected the mean germination rate, promoting a reduction of this parameter as seeds were submitted to HD cycles and osmotic potentials. Thus, the results demonstrated that HD cycles did not provide an increase in water stress tolerance in M. atropurpureum seeds during germination. Highlighted Conclusions 1)Macroptilium atropurpureum seeds can germinate even in low osmotic potentials conditions. 2) Discontinuous hydration confers a negative effect on M. atropurpureum germination and does not provide a greater tolerance to water deficit.Seed imbibition is a key process in the plant life cycle determining whether seed germination and individual growth will be successful or not (Ribeiro et al. 2015). The imbibition process, which is essential for seed germination, can be interrupted due to lack of water in the environment. Once this occurs, the seed has its germination process interrupted and loses the water absorbed to the environment (Fenner and Thompson 2005). These interruptions during germination process occur in arid and semi-arid environments, where water presents a limit of space and time in its availability, subjecting seeds to hydration and dehydration cycles (HD cycles) (Lima and Meiado 2017). Dubrovsky (1998) pointed that discontinuous hydration ensures a high survival rate during desiccation, demonstrating that seeds may present seed hydration memory, caused by the discontinuous imbibition process.In addition to the high survival rate during desiccation highlighted by Dubrovsky (1998), HD cycles may provide other advantages during the germination process of the seeds of some species. Rito et al. (2009) demonstrated that seeds of Cereus jamacaru DC. subsp. jamacaru (Cactaceae) present seed hydration memory, since, after being submitted to HD cycles, seeds had their percentage of seed germination increased. Pedrero-López et al. (2016), in experiments with seeds of Dodonaea viscosa Jacq. (Sapindaceae) also observed a significant increase of germinability after HD cycles from 22.5% to 63.3%. Discontinuous hydration may also provide greater tolerance to abiotic stress conditions, as observed by Li et ...

show abstract

Curva de absorção de água EM sementes de pinhão-manso (Jatropha curcas L.)

Abstract: Curva de absorção de água EM sementes de pinhão-manso (Jatropha curcas L.)Water absorption curve in seeds of physic nut (Jatropha curcas L.) Roberto

Cited by 5 publications

References 5 publications

Physiological quality of Moquiniastrum polymorphum seeds processed with a general seed blower

Physiological quality of Moquiniastrum polymorphum seeds processed with a general seed blower

Curva de embebição, anatomia e mobilização de reservas em sementes de Mimosa flocculosa submetidas à superação de dormência

Effect of hydration and dehydration cycles on Macroptilium atropurpureum seeds germination under water deficit conditions

Contact Info

Product

Resources

About