scholarly journals Effects of water stress at different temperatures on germination of Bulnesia retama seeds (Gill. ex. Hook.) Griseb. -Zigofil醕eas- in San Luis, Argentina

Phyton ◽  
2007 ◽  
Vol 76 (1) ◽  
pp. 5-17
Author(s):  
Rodr韌uez Rivera M F ◽  
LR Sosa ◽  
EA Fern醤dez ◽  
M I Reale ◽  
V Villarreal
Keyword(s):  
Water Stress ◽  
San Luis ◽  
Different Temperatures ◽  
Bulnesia Retama

scholarly journals Water stress on germination and vigor of ‘mofumbo’ (Combretum leprosum Mart.) seeds at different temperatures

2020 ◽  
Vol 51 (1) ◽  
Author(s):  
Caio César Pereira Leal ◽  
Salvador Barros Torres ◽  
Nadjamara Bandeira de Lima Dantas ◽  
Gutierres Silva Medeiros Aquino ◽  
Tatianne Raianne Costa Alves
Keyword(s):  
Water Stress ◽  
Combretum Leprosum ◽  
Different Temperatures

scholarly journals Seeds of Caesalpinia echinata Lam. Under Water Stress at Different Temperatures

2020 ◽  
Vol 12 (7) ◽  
pp. 66
Author(s):  
Caroline Marques Rodrigues ◽  
Edna Ursulino Alves ◽  
Rosemere dos Santos Silva ◽  
Flávio Ricardo da Silva Cruz ◽  
Maria Lúcia Maurício da Silva ◽  
...  
Keyword(s):  
Water Stress ◽  
Economic Value ◽  
Seed Vigor ◽  
Large Tree ◽  
Randomized Design ◽  
Different Temperatures ◽  
C 30 ◽  
Caesalpinia Echinata ◽  
Polyethylene Glycol 6000 ◽  
Osmotic Potentials

The Caesalpinia echinata Lam. species, belongs to the Fabaceae family, popularly known as Pau Brazil, is a large tree, native to Brazil, that can be found from Ceará to Rio de Janeiro, with a relevant national historic and economic value. The objective of this study was to evaluate the effects of water stress at different temperatures on germination and seed vigor. The experiment was carried out at the Laboratório de Análise de Sementes of the Centro de Ciências Agrárias of the Universidade Federal da Paraíba, Areia-Paraíba. The water stress was formulated with solutions of polyethylene glycol 6000 (PEG 6000) in different osmotic potentials of 0.0 (control), -0.2; -0.4; -0.6 MPa at constant temperatures of 25, 30 and 35 °C, in a completely randomized design. The percentage of germination, first counting of germination, germination speed index, length and dry matter of seedlings were evaluated to determine the effects of the treatments. Decreases of the osmotic potential negatively influenced the germination and vigor of C. echinata seeds at the three evaluated temperatures (25 ºC, 30 ºC, 35 °C).

scholarly journals The effects of temperature on the dormancy and germination of Cirsium arvense (L.) Scop. seeds

2011 ◽  
Vol 78 (2) ◽  
pp. 105-114 ◽  
Author(s):  
Anna Bochenek ◽  
Janusz Gołaszewski ◽  
Agnieszka I. Piotrowicz-Cieślak ◽  
Ryszard J. Górecki
Keyword(s):  
Water Stress ◽  
Seed Dormancy ◽  
Cirsium Arvense ◽  
Model Parameters ◽  
Physiological Basis ◽  
Water Stress Tolerance ◽  
Different Temperatures ◽  
Average Water ◽  
Hydrotime Model ◽  
Fluctuating Temperatures

The ecophysiological regulation of seed dormancy in perennial species and those with a varied life cycle has not been studied in detail yet. That is why an attempt has been made to determine the <em>Cirsium arvense</em> seed water relations during stratification and afterripening at different temperatures and germination at constant or fluctuating temperatures on the basis of the hydrotime model. The obtained results showed that breaking of the primary dormancy of achenes took place only during the first stratification month at moderate temperatures, mainly due to an increase in the average water-stress tolerance in a seed population. The induction of secondary seed dormancy during after-ripening at all temperatures resulted mostly from a substantial loss of the seeds' ability to tolerate water stress. Fluctuating temperatures affected neither seed germination nor the hydrotime model parameters. The analysis of the variations of hydrotime model parameters allows a better understanding of the physiological basis of seed dormancy relief and induction.

scholarly journals Physiological potential of Phaseolus lunatus L. seeds subjected to water stress at different temperatures

2019 ◽  
Vol 40 (6Supl2) ◽  
pp. 2877
Author(s):  
Maria das Graças Rodrigues Nascimento ◽  
Maria Lúcia Maurício da Silva ◽  
Edna Ursulino Alves ◽  
Caroline Marques Rodrigues
Keyword(s):  
Water Stress ◽  
Primary Root ◽  
Dry Mass ◽  
Seed Vigor ◽  
Phaseolus Lunatus ◽  
Optimal Range ◽  
Peg 6000 ◽  
Different Temperatures ◽  
Polyethylene Glycol 6000 ◽  
Stress Simulation

Germination is negatively influenced by water scarcity and by temperatures above or below the optimal range of the species, so it is necessary to know the critical point of absorption for the species or cultivar. The objective of this work was to evaluate the effect of water stress, simulated by solutions of polyethylene glycol 6000 (PEG 6000) at different temperatures, on the germination and vigor of seeds of four cultivars (Branca, Orelha de Vó, Rosinha and Roxinha) of beans (Phaseolus lunatus L.). The water stress simulation was performed using PEG 6000 solutions at concentrations of 0.0, -0.2, -0.4, -0.6, -0.8, -1.0, and -1.2 MPa at temperatures of 25, 30, and 35 ° C. The analyzed variables were percentage of germination at first count, germination speed index, length of aerial part and primary root of seedlings, and dry mass of the respective parts of the seedlings. The seeds of the cultivar Orelha de Vó were more sensitive to water stress, with 88% germinating up to the potential of -0.6 MPa at the tested temperatures. The cultivars Branca, Rosinha, and Roxinha germinated (94, 100, and 100%, respectively) up to the potential of -0.8 MPa. Water stress simulated by PEG (6000) negatively affects seed twinning and seed vigor of bean cultivars.

Influence of Chilling and Drought on Water Relations and Abscisic Acid Accumulation in Bean

1991 ◽  
Vol 18 (1) ◽  
pp. 25 ◽  
Author(s):  
P Vernieri ◽  
A Pardossi ◽  
F Tognoni
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Water Relations ◽  
Cold Treatment ◽  
Relative Water ◽  
Different Temperatures ◽  
Saturated Atmosphere ◽  
Water Saturated ◽  
Aba Content ◽  
Chilling Treatment

Intact bean seedlings were subjected to either chilling (4°C) or drought stress. Leaf water relations and abscisic acid (ABA) content were monitored throughout a stress-recovery cycle. Chilling at low relative humidity (RH) and drought caused similar water deficits, as indicated by the decline in relative water content and water potentials, but they had different effects on ABA accumulation. There was a rapid increase in ABA levels in the leaves of water-deprived plants while only slight ABA accumulation was observed after 48 h of chilling (4°C). After 24 h cold treatment there were large changes in turgor but no change in ABA content. Plants chilled for 24 h accumulated ABA only when transferred to recovery conditions (20°C, 90-95% RH, in the dark) to an extent that was related to the rate of leaf rehydration. When the chilling treatment was performed in a water-saturated atmosphere, plants did not suffer any water stress and ABA levels did not increase over a period of 48 h. However, when the chilling treatment lasted for a longer period (72 h), a significant increase in ABA levels was found also in the absence of water deficit. Experiments performed with leaf discs incubated in a mannitol solution (osmotic potential - 1.6 MPa) at different temperatures indicated that low temperature markedly inhibits ABA synthesis and that water stress induces increases in ABA content only at non-limiting warm temperatures.

scholarly journals Water stress and temperature on germination and vigor of Handroanthus impetiginosus (Mart. ex DC)

2018 ◽  
Vol 22 (5) ◽  
pp. 349-354
Author(s):  
Paulo C. S. Santos ◽  
Clarisse P. Benedito ◽  
Tatianne R. C. Alves ◽  
Emanoela P. Paiva ◽  
Erivanessa C. Sousa ◽  
...  
Keyword(s):  
Water Stress ◽  
Seed Germination ◽  
Abiotic Factors ◽  
Primary Root ◽  
Seed Vigor ◽  
Physiological Processes ◽  
Different Temperatures ◽  
Osmotic Agent ◽  
Osmotic Agents ◽  
Osmotic Potentials

ABSTRACT Water availability and temperature are among the main abiotic factors that influence seed germination and vigor, since they act directly on biochemical and physiological processes, which result in the production of the primary root. The objective of this study was to verify the effects of stress on germination and vigor of H. impetiginosus (‘ipê-roxo’) seeds under different temperatures and osmotic agents. The experimental design was completely randomized, in a 6 x 2 factorial scheme (osmotic potentials x temperatures) with four replicates of 25 seeds for each osmotic agent. In order to simulate water stress, polyethylene glycol (PEG 6000) and mannitol solutions were used and distilled water was used as control. Osmotic potentials of 0, -0.2, -0.4, -0.6, -0.8 and -1.0 MPa were evaluated at temperatures of 25 and 30 °C, under 8 h photoperiod. The variables analyzed were: germination, germination speed index, shoot length, root length, and total dry matter of seedlings. Simulated water stress affected seed germination and seed vigor of H. impetiginosus at both temperatures and osmotic agents from -0.6 MPa.

scholarly journals Germination and initial development of Simira gardneriana seedling under water stress and at different temperatures

2017 ◽  
Vol 21 (5) ◽  
pp. 333-338 ◽  
Author(s):  
Fabrícia N. de Oliveira ◽  
Jessica R. de Oliveira ◽  
Salvador B. Torres ◽  
Rômulo M. O. de Freitas ◽  
Narjara W. Nogueira
Keyword(s):  
Water Stress ◽  
Water Availability ◽  
Dry Weight ◽  
Germination Percentage ◽  
Initial Development ◽  
Randomized Design ◽  
Seedling Length ◽  
Germination Speed ◽  
Different Temperatures ◽  
Completely Randomized Design

ABSTRACT The germination of seeds is affected by many factors, including water availability and temperature. This study aimed to evaluate the effects of water stress and different temperatures on germination and initial development of S. gardneriana M. R. Barbosa & Peixoto seedlings. The experiment was carried out in a completely randomized design, in a 7 x 4 factorial scheme, with seven potentials (0; -0.1; -0.2; -0.3; -0.4; -0.5 and - 0.6 MPa) and four temperatures (25, 30, 35 and 20-30 °C), with four replicates of 25 seeds. The analyzed variables were germination, percentage of normal seedlings, germination speed index, seedling length (shoot and root) and dry weight (shoot and root). There is a decrease in the germination and vigor of the seeds as the water potential decreases, being less affected under the temperature of 25 °C and very accelerated at 35 °C. The tolerance of S. gardneriana seed germination to water stress is variable between the temperatures and limiting to the formation of normal seedlings from the potential -0.5 MPa at temperatures of 25 to 30 °C and -0.4 and -0.2 MPa for 20-30 and 35 °C, respectively.

scholarly journals Germination and biochemical changes in West Indian gherkin seeds under water stress at different temperatures

2019 ◽  
Vol 50 (3) ◽  
Author(s):  
João Paulo Nobre de Almeida ◽  
Emanoela Pereira de Paiva ◽  
Salvador Barros Torres ◽  
Francisco Vanies da Silva Sá ◽  
Moadir de Sousa Leite
Keyword(s):  
Water Stress ◽  
West Indian ◽  
Biochemical Changes ◽  
Different Temperatures

scholarly journals ‘Jurema-de-embira’ seed germination under water stress and at different temperatures

2017 ◽  
Vol 21 (4) ◽  
pp. 244-248 ◽  
Author(s):  
Narjara W. Nogueira ◽  
Salvador B. Torres ◽  
Rômulo M. O. de Freitas ◽  
Thiago H. da S. Castro ◽  
Francisco V. da S. Sá
Keyword(s):  
Water Stress ◽  
Germination Percentage ◽  
Water Retention Capacity ◽  
Total Biomass ◽  
Retention Capacity ◽  
Water Imbibition ◽  
Germination Process ◽  
Dry Biomass ◽  
Different Temperatures ◽  
Osmotic Potentials

ABSTRACT The process of water imbibition by the seed depends on temperature and water availability, which according to the absorbed water retention capacity will determine the success of the germination process. Thus, this study aimed to investigate the effects of water stress on the germination and vigor of ‘jurema-de-embira’ seeds under different temperatures. The experimental design was completely randomized in a 7 x 4 factorial scheme (osmotic potential and temperature) with four replicates of 25 seeds each. The osmotic potentials of 0, -0.1, -0.2, -0.3, -0.4, -0.5 and -0.6 MPa at temperatures of 25, 30 and 35 °C and alternated of 20-30 °C, under photoperiod of 8 h, were evaluated. Germination percentage, germination speed index, shoot and root length, shoot dry biomass, root dry biomass and total biomass were evaluated. Water stress negatively affected the germination and vigor of ‘jurema-de-embira’ seedlings from the potential of -0.2 MPa on, whose effects are more evident at the temperature of 35 ° C. The alternated temperature of 20-30 °C allowed greater tolerance to water stress for the germination of ‘jurema-de-embira’ seeds.

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