Germinação e desenvolvimento de plântulas de pinhão manso sob condições de estresse hídrico simulado

Pereira, Márcio Dias; Lopes, José Carlos

doi:10.5433/1679-0359.2011v32n4sup1p1837

Cited by 10 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ávila et al (2007) found an accentuated reduction in germination of canola seeds when submitted to the more negative osmotic potential. Pereira and Lopes (2011) observed a drastic germination reduction, germination speed, and performance of Jatropha seeds in potential -0.2 MPa and Teixeira et al (2011), working with Crambe seed, found a significant reduction of germination and vigor in seeds submitted to more negative osmotic potential, with no formation of normal seedlings in potential inferior to -0.6 MPa.…”

Section: Discussionmentioning

confidence: 91%

Research Article Physiological and enzymatic alterations in sesame seeds submitted to different osmotic potentials.

et al. 2017

View full text Add to dashboard Cite

ABSTRACT. With the imminence of global climate changes that affect the temperature and the rainfall uniformity, it is growing the concern about the adaptation of crops to the water deficit. Thus, the objective of this study was to evaluate alterations in physiological and enzymatic mechanisms during the germination process of sesame seeds under different water availability. To simulate the water restriction we used PEG6000, a high molecular weight molecule that does not penetrate the seed structure but allows different osmotic potentials. The treatments were -0.1, -0.2, and -0.3 MPa, and the control. Germination, first-count germination, germination velocity index, and length and dry mass of the hypocotyl and radicle were performed. The seeds were weighed before and after treatments every 3 h. After each weighing, 100 seeds were taken for analysis of the enzymes alcohol dehydrogenase (ADH), malate dehydrogenase, esterase, catalase (CAT), superoxide dismutase (SOD), isocitrate lyase (ICL), and glutamate dehydrogenase (GTDH). The statistical design was completely randomized with five replications. PEG6000 prolonged ADH activity during the beginning of germination, maintaining the anaerobic metabolism for longer. Subsequently, their activity was reduced, as well as ICL, favoring the deterioration of the seeds that take the time to germinate. Behavior was evidenced by the appearance of SOD, CAT, and GTDH isoforms after 24 h of imbibition when water restriction was imposed. Therefore, the PEG600 is efficient in simulating water deficit conditions in future scenarios of climate change, offering impotent information regarding the germination behavior of the plants under these conditions.

show abstract

Section: Discussionmentioning

confidence: 91%

Research Article Physiological and enzymatic alterations in sesame seeds submitted to different osmotic potentials.

et al. 2017

View full text Add to dashboard Cite

show abstract

“…(Gordin et al 2015), Petiveria alliacea L. (Lavezo et al 2015), Cicer arietinum L. (Naim & Ahmed 2015), Jatropha curcas L. (Pereira & Lopes 2011) e Euryodendron excelsum H. T. Chang (Shen et al 2015) verificando-se redução na porcentagem de germinação, com o aumento da concentração de polietileno glicol. Adicionalmente, o potencial hídrico a partir de -0,6 MPa torna-se uma condição limitante na germinação e formação de plântulas normais de Amburana cearensis (Allemão) A.C. Smith (Almeida et al 2014).…”

Section: Resultsunclassified

“…Da mesma forma, Pereira & Lopes (2011) observaram que, em sementes de pinhão-manso (Jatropha curcas L.), a redução do potencial osmótico do substrato reduziu expressivamente a germinação das sementes, bem como a velocidade de germinação e o desempenho das plântulas. De acordo com Cardoso (2012), a embebição prévia das sementes numa solução osmótica, principalmente de polietileno glicol, atua inibindo a quantidade e a velocidade de absorção de água, impedindo assim a protrusão radicular.…”

Section: Resultsunclassified

Resposta fisiológica de sementes de chia e linhaça ao estresse hídrico

Viana

Neves

2017

Iheringia Ser Bot

View full text Add to dashboard Cite

RESUMO -Estudos sobre relações hídricas são importantes para o conhecimento da germinação das sementes. O objetivo deste estudo foi avaliar a resposta fi siológica (germinação) das sementes de chia e linhaça ao estresse hídrico. As sementes foram colocadas sobre papel embebido em solução aquosa de polietileno glicol em diferentes potenciais osmóticos. Foram avaliados a percentagem de germinação, primeira contagem e índice de velocidade de germinação. A redução do potencial osmótico do substrato promoveu decréscimo signifi cativo na germinação das sementes de chia e linhaça. Conclui-se que as sementes destas espécies não toleram potenciais osmóticos iguais ou inferiores a -0,15 MPa, sendo possível o seu cultivo em áreas agrícolas nas concentrações acima destes potenciais. Palavras-chave:Linum usitatissimum L., polietileno glicol, Salvia hispanica L.ABSTRACT -Physiological response of chia seeds and linseed to water stress. Studies on water resources are important to understand seed germination. The objective of this study was to evaluate the physiological (germination) response of chia seeds and linseed to water stress. The seeds were placed on paper soaked in solutions of polyethylene glycol in diff erent osmotic potentials. Percentage of germination, fi rst germination count, and germination speed index were evaluated. The reduction of the osmotic potential of the substrate promoted a signifi cant decrease in the germination and vigor of the chia seeds and linseed. In conclusion, seeds of these species are not able to tolerate osmotic potentials equal to or lower than -0.15MPa, being making possible its cultivation areas with concentrations above osmotic potentials.

show abstract

“…With reduction of hydric potentials, Pereira & Lopes (2011) found a reduction in the length of A. leiocarpa seedlings when submitted to PEG 6000 solution.…”

Section: /7mentioning

confidence: 96%

Ecophysiology of Germination of Parkia platycephala Benth. Seeds

et al. 2019

View full text Add to dashboard Cite

Water is considered the most important environmental resource for the germination process. This study aimed to evaluate the germination performance of Parkia platycephala seeds under different conditions of water and saline stress. Seed germination was tested with solutions of poly (ethylene glycol) 6000 and sodium chloride (NaCl) at seven osmotic potentials [0.0,-0.2,-0.4,-0.6,-0.8,-1.0, and-1.2MPa (megapascal)] and four replicates with 25 seeds in a completely randomized design, simulating the water and saline stress levels, respectively. The following seedling variables were evaluated: germination percentage, germination speed index, length, and dry mass. Results showed significant interaction between the agent and the osmotic potential for all evaluated variables. P. platycephala seeds presented higher tolerance to saline stress simulated by NaCl than to water stress, showing germination performance appropriate for glycophyte plants.

show abstract

Germinação e desenvolvimento de plântulas de pinhão manso sob condições de estresse hídrico simulado

Cited by 10 publications

References 8 publications

Research Article Physiological and enzymatic alterations in sesame seeds submitted to different osmotic potentials.

Research Article Physiological and enzymatic alterations in sesame seeds submitted to different osmotic potentials.

Resposta fisiológica de sementes de chia e linhaça ao estresse hídrico

Ecophysiology of Germination of Parkia platycephala Benth. Seeds

Contact Info

Product

Resources

About