O Aumento da Temperatura Reduz a Tolerância ao Estresse Hídrico na Germinação de Sementes de Pereskia grandifolia Haw. subsp. grandifolia (Cactaceae)?

Oliveira, Daianne Maria de; Lima, Ayslan Trindade; Rocha, Emerson Antônio; Meiado, Marcos Vinícius

doi:10.22478/ufpb.1981-1268.2017v11n4.35466

Cited by 9 publications

(9 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, in the species where the effect of water potential and temperature has been combined, normally at 25 °C, better results have been obtained than at temperatures of 30 °C or higher (Oliveira et al 2017. For primarily arid and semiarid species with small seeds, as occurs in Cactaceae, the preference for germinating in humid soil can be an advantage that permits to reduce seedling mortality when faced with transient rain followed by prolonged droughts.…”

Section: Seed Dormancy Rojas-aréchiga and Vázquez-yanesmentioning

confidence: 99%

Seed traits and germination in the Cactaceae family: A review across Americas

Barrios¹,

Sánchez²,

Flores³

et al. 2020

Bot. Sci.

View full text Add to dashboard Cite

Background: Cactaceae is the fifth taxonomic group with the highest proportion of threatened species and among the angiosperms, the most vulnerable to human disturbance. One way to contribute to the preservation of this family is to understand the processes that promote seed germination. Questions: Have the relationship between seed traits and cactus germination been documented? How common is dormancy and seed banks in Cactaceae? Are there general patterns in cacti germination response to temperature, light, water, salinity, phytohormones, hydration/dehydration cycles, mechanical or chemical scarification? Data description: A total of 333 studies on cactus germination with information on 409 taxa. Study site and dates: since 1939 to January 2020. Methods: A search of scientific articles in Google Scholar was performed with the words Cactaceae, cacti and cactus, in combination with various matters on germination in English, Spanish and Portuguese. Results: The main germination studies in cactus deal with photoblasticism (275 taxa), temperature (205 taxa) and seed longevity (142 taxa). Other lines of study in cactus germination (e.g., desiccation tolerance, vivipary, phytohormones, mechanical or chemical scarification, in vitro germination, hydration/dehydration cycles, water and saline stress, serotiny, storage in cold, high temperature tolerance and soil seed bank) include between 14 and 65 taxa. Cacti have only physiological dormancy and optimal germination for most species occur between 20 and 30 °C. Photoblasticism is strongly influenced by phylogeny with 80.9 % positive photoblastic species. Conclusions: Mexico, Brazil and Argentina are the three leading countries in the study of cactus germination.

show abstract

Section: Seed Dormancy Rojas-aréchiga and Vázquez-yanesmentioning

confidence: 99%

Seed traits and germination in the Cactaceae family: A review across Americas

Barrios¹,

Sánchez²,

Flores³

et al. 2020

Bot. Sci.

View full text Add to dashboard Cite

show abstract

“…During the evaluation of whether increased temperature reduces water stress tolerance in the germination of Pereskia grandifolia Haw. (Cactaceae) seeds while using polyethylene glycol (PEG 6000) to simulate the water deficit, Oliveira et al (2017) found a decrease in seed germination rate with the osmotic potential reduction, regardless of the evaluated temperature. However, the increased temperature reduced the water stress tolerance in the germination of P. grandifolia seeds.…”

Section: Resultsmentioning

confidence: 94%

Water restriction in seeds of Cereus jamacaru DC.

Silva

Azerêdo

Ferreira

et al. 2021

Agraria

View full text Add to dashboard Cite

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.

show abstract

“…Irwin & Barneby (Fabaceae) . Each species germinates at a specific critical osmotic potential (Oliveira et al 2017). In addition, the environmental conditions from which the seeds were produced may influence the physiological responses to the abiotic conditions present during the germination of these seeds (Lima and Meiado 2017).…”

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

O Aumento da Temperatura Reduz a Tolerância ao Estresse Hídrico na Germinação de Sementes de Pereskia grandifolia Haw. subsp. grandifolia (Cactaceae)?

Cited by 9 publications

References 12 publications

Seed traits and germination in the Cactaceae family: A review across Americas

Seed traits and germination in the Cactaceae family: A review across Americas

Water restriction in seeds of Cereus jamacaru DC.

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

Contact Info

Product

Resources

About