scholarly journals Fiber flax germination at different temperatures and salinity stress conditions

Sjemenarstvo ◽  
2021 ◽  
Vol 31 (1-2) ◽  
pp. 13-20
Author(s):  
Ivana Varga ◽  
Manda Antunović ◽  
Mirta Rastija ◽  
Dario Iljkić ◽  
Monika Tkalec Kojić
Keyword(s):  
Salinity Stress ◽  
Water Solution ◽  
Germination Rate ◽  
Negative Influence ◽  
Fiber Flax ◽  
Germination Energy ◽  
Different Temperatures ◽  
Set Up ◽  
Lower Temperature ◽  
Flax Cultivar

In this study the fiber flax (Linum usitassimum L.) cultivar Lirina was tested to seed germination under salinity of NaCl and two different temperatures. The experiment was set up in controlled conditions in fitotron (Aralab). There were two temperatures (10°C and 20°C) and different NaCl water solution used for salinity stress: 0 mM, 20 mM, 40 mM, 60 mM, 80 mM and 100 mM. There were 100 seeds sown in 4 replications. The germination energy (%) and germination rate (%) were determined on 3rd and 7th day, respectively. At the lower temperature (10°C) the seeds were not sprouted on 3rd day, whereas at higher temperature (20°C) mean germination energy was 31%. Germination rate (7th day) was quite similar at both temperatures (58% at 10°C and 59% at 20°C). The higher salinity stress of 80 and 100 mM had negative influence on germination energy as well germination rate. With increased salinity, the total seedlings length was also decreased. With increasing salinity (over 20 mM), the total seedlings length was also decreased. In out study, low salinity stress of 20 mM even increases the germination rate and germination energy and resulted with the longest seedlings of the fiber flax cultivar Lirina.

scholarly journals GENETIC EVALUATION OF SEED GERMINATION AND DEVELOPMENT OF SEEDLINGS IN Ormosia excelsa Benth

FLORESTA ◽  
2018 ◽  
Vol 48 (3) ◽  
pp. 331
Author(s):  
Jennifer Souza Tomaz ◽  
Maria Teresa Gomes Lopes ◽  
Mágno Sávio Ferreira Valente ◽  
Manuel De Jesus Vieira Lima Júnior ◽  
Graciela Inês Bolzón de Muniz ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Selection Process ◽  
Germination Rate ◽  
Different Temperatures ◽  
High Heritability ◽  
Mean Germination Time ◽  
Number Of Leaves ◽  
Set Up ◽  
Germination Traits ◽  
Selection Of

The aim of this study was to estimate the genetic parameters of Ormosia excelsa seeds based on germination traits, at different temperatures, in order to facilitate the selection of superior varieties of seeds for producing seedlings. Twenty six progenies collected in the municipality of Autazes (state of Amazonas, Brazil) were evaluated. The experiment was completely randomized, with four replications and 25 seeds per plot, totaling 100 seeds per progeny. The germination rate, mean germination time and the synchronization and speed germination indexes were determined at the temperatures of 30 and 35 °C. Seedling development was also evaluated under nursery conditions. The progenies of O. excelsa showed significant genetic variability for all traits. Both temperatures proved to be effective in producing germination close to 87%. Germination began between 1 and 4 days after sowing. However, for greater efficiency in the selection of superior progenies, each environment should be considered individually. The high heritability values obtained (> 65%) and the high genetic correlation favorable for selection, among all traits, resulted in significant gains according to the selection process used. Our results indicated that determining superior progenies for height and number of leaves was possible based on a single evaluation. The fact that 100% of seedlings planted in the field survived promotes a promising outlook to set up commercial nurseries for the species.

scholarly journals Seed Germination of Some Flower Species Under Influence of Different Light Conditions

2017 ◽  
Vol 17 (2) ◽  
pp. 183
Author(s):  
Monika Tkalec ◽  
Тijana Mirković ◽  
Mario Mitrović ◽  
Nada Parađiković ◽  
Jasna Kraljičak ◽  
...  
Keyword(s):  
Seed Germination ◽  
Blue Light ◽  
White Light ◽  
Germination Rate ◽  
Dianthus Caryophyllus ◽  
Light Conditions ◽  
Germination Energy ◽  
Significant Difference ◽  
Set Up ◽  
Local Store

The aim of this study was to examine germination energy and seed germination rate of some flower species under influence of different light conditions. Seeds of Zinnia elegans Jacq., Dianthus caryophyllus L. and Callistephus chinensis (L.) Nees that were used in the research were purchased in local store. Experiment was set up in three replicates for each light treatment and each flower species. Petri dishes with seeds were placed in growth chamber under artificial white and blue light under 12hL/12hD photoperiod. Results showed no significant difference in germination energy and total germination of investigated flower species in respect of light. Zinnia seedlings were significantly longer on white light, while Dianthus seedlings were longer on blue light. Both, length and fresh weight of Callistephus seedlings were greater on white light. The absence of significant differences between measured parameters under examined light regimes suggests that germination of Zinnia, Dianthus and Callistephus is not photosensitive.

scholarly journals Seedlings morphology of confectionery sunflower at different pH of water solution

Sjemenarstvo ◽  
2021 ◽  
Vol 31 (1-2) ◽  
pp. 21-28
Author(s):  
Ivana Varga ◽  
Manda Antunović ◽  
Tsvetelina Dobreva ◽  
Dario Iljkić ◽  
Jasna Šoštarić
Keyword(s):  
Room Temperature ◽  
Water Solution ◽  
Germination Rate ◽  
Positive Influence ◽  
Alkaline Media ◽  
Acid Media ◽  
Total Length ◽  
The Mean ◽  
Set Up ◽  
Influence Of Ph

In this study the confectionery sunflower seed was tested to germination at different pH media, from 3.5 to 8.5. The experiment was set up at room temperature (22°C) and at 24 h dark conditions for 10 days. The mean germination rate was 76%. The highest germination rate was 86% at pH 3.5, whereas the lowest was 68% at pH 5.5. The ANOVA resulted with very significant influence of pH on sunflower seedlings root, stem and total length (p<0.001). The total length of seedlings was the shortest at acid media (9.2 cm at 3.5) and the longest at alkaline media (12.5 cm at pH 8.5). Regression equitations showed that increment of stem or root length and total length have a positive trendline at all pH levels. It was found that the alkaline water solution has a positive influence on protein sunflower seedlings development, but it would be valuable to found how the seeds would germinate at the field conditions.

scholarly journals Germination and seedlings growth of domestic poppy (Papaver somniferum L.) regarding salinity and temperatures

2021 ◽  
Vol 82 (4) ◽  
pp. 157-172
Author(s):  
Ivana Varga ◽  
Manda Antunović ◽  
Dario Iljkić ◽  
Milan Pospišil ◽  
Mirta Rastija
Keyword(s):  
Water Solution ◽  
Germination Rate ◽  
Papaver Somniferum ◽  
Stem Length ◽  
Total Length ◽  
Germination Energy ◽  
Poppy Seeds ◽  
The Difference ◽  
Plant Growth Chamber ◽  
Germinated Seeds

In this research there were studied the effects of NaCl-induced salinity and environment temperatures on germination and seedlings growth of domestic poppy. The study was conducted in the controlled conditions in the plant growth chamber. There were applied different concentrations of NaCl (0 mM (control), 50 mM, 100 mM and 150 mM) and environment temperatures (10°C, 15°C and 20°C). The 50 seeds of domestic poppy cultivar (Detkovac) were sown in 4 replicates on the filter paper. The germination energy was determined on the 5th day and total germination rate and seedlings morphological characteristic were determined on the 10th day. At the 5th day germination energy was on average 28%. It was interesting to note that at the 10°C there were no germinated seeds after 5 days at all salinity treatments and also, at the salinity level of 150 mM NaCl at every temperature. The average germination rate (on 10th day) of domestic poppy seeds were 52% and it varied from 30% (150 mM NaCl and 20°C) to 90% (0 mM NaCl and 15°C). Different salinity of water solution had a very significant (p<0.01) influence on stem, root and total length (cm) of seedlings. The average root length was 1.3 cm and it varied from 0.9 cm (100 mM NaCl) to 1.8 cm (0 NaCl). The average stem length was 1.8 cm. The longest stem was found at control (2.7 cm), and between 50 and 100 mM of NaCl the difference was not significant and stem length averaged 1.4 to 1.3 cm depending on the temperature. Average total poppy seedlings length of this study was 3.0 cm and it varied from 4.5 cm at the control to 2.3 cm at 100 mM NaCl. With regard to temperatures, there was no significant differences found in root and total length of poppy seedlings, but the differences were very significant (p<0.01) for stem length. The longest poppy seedlings were measured at 20°C and 0 mM NaCl (4.9 cm), while at 10°C and at 0 or 50 mM NaCl, seedlings were less than 0.1 cm. Seeds were not germinating at all on 10°C on both, 100 and 150 mM NaCl. Generally, salinity reduced germination energy and germination rate and seedlings length. Results may indicate that seeds are mainly affected by osmotic stress and therefore it is not recommended to cultivate poppies on soils with excess salts

Influence of Heat on Seed Germination of Cistus Laurifolius and Cistus Ladanifer

1992 ◽  
Vol 2 (1) ◽  
pp. 15 ◽  
Author(s):  
L Valbuena ◽  
R Tarrega ◽  
E Luis
Keyword(s):  
Seed Germination ◽  
High Temperatures ◽  
Exposure Time ◽  
Germination Rate ◽  
Heat Exposure ◽  
Cistus Ladanifer ◽  
Different Temperatures ◽  
Petri Dishes ◽  
Germinated Seeds

The influence of high temperatures on germination of Cistus laurifolius and Cistus ladanifer seeds was analyzed. Seeds were subjected to different temperatures for different times, afterwards they were sowed in plastic petri dishes and monitored for germinated seeds over two months.The germination rate observed in Cistus ldanifer was greater than in Cistus laurifolius. In both species, heat increased germination percentages. For Cistus laurifolius higher temperatures or longer exposure times were needed. Germination percentages of Cistus ladanifer were lower when heat exposure time was 15 minutes.It must be emphasized that germination occurred when seeds were not treated, while seeds exposed to 150�C for 5 minutes or more did not germinate.

Temperature Effect on Seed Germination Performance of a Local Variety of Onion in Bangladesh

2021 ◽  
Vol 1 (01) ◽  
pp. 27-30
Author(s):  
IRANI KHATUN ◽  
RIYAD HOSSEN
Keyword(s):  
Seed Germination ◽  
Temperature Effect ◽  
Performance Test ◽  
Germination Rate ◽  
Germination Percentage ◽  
Optimum Range ◽  
Local Variety ◽  
Different Temperatures ◽  
Local Farmers

Seed germination performance test of Taherpuri onion (a local variety of onion) under six different temperatures (15, 20, 25, 30, 35 and 40°C) was the main goal of this experiment. Germination percentage (GP) was calculated at highest 60.25% at 25°C, and the highest germination rate 20.08 was observed in the same temperature condition. The lowest germination performance (13.25 % germi-nation and 3.32 seeds per day as germination rate) was found at 40°C temperature. Finally, the authors mentioned the temperature 20 to 30°C as optimum range, and suggested the temperature 25°C as best suited for obtaining highest results in case of both germination percentage and germination rate of these seeds. To produce maximum seedlings of the local variety of onion, the mentioned temperature should be followed by the local farmers.

scholarly journals Acid and Temperature Treatments Result in Increased Germination of Seeds of Three Fescue Species

2012 ◽  
Vol 40 (2) ◽  
pp. 220 ◽  
Author(s):  
Rade S. STANISAVLJEVIC ◽  
Savo M. VUCKOVIC ◽  
Aleksandar S. SIMIC ◽  
Jordan P. MARKOVIC ◽  
Zelijco P. LAKIC ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Seed Germination ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Germination Rate ◽  
Festuca Rubra ◽  
Time Intervals ◽  
Different Temperatures ◽  
Successful Establishment ◽  
Seed Collecting

Efficient germination of fescue seeds is essential for successful establishment of meadows and pastures. This research was conducted to ascertain the effects of various acid and temperature treatments on seed germination in three fescue species: Festuca rubra, F. ovina, and F. pratensis. Seeds from different cultivars, populations, or lots were exposed either to four concentrations of sulfuric acid at three different time intervals (12 treatments) or six different temperatures at three different time intervals (18 treatments). Despite all belonging to the genus Festuca, the seed from different species responded differently to the treatments. The three optimum treatments for F. rubra seed involved soaking in a 75% solution of sulfuric acid for 20 minutes (improved the germination rate by 19%), soaking in a 50% solution of sulfuric acid for 30 minutes (improved the germination rate by 18%) and exposure to either 60°C or 70°C for 90 minutes (improved the germination rate by 17%). For F. ovina seed, optimal treatments included soaking seeds for either 10 or 20 minutes in a 50% sulfuric acid solution (both treatments improved germination rates by 13%) or exposing seeds for 30 minutes in a 25% sulfuric acid solution and 80°C for 60 minutes (improved germination rate by 12%). Two optimal treatments were identified for F. pratensis seed. Whereas the first involved soaking the seeds in a 75% sulfuric acid solution for 30 minutes (improved germination rates by 22%), the second involved either exposing the seeds to 90°C for 90 or 60 minutes, or exposing the seeds to 80°C for 90 minutes (improved germination rate by 21%). Our findings indicate that if fescue seed is to be sown during the autumn (two to three months after seed collecting), treating it with acid and temperature can significantly enhance its germination.

scholarly journals Effects of light intensity and temperature on Cylindrospermopsis raciborskii (Cyanobacteria) with straight and coiled trichomes: growth rate and morphology

2012 ◽  
Vol 72 (2) ◽  
pp. 343-351 ◽  
Author(s):  
MC. Bittencourt-Oliveira ◽  
B. Buch ◽  
TC. Hereman ◽  
JDT. Arruda-Neto ◽  
AN. Moura ◽  
...  
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Morphological Changes ◽  
Population Control ◽  
Distinct Species ◽  
Cylindrospermopsis Raciborskii ◽  
Climatic Chamber ◽  
Light Intensities ◽  
Different Temperatures ◽  
Lower Temperature

Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju (Ordem Nostocales) is one of the most troublesome bloom-forming species in Brazil. Understanding the population dynamics of the different morphotypes of C. raciborskii (straight and coiled) could assist in the prediction of favourable conditions for the proliferation of this potentially toxin-producing species. The aim of the present study was to assess the effects of two different light intensities and temperatures on the growth rate and morphology of the trichomes of the straight and coiled morphotypes. For such, two non-toxin producing strains of C. raciborskii were used - one with a coiled trichome (ITEP31) and another with a straight trichome (ITEP28). The strains were cultured in BG-11 medium in a climatic chamber under controlled conditions. Two light intensities (30 and 90 µmol.m-2.s-1 ) were combined at temperatures of 21 and 31 °C and the growth rate and morphological changes were analysed. The morphotypes responded differently to the different temperatures and light intensities. Both strains exhibited faster growth velocities when submitted to higher light intensity and temperature. The lower temperature and higher luminosity hampered the development of both strains. Variations in cellular morphology and an absence of akinetes in both strains were related to the lower temperature (21 °C). The coiled morphotype demonstrated considerable phenotype plasticity, changing the morphology of trichome throughout its growth curve. Although molecular analysis does not sustain the separation of the morphotypes as distinct species, their different eco-physiological responses should be considered further knowledge of extreme importance for the population control of these potentially toxic organisms.

scholarly journals Creep behaviour and life assessment of a cast nickel – base superalloy MAR – M247

2019 ◽  
Vol 38 (2019) ◽  
pp. 590-600
Author(s):  
Marie Kvapilova ◽  
Jiri Dvorak ◽  
Petr Kral ◽  
Karel Hrbacek ◽  
Vaclav Sklenicka
Keyword(s):  
Creep Behaviour ◽  
Life Assessment ◽  
Dislocation Creep ◽  
Nickel Base Superalloy ◽  
Creep Characteristics ◽  
Different Temperatures ◽  
High Temperature Components ◽  
Lower Temperature ◽  
Nickel Base ◽  
Different Grain Size

AbstractThe cast nickel-base MAR-M247 superalloy has been widely used for high-temperature components. In this work, the creep behaviour of two alternates of MAR-M247 superalloy with different grain size processed at different temperatures of casting are compared. Under the creep testing conditions used in this study, only negligible differences of creep behaviour of the alternate alloys were found and the evaluated creep characteristics correspond to the power-law or dislocation creep. The microstructure of the alloys consists of a𝛾matrix with a eutectic,𝛾'strengthening cubic precipitates, and M6C and M23C6carbides. Increasing the temperature induces the dissolution of some M23C6carbides. Fractures of both variants of alloys exhibit a more ductile character at higher temperatures, while at lower temperature a mixture of brittle and ductile fracture modes was observed, which changes the creep fracture ductility.

Sign in / Sign up

Export Citation Format

Share Document