scholarly journals Phytochrome and temperature control of seed germination in Muntingia calabura L. (Elaeocarpaceae)

2001 ◽  
Vol 44 (3) ◽  
pp. 297-302 ◽  
Author(s):  
Idalina T. de A. Leite ◽  
Massanori Takaki
Keyword(s):  
Seed Germination ◽  
Temperature Control ◽  
White Light ◽  
Pioneer Species ◽  
Optimum Temperature ◽  
Response Curves ◽  
Temperature Range ◽  
Short Period ◽  
Muntingia Calabura

The temperature range of germination of seeds of Muntingia calabura L. was 15-35° C and the optimum temperature at 35° C where more seeds germinated at short period. The fluence response curves demonstrated the involvement of phytochrome in the control of germination through the low fluence response. The effect of photoperiod showed that the species need long daily exposures to white light and that shade light inhibited completely seed germination, confirming as pioneer species that colonized only large gaps in the forest.

scholarly journals Effect of light and temperature on seed germination in Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae)

2008 ◽  
Vol 8 (2) ◽  
pp. 63-68 ◽  
Author(s):  
Edson Simão ◽  
Massanori Takaki
Keyword(s):  
Seed Germination ◽  
White Light ◽  
Light Sensitivity ◽  
Pioneer Species ◽  
Continuous Darkness ◽  
Effect Of Light

The effect of light and temperature on Tibouchina mutabilis seed germination was analyzed by isothermic incubations in the range of 10 to 40 °C, with 5 °C intervals under both continuous white light (32.85 µmolm-2s-1) and darkness and alternating temperatures (15-20; 15-25; 15-30; 15-35; 20-25; 20-30; 20-35; 25-30; 25-35 and 30-35 °C) under both photoperiod of 12 hours and continuous darkness. The seeds of T. mutabilis need light to trigger the germination and no germination was observed in darkness. The range of optimum temperatures for germination was between 25 to 30 °C and the 20-25 °C alternating temperatures. These results indicate that T. mutabilis behaves as a pioneer species and daily alternating temperatures did not change the light sensitivity of seeds.

scholarly journals Temperature Dependent Seed Germination of Dalbergia nigra Allem (Leguminosae)

2001 ◽  
Vol 44 (4) ◽  
pp. 401-404 ◽  
Author(s):  
Fernanda G. A. Ferraz-Grande ◽  
Massanori Takaki
Keyword(s):  
Seed Germination ◽  
Endangered Species ◽  
High Temperatures ◽  
Broad Temperature Range ◽  
Optimum Temperature ◽  
Temperature Dependent ◽  
Temperature Range ◽  
Dalbergia Nigra ◽  
The Mean ◽  
Kinetics Of

The germination of endangered species Dalbergia nigra was studied and 30.5° C was found as optimum temperature, although the species presented a broad temperature range where germination occurs and light had no effect. The analysis of kinetics of seed germination confirmed the asynchronized germination below and above the optimum temperature. The light insensitive seed and germination also at high temperatures indicated that D. nigra could occur both in understories and gaps where the mean temperature was high.

scholarly journals Seed germination in Miconia theaezans (Bonpl.) Cogniaux (Melastomataceae)

2007 ◽  
Vol 50 (4) ◽  
pp. 571-578 ◽  
Author(s):  
Simone Godoi ◽  
Massanori Takaki
Keyword(s):  
Seed Germination ◽  
White Light ◽  
Diffusion Processes ◽  
Light Irradiation ◽  
Optimum Temperature ◽  
Strong Light ◽  
Maximum Induction ◽  
Successional Species ◽  
Maximum Temperatures ◽  
Alternating Temperature

The effects of light and temperature were studied on the seeds of Miconia theazeans by isothermic and alternating temperature incubations. The optimum temperature for seed germination was determined by final percentage and germination rates as located in the range of 27.5 to 30 °C and by germination kinetics at the range of 19.5 to 30 °C. The germination was dependent on diffusion processes. The minimum and maximum temperatures were 12.5-15°C and 32.5-35°C, respectively. The seeds showed strong light dependence for germination with the necessity of daily 4-6 h white light irradiation for the maximum induction of germination. However, under 30-20 °C alternating temperatures, daily 2 hours white light was enough to induce germination and attained maximum under 4 h photoperiod. The results indicated that M. theazeans presented characteristics of early successional species.

scholarly journals Interaction of temperature and light on seed germination in Tecoma stans L. Juss. ex Kunth (Bignoniaceae)

2008 ◽  
Vol 51 (4) ◽  
pp. 523-530 ◽  
Author(s):  
Fábio Socolowski ◽  
Daniela Cristine Mascia Vieira ◽  
Massanori Takaki
Keyword(s):  
Seed Germination ◽  
White Light ◽  
Seedling Recruitment ◽  
Optimum Temperature ◽  
Light Conditions ◽  
Optimal Temperature ◽  
Direct Sunlight ◽  
Invasion Potential ◽  
Seeds Germination

The effects of the temperature and light on the control of seeds germination in Tecoma stans was studied in the present work. The influence of constant temperatures from 10 to 45ºC, with 5ºC intervals, under the white light and darkness were tested. The optimum temperature for the germination of the seeds was between 25 and 30ºC, for both the light and the dark treatments. The maximal germination was reached in the range of 15 to 35ºC under the light and of 20 to 40ºC in the darkness. The seeds showed highest synchronization of the germination near the optimal temperature. The germination in the field was tested under the two light conditions. The highest percent of germination occurred under the direct sunlight (86.1%) than under the canopy (69%). However, under the canopy, the seedling presented 1.5% of the recruitment, while under the direct sunlight, 96.9 %. Results showed that T. stans seeds germinated well in the open areas with the occurrence of high seedling recruitment indicating the invasion potential of the species in such light conditions.

scholarly journals Relationships between substrate and the mobilization of reserve with temperature during seed germination of Ormosia coarctata Jack.

2020 ◽  
Vol 42 ◽  
Author(s):  
Luciane Pereira Reis ◽  
Eduardo Euclydes de Lima e Borges ◽  
Genaina Aparecida de Souza ◽  
Danielle S. Brito
Keyword(s):  
Seed Germination ◽  
Biodiversity Conservation ◽  
Ecological Restoration ◽  
Soluble Sugars ◽  
Soluble Proteins ◽  
Optimum Temperature ◽  
Essential Information ◽  
Temperature Range ◽  
Different Temperatures ◽  
The Relationship

Abstract: Seed germination studies provide essential information for biodiversity conservation and ecological restoration programs. This work aimed to investigate the relationship between the substrates and the mobilization of reserves during germination of Ormosia coarctata seeds under different temperatures. Samples were collected every 48 h for up to 240 h for quantification of lipids, soluble sugars, starch, and soluble proteins. The optimum temperature range for germination was 25 to 35 °C. The highest germination percentages were obtained using sand or paper roll. Carbohydrate, lipid, and protein contents decreased during germination, regardless of temperature.

Glycogenolytic Enzymes of Cod (Gadus callarias) Muscle

1966 ◽  
Vol 23 (4) ◽  
pp. 527-538 ◽  
Author(s):  
J. R. Burt
Keyword(s):  
Muscle Glycogen ◽  
Maximum Activity ◽  
Chloride Ions ◽  
Relative Importance ◽  
Optimum Temperature ◽  
Short Period ◽  
Wide Range

Some properties of the enzymes amylase, phosphorylase, and phosphoglucomutase in homogenates of cod muscle have been investigated. Amylase is activated by a short period of autolysis and by chloride ions; hydrolyses cod muscle glycogen at about half the rate it hydrolyses mussel glycogen; has an optimum temperature of 52 C for up to 5 hr incubation; and has a wide range of activity with maxima around pH 5.1 and between pH. 7.0 and 7.5. Using phloridzin, an estimate of the relative importance of hydrolytic and phosphorolytic cleavage of polysaccharide in cod muscle homogenates has been made. Phosphorylase shows two activity maxima at pH 5.5 and 6.7. The properties of phosphoglucomutase, with the exception of its pH activity, in cod muscle are similar to those reported for this enzyme in other tissues. Cod muscle phosphoglucomutase has maximum activity between pH 8 and 9.

Optimum temperature range for the proton dynamics in H-doped BaZrO3:Yb dense ceramics—a neutron scattering study

2012 ◽  
Vol 27 (15) ◽  
pp. 1939-1949 ◽  
Author(s):  
Aneta Slodczyk ◽  
Philippe Colomban ◽  
Daniel Lamago ◽  
Gilles André ◽  
Oumaya Zaafrani ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Optimum Temperature ◽  
Temperature Range ◽  
Scattering Study ◽  
Proton Dynamics ◽  
Neutron Scattering Study ◽  
Image Position

Abstract

scholarly journals Response of Lupinus bracteolaris seeds to pre-germinative treatments and experimental conditions

2021 ◽  
Vol 12 (2) ◽  
pp. 51-66
Author(s):  
Luciana Pinto Paim ◽  
Eduarda Demari Avrella ◽  
Juliana Carolina Alves Horlle ◽  
Claudimar Sidnei Fior ◽  
Marília Lazarotto ◽  
...  
Keyword(s):  
Seed Germination ◽  
Substrate Temperature ◽  
Water Intake ◽  
White Light ◽  
Green Light ◽  
Experimental Conditions ◽  
Germination Time ◽  
Randomized Design ◽  
Germination Speed ◽  
Completely Randomized Design

Contextualization: Lupinus bracteolaris is a heliophite species that vegetates low lands, open slopes and sandstone hills. Knowledge gap: Despite the high rusticity and potential for covering poor soils, there is still no information to assist in the analysis of its seeds. Purpose: To determine pre-germinative treatments, substrate, temperature, luminosity and water intake in the vigor of Lupinus bracteolaris seeds. Methodology: Fruits were collected from 20 matrix plants, then the seeds were processed and submitted to the following tests: pre-germinative methods (six treatments at 25°C); substrates and temperatures (sand and paper at 20, 25 and 30°C); photoblast test (white light, diffuse-green light and continuous dark under 20°C) and the imbibition curve (control and scarification between sandpaper under 20°C). Evaluations: percentage of germination and formed seedlings, germination speed index, average germination time and seedling formation, using a completely randomized design. Results and conclusions: According to the analyzed variables, the results showed superiority for the pre-germinative treatment between sandpapers for 20 seconds. In addition, the substrate paper germibox and the temperature of 20°C were the most suitable during seed germination. The seeds of Lupinus bracteolaris were classified as neutral-photoblastic and without dormancy.

scholarly journals Effect of NaCl on seed germination in some Centaurium Hill. Species (Gentianaceae)

2007 ◽  
Vol 59 (3) ◽  
pp. 227-231 ◽  
Author(s):  
S. Zivkovic ◽  
M. Devic ◽  
B. Filipovic ◽  
Z. Giba ◽  
D. Grubisic
Keyword(s):  
Life History ◽  
Salt Tolerance ◽  
Seed Germination ◽  
Gibberellic Acid ◽  
White Light ◽  
The Other ◽  
Distilled Water ◽  
Nacl Concentration ◽  
History Of ◽  
Species Specific

The influence of high NaCl concentrations on seed germination in both light and darkness was examined in the species Centaurium pulchellum, C. erythraea, C. littorale, C. spicatum, and C. tenuiflorum. Salt tolerance was found to depend on the life history of the seeds. To be specific, seeds of all five species failed to complete germination when exposed to continuous white light if kept all the time in the presence of 100-200 mM and greater NaCl concentrations. However, when after two weeks NaCl was rinsed from the seeds and the seeds were left in distilled water under white light for an additional two weeks, all species completed germination to a certain extent. The percent of germination not only depended on NaCl concentration in the prior medium, but was also species specific. Thus, seeds of C. pulchellum, C. erythraea, and C. littorale completed germination well almost irrespective of the salt concentration previously experienced. On the other hand, seeds of C. tenuiflorum completed germination poorly if NaCl concentrations in the prior media were greater than 200 mM. When seeds after washing were transferred to darkness for an additional 14 days, they failed to complete germination if previously imbibed on media containing NaCl concentrations greater than 400 mM. However, the seeds of all species, even if previously imbibed at 800 mM NaCl, could be induced to complete germination in darkness by 1 mM gibberellic acid. .

scholarly journals Biology and survival of broom corn millet (Panicum miliaceum) seed

2011 ◽  
Vol 64 ◽  
pp. 142-148 ◽  
Author(s):  
T.K. James ◽  
A. Rahman ◽  
C.R. McGill ◽  
P.D. Trivedi
Keyword(s):  
Zea Mays ◽  
New Zealand ◽  
Seed Germination ◽  
Sweet Corn ◽  
Management Control ◽  
Panicum Miliaceum ◽  
Wild Type ◽  
Temperature Range ◽  
Control Options ◽  
Millet Seed

The wild type of broom corn millet (Panicum miliaceum) is a serious emerging weed currently prevalent in New Zealand sweet corn (Zea mays) crops This study shows its seed is nearly twice the weight of other common grass weeds and can germinate in the temperature range 1634C with 50 germination at 26C and greatest germination occurring at 31C At 15C it took 8 days for seedlings to emerge but required only 4 days at 25C Seed was able to emerge from depths of up to 170 mm in a range of soils Experiments showed that broom corn millet seed can persist in the soil for longer than 2 years in the field but is killed in silage stack and bales Immersion in stock effluent for up to three months reduced seed germination to less than 40 These characteristics are discussed in relation to herbicide and management control options for this weed

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