Effects of water deficit and pH on seed germination and seedling development in Cereus jamacaru

Ortiz, Thiago Alberto; Urbano, Mariana Ragassi; Takahashi, Lúcia Sadayo Assari

doi:10.5433/1679-0359.2019v40n4p1379

Cited by 8 publications

(8 citation statements)

References 29 publications

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“…However, for KCl, there was a marked tolerance of the seeds regarding this variable up to the -0.8 MPa potential, with germination higher than 80%, thus indicating greater seed resistance to the effects of this salt at more negative osmotic potentials. Ortiz et al (2019) found that C. jamacaru seeds, when subjected to water stress induced by polyethylene glycol, reduced their germination potential at osmotic potentials lower than 0.0, with no germination observed at -1.0 MPa.…”

Section: Resultsmentioning

confidence: 94%

Water restriction in seeds of Cereus jamacaru DC.

Silva

Azerêdo

Ferreira

et al. 2021

Agraria

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Mandacaru (Cereus jamacaru DC.) is a cactus widely found in the Caatinga, with its seeds usually subjected to adverse conditions. Therefore, the objective of this study was to evaluate the effect of water restriction on germination and vigor of mandacaru seeds by using different salts and osmotic potentials. To that end, we used saline solutions of NaCl, KCl, CaCl 2 and MgCl 2 prepared at the osmotic potentials of 0.0; -0.2; -0.4; -0.6; -0.8; -1.0 and -1.2 MPa. Four replicates of 50 seeds per treatment were used, distributed in "gerbox" boxes between blotter paper and under temperature of 25 °C. Counts of the number of germinated seeds were performed daily for 21 days after root protrusion. The variables analyzed were the following: water content (%), germination (%), mean germination time and normal seedlings (%). A completely randomized following the factorial scheme 4 × 7 (salts × osmotic potentials) was employed. Results obtained suggest that mandacaru seeds show the ability to germinate in saline soils, a characteristic found in arid and semi-arid areas. Decreased osmotic potential promoted reductions in germination (%) and vigor of Cereus jamacaru DC seeds. The MgCl 2 salt was the one that most negatively affected the germination and initial seedling development.

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Section: Resultsmentioning

confidence: 94%

Water restriction in seeds of Cereus jamacaru DC.

Silva

Azerêdo

Ferreira

et al. 2021

Agraria

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“…Os autores ainda verificaram que houve germinação (< 5%) nos potenciais hídricos de -0,6 e -0,8 MPa. Ortiz, Urbano e Takahashi (2019) [15] também constataram baixos percentuais de germinação das sementes de mandacaru nos potenciais de -0,6 e -0,8MPa com valores de 2,86% e Facheiro = 57,0/(1 + e 122,38 (x -0,38) ) R 2 = 1,0 Mandacaru = 88,16/(1 + e 24,74(x-0,36) ) R 2 = 0,99 0,36%, respectivamente, sob a temperatura de 25 °C. Resultados similares foram encontrados no presente trabalho, cujos percentuais de germinação das sementes de mandacaru foram de 2% (-0,6…”

Section: Resultsunclassified

“…Assim, o entendimento sobre a tolerância das plantas ao estresse hídrico e como explorá-las, é de extrema importância [13]. Estudos sobre as exigências hídricas para germinação das sementes de cactos podem ser esclarecedores para se conhecer as estratégias de sobrevivência desse grupo de plantas, uma vez que poucos são os dados encontrados na literatura, a exemplo dos trabalhos com Cereus jamacaru [14,15], Hylocereus spp. [8,16,17], Pereskia grandifolia [18], Pilosocereus catingicola [19,20] e Discocactus spp.…”

Section: Introductionunclassified

Resposta germinativa de sementes de cactáceas colunares sob diferentes regimes de temperatura e de potencial hídrico

2021

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O mandacaru (Cereus jamacaru DC. subsp. jamacaru) e o facheiro (Pilosocereus pachycladus F.Ritter subsp. pernambucoensis (F.Ritter) Zappi) são duas cactáceas colunares endêmicas do semiárido brasileiro, região caracterizada por apresentar áreas em que ocorre déficit hídrico. Assim sendo, este estudo objetivou avaliar o efeito do estresse hídrico sobre a germinação e o vigor de sementes dessas duas espécies sob diferentes temperaturas e potenciais hídricos. Para simular o estresse hídrico foram utilizadas soluções de polietilenoglicol (PEG 6000) nos seguintes potenciais hídricos: 0,0 (controle); -0,2; -0,4; -0,6 e -0,8 MPa. As sementes foram distribuídas em caixas tipo “gerbox” entre papel “mata borrão”, sob as temperaturas de 25 e 30 °C. A contagem do número de sementes germinadas foi realizada diariamente durante 21 dias após a protrusão radicular. As variáveis analisadas foram: teor de água (%), germinação (%), índice de velocidade de germinação (IVG) e tempo médio de germinação (TMG). O delineamento foi inteiramente casualizado seguindo o esquema fatorial de 2 × 5 (temperatura × potencial hídrico) para cada espécie. Os resultados obtidos neste estudo sugerem que o C. jamacaru subsp. jamacaru e o P. pachycladus subsp. pernambucoensis são capazes de germinar em solos com baixa disponibilidade hídrica e que a redução dos níveis osmóticos das soluções de PEG 6000 no meio germinativo provoca decréscimos na viabilidade e vigor das sementes de mandacaru e facheiro. A 30 °C há menor tolerância das sementes ao estresse hídrico.

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“…Seed germination is a highly important stage in the life cycle of plants which may determine the success of the plant from the establishment to maturity 8 . This process is influenced by various environmental factors such as temperature 9 , drought 10 , salinity 11 , pH 12 , light 13 , burial depth 14 , etc.…”

Section: Introductionmentioning

confidence: 99%

No fitness cost associated with Asn-2041-Ile mutation in winter wild oat (Avena ludoviciana) seed germination under various environmental conditions

Hassanpour-bourkheili

Gherekhloo

Kamkar

et al. 2021

Sci Rep

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Knowledge about the fitness cost imposed by herbicide resistance in weeds is instrumental in devising integrated management methods. The present study investigated the germination response of ACCase-resistant (R) and susceptible (S) winter wild oat under different environmental conditions. The DNA of the plants was sequenced after being extracted and purified. The segregated F2 seeds were subjected to various temperatures, water potentials, NaCl concentrations, different pHs, darkness conditions, and burial depths. The results of the sequencing indicated that Ile-2041-Asn mutation is responsible for the evolution of resistance in the studied winter wild oat plants. The seeds were able to germinate over a wide range of temperatures, osmotic potentials, NaCl concentrations, and pHs. Germination percentage of R and S seeds under dark and light conditions was similar and ranged from 86.3 to 88.3%. The highest emergence percentage for both R and S plants was obtained in 0, 1, and 2 cm depths and ranged from 66.6 to 70.3%. In overall, no differences were observed in the germination response between the R and S winter wild oat plants under all studied conditions. No fitness cost at seed level indicates that control of R winter wild oats is more difficult, and it is essential to adopt crop and herbicide rotation to delay the further evolution of resistance.

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Effects of water deficit and pH on seed germination and seedling development in Cereus jamacaru

Cited by 8 publications

References 29 publications

Water restriction in seeds of Cereus jamacaru DC.

Water restriction in seeds of Cereus jamacaru DC.

Resposta germinativa de sementes de cactáceas colunares sob diferentes regimes de temperatura e de potencial hídrico

No fitness cost associated with Asn-2041-Ile mutation in winter wild oat (Avena ludoviciana) seed germination under various environmental conditions

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