scholarly journals Morphometry and Germination of Passovia pyrifolia, Struthanthus marginatus and Phoradendron mucronatum Diaspores

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
J.M.L. AZEVEDO ◽  
C.G.G. SANTOS ◽  
C.S. CAIRES ◽  
J.C. ARAÚJO NETO ◽  
R.C. SOUZA
Keyword(s):  
Moisture Content ◽  
Germination Rate ◽  
Germination Percentage ◽  
Percentage Germination ◽  
Essential Characteristic ◽  
Germination Time ◽  
Randomized Design ◽  
Different Temperatures ◽  
Mean Germination Time ◽  
Completely Randomized Design

ABSTRACT: The goal of this work was to characterize morphometrically diaspores from three species of mistletoes (Passovia pyrifolia, Struthanthus marginatus e Phoradendron mucronatum), as well as to study its germination behavior according to temperature and luminosity. In germination tests, the completely randomized design was used, in factor scheme 4 x 2, with 4 replications of 15 diaspores. The factors for the first test were different temperatures and two diaspore conditions (intact and without epicarp). In the second test, factors were different light qualities and two diaspore conditions. The analyzed variables were: germination percentage, germination rate index (GRI) and mean germination time (MGT). Mistletoe’s diaspores present an elliptic shape with viscin layer, an essential characteristic for the dispersion of the species. In addition to this, they present a distinction as for the moisture content when compared to the Loranthaceae and Viscaceae, where the latter presents the highest content. Germination is greater at the alternated temperature of 20-30 oC for P. pyrifolia and P. mucronatum diaspores and 20 oC for S. marginatus. Luminosity interfered in the germination of P. mucronatum and S. marginatus but did not influence P. pyrifolia. The diaspore condition influenced the germination of the three studied species, observing a significant increase in their germination when the epicarp was removed. Temperature and luminosity interfere directly in the GRI and MGT of the three mistletoes species.

scholarly journals Substrate and temperature on seed germination of Aspidosperma vargasii A. DC. (Apocynaceae)

2021 ◽  
Vol 17 (5) ◽  
pp. 66-72
Author(s):  
Izabele Domingues Soares Miranda ◽  
Manoela Mendes Duarte ◽  
Rodrigo Otávio Veiga de Miranda
Keyword(s):  
Seed Germination ◽  
Moisture Content ◽  
Relative Frequency ◽  
Germination Percentage ◽  
Percentage Germination ◽  
Forest Species ◽  
Randomized Design ◽  
Mean Germination Time ◽  
Completely Randomized Design ◽  
Number Of Seeds

The Amazon has a wide diversity, including forest species with timber and non-timber potential, which often have their use restricted due to a lack of silvicultural information. Thus, the present study aimed to evaluate the effect of substrates and temperatures on seed germination of Aspidosperma vagarsii. Therefore, the premise of a completely randomized design was followed, in a 3 x 3 factorial scheme, with three substrates (paper, sand and vermiculite) and three temperatures (20, 25 and 30 °C). The germination percentage, germination speed index and mean germination time were determined, as well as germination relative frequency graphs. In addition, the weight of a thousand seeds, the number of seeds per kilo, and the moisture content was determined. The weight of thousand seeds was equal to 276.4 g, with 3,618 seeds per kilo, and a moisture content of 9.5%. There was no interaction between the studied factors. The sand substrate and temperatures of 20 and 25 °C presented the best results for seed germination of A. vargasii.

scholarly journals ASSESSMENT OF PERIODS OF SAND PRIMING AND HYDRO-PRIMING ON THE GERMINATION OF AFRICAN EBONY (Diospyros mespiliformis Hochst)

2017 ◽  
Vol 17 (1) ◽  
pp. 83-90
Author(s):  
D. O. ADELANI ◽  
R. A. SULEIMAN ◽  
U. U. EMEGHARA
Keyword(s):  
Tree Species ◽  
Mass Production ◽  
Percentage Germination ◽  
Germination Time ◽  
Randomized Design ◽  
Breaking Dormancy ◽  
Mean Germination Time ◽  
Completely Randomized Design ◽  
Agro Forestry

Diospyros mespiliformis (Hochst) is a multipurpose, agro-forestry tree species with diverse environmental and ecological significances. However, low percentage germination associated with its seeds has limited its domestication. To overcome this challenge, there is need to adopt cheap, fast, safe, natural and adoptable physiological techniques such as sand priming and hydro-priming. There is paucity of quantified information on natural and safe methods of relieving dormancy as sand priming and hydro-priming. Most of methods of breaking dormancy as use of acid are not simple, safe and adoptable by farmers who practices agro-forestry. In the light of this, these experiments were conducted to assess the periods of sand priming (0, 2, 4, 6 and 8 weeks) and hydro-priming (0, 2, 4, 6 and 8 weeks) on the germination of D. mespiliformis. Both experiments were laid down in completely randomized design with four replicates. Mean germination times were calculated, and result revealed that a significant increase in percentage germination was recorded with increasing periods of exposing seeds to sand priming up to four weeks. The percentage germination ranged between 28%-93.25% for control (0) and four weeks sand priming respectively. Least value of 8.92 day was recorded for mean germination time of control (0 sand priming). A significant increase in percentage germination was recorded with increasing hours of hydro-priming up to 24 hours. The percentage germination was ranged between 25% - 100% for control (0) hour to 24 hours. Highest germination percentages were recorded in seeds subjected to sand priming for 4weeks (93.25%) and those hydro-primed for 24hours (100%). These results are recommended for mass production of D. mespiliformis in agro-forestry nurseries.  

scholarly journals Efeito da temperatura e do substrato na germinação de Hamatocactus setispinus (Cactaceae)

2015 ◽  
Vol 21 (2) ◽  
pp. 173
Author(s):  
Priscilla Brites Xavier ◽  
Janie Mendes Jasmim
Keyword(s):  
Genetic Diversity ◽  
Seed Germination ◽  
Ornamental Plants ◽  
Germination Index ◽  
Germination Time ◽  
Randomized Design ◽  
Different Temperatures ◽  
Mean Germination Time ◽  
Completely Randomized Design

Cacti are widely used as ornamental plants and seed germination is a major method for preserving genetic diversity. Thus, an experiment was carried out to evaluate the effects of different temperatures and substrates on seed germination of Hamatocactus setispinus. Seeds were sown in gerbox boxes containing either germination paper (S1), sand (S2) or vermiculite (S3). After placing the seeds on the substrates, the boxes were kept in germination chambers at 20, 25, 30 and 35° C for 30 days, under a photoperiod of 16 hours. The experiment was in a completely randomized design with four replicates. The speed germination index (SGI), mean germination time (MT) and germination rates (%) were evaluated. The best results were observed at 25º C. The highest SGI (3.94) was observed on seed germination paper, but MT values and germination rates on this substrate did not differ from those obtained on sand. Therefore, both substrates could be used for germination of this cactus species.

scholarly journals Effects of Hydro and Hormonal Seed Priming on Seed Germination of Milk Thistle under Saline Stress Condition

2014 ◽  
Vol 6 (3) ◽  
pp. 374-380
Author(s):  
Yousef NASIRI ◽  
Parisa FEYZI ◽  
Abdollah JAVANMARD
Keyword(s):  
Salicylic Acid ◽  
Germination Rate ◽  
Seed Priming ◽  
Germination Percentage ◽  
Milk Thistle ◽  
Saline Stress ◽  
Nacl Salinity ◽  
Germination Time ◽  
Randomized Design ◽  
Mean Germination Time

Salinity is an abiotic stress which has harmful effects on germination of many plants. Therefore, high germination rate and vigorous early growth under salty soils is preferred. Seed priming is a way to increase salt tolerance of plants. An experiment was conducted to investigate the effect of seed priming on germination of milk thistle under salinity condition. The treatments were 4 levels of seed priming (no priming, distilled water as hydro priming and 0.5 and 1.0 mM salicylic acid) and 5 levels of salinity (0, 40 and 80 mM NaCl and 40 and 80 mM CaCl2). The experiment arranged as a factorial in a completely randomized design (CRD) with three replications. Results showed that salinity decreased germination percentage and germination rate to about 16 and 32% in 80 mM CaCl2 level compared to control, respectively. The highest mean germination time (5.7 day) were belonged to 80 mM CaCl2. Radicle and plumule length significantly decreased by 80 mM NaCl and 40 and 80 mM CaCl2. The lowest seedling weight and seed stamina observed in 80 mM CaCl2. 0.5 mM salicylic acid improved all traits except mean germination time as compared to control.  Salicylic acid (0.5 mM) improved radicle length under 0, 40 and 80 mM NaCl salinity levels as well as increased plumule length at the 0 and 40 mM NaCl salinity conditions.

scholarly journals Germination and Biochemical Responses to Alkalinity Stress in Two Sesame Cultivars

2016 ◽  
Vol 73 (1) ◽  
pp. 79-86
Author(s):  
Batool Mahdavi
Keyword(s):  
Germination Rate ◽  
Soluble Sugars ◽  
Dry Weight ◽  
Germination Percentage ◽  
Shoot Length ◽  
Percentage Germination ◽  
Total Soluble Sugars ◽  
Randomized Design ◽  
Root And Shoot Length ◽  
Completely Randomized Design

Abstract In this study, the effect of different alkaline concentrations (0, 10, 20, 30, 40, 50, 60 mM) on germination and biochemical characteristics of the two sesame (Sesamum indicum L.) cultivares (Dashtestan and GL-13) which are registered cultivars of Iran were investigated. The experiment was carried out in a completely randomized design with three replications. Results showed that, germination percentage, germination rate, shoot length and dry weight, root length and dry weight and K+ content decreased, whereas, malondialdehyde (MDA), proline, total soluble sugars and Na+ contents increased with increasing alkalinity stress. GL-13 cultivar had the least root and shoot length, proline and K+ content than Dashtestan.

scholarly journals THE GERMINATION OF INDOGOFERA ZOLLINGERIANA BY SOAKING IN LIQUID SMOKE WITH DIFFERENT CONCENTRATIONS

2021 ◽  
Vol 3 (1) ◽  
pp. 36-44
Author(s):  
Yelly Magdalena Mulik ◽  
Stormy Vertygo ◽  
Vivin E. Se’u ◽  
Basry Y. Tang
Keyword(s):  
Germination Rate ◽  
Anova Analysis ◽  
Germination Time ◽  
Liquid Smoke ◽  
Time Treatment ◽  
Randomized Design ◽  
Mean Germination Time ◽  
The Mean ◽  
Indigofera Zollingeriana ◽  
Completely Randomized Design

This study aimed to evaluate the effect of immersion using liquid smoke with different concentrations on the germination viability of Indigofera zollingeriana. The design used was a completely randomized design with 4 treatments: A0 = 0% liquid smoke, A20 = 20% liquid smoke, A40 = 40% liquid smoke, A100 = 100% liquid smoke, each treatment with 4 replications. The parameters observed were the germination viability, mean germination time, and mean daily germination. ANOVA analysis showed that the treatment had a significant effect on germination viability but insignificant on the germination rate and mean germination time. Treatment A0 was the treatment with the highest germination viability (75%), but the highest germination rate (0.34 cm/day) was in treatment A20. The higher the concentration of liquid smoke, the lower the germination viability, the germination rate and the mean germination time.

scholarly journals Cardinal temperatures for germination of Salvia leriifolia Benth

2015 ◽  
Vol 61 (1) ◽  
pp. 5-18 ◽  
Author(s):  
Majid Dashti ◽  
Mohammad Kafi ◽  
Hossein Tavakkoli ◽  
Mahdi Mirza
Keyword(s):  
Regression Models ◽  
Germination Rate ◽  
Germination Percentage ◽  
Randomized Design ◽  
Germination Process ◽  
Mean Germination Time ◽  
Completely Randomized Design ◽  
Response To Temperature ◽  
Germination Traits ◽  
Cardinal Temperatures

Summary The focus of this study is based on the examination of the germination traits and the development of thermal models of the medicinal plant Salvia leriifolia Benth. A laboratory experiment was carried out at constant temperatures ranging from 0 to 35°C, at 5°C intervals in a completely randomized design with eight replications. To describe the germination rate response to temperature, three regression models, namely Intersected-Lines (ISL), Quadratic Polynomial (QPN) and Five-Parameters Beta (FPB) were used. The highest Germination Percentage (GP) (92.8%) occurred in 15°C, but GP in the range of 10-25°C was not significant (p≤0.05). The germination process stopped at 0°C and at above 30°C. The results indicated that the highest Germination Rate (GR), the lowest Mean Germination Time (MGT) and also times to 50% germination (D50) were obtained at 20°C. Seeds did not reach to their 50% germination level in temperatures higher than 25°C. The FPB model had the best realistic estimation for cardinal temperatures. Based on models estimation, Base (Tb), Optimum (To) and Ceiling (Tc) temperatures were in the ranges of (1-1.9°C), (18.1-20.8°C) and (34.5-38.7°C), respectively.

scholarly journals SEED MORPHOBIOMETRY AND GERMINATION OF Sesbania punicea (Cav.) Benth. AND Sesbania virgata (Cav.) Pers.

FLORESTA ◽  
2019 ◽  
Vol 49 (4) ◽  
pp. 661
Author(s):  
Manoela Mendes Duarte ◽  
Jaçanan Eloísa de Freitas Milani ◽  
Thiago Wendling Goncalves de Oliveira ◽  
Christopher Thomas Blum ◽  
Antonio Carlos Nogueira
Keyword(s):  
Moisture Content ◽  
Germination Percentage ◽  
Initial Development ◽  
Blotting Paper ◽  
Randomized Design ◽  
The Family ◽  
Different Temperatures ◽  
Sesbania Virgata ◽  
Mean Germination Time

Belonging to the family Fabaceae, Sesbania punicia and S. virgata are characterized by their ecological potential in the recovery of degraded areas. The present study aimed to describe the physical, morphobiometric characteristics of seeds, the germination phases and the initial development of S. punicia and S. virgata seedlings, as well as the germination behavior of seeds at different temperatures and substrates. For the physical characterization of seeds, the weight of one thousand seeds, number of seeds per kilogram, dry biomass of one thousand seeds and the moisture content were determined. To evaluate the effect of substrate and temperature on germination, the experiment was conducted in a completely randomized design, using a 3 x 3 factorial scheme, three substrates (sand, vermiculite and blotting paper) and three temperatures (20, 25 and 30 °C). The following factors were evaluated: germination percentage, germination speed index, mean germination time and synchronization index. S. punicea presented 13,243 seeds and S. virgata presented 14,414 seeds per kilogram, with moisture content of 14.5 and 7.9 %, respectively. Both species present similar morphobiometry and seedling development. For S. punicea, the blotting paper substrate and the temperature of 25 °C were most efficient for germination. For S. virgata, all treatments were effective for germination.

scholarly journals Estimation of the cardinal temperatures for germination of four Satureja species growing in Iran

2016 ◽  
Vol 62 (1) ◽  
pp. 7-21 ◽  
Author(s):  
Hamed Zarif Ketabi ◽  
Hamid Reza Khazaei ◽  
Ahmad Nezami ◽  
Seyed Reza Tabaei Aghdaei
Keyword(s):  
Regression Models ◽  
Germination Rate ◽  
Germination Percentage ◽  
Randomized Design ◽  
Significant Difference ◽  
Mean Germination Time ◽  
Completely Randomized Design ◽  
Genetic And Environmental Factors ◽  
Cardinal Temperatures ◽  
Temperature Water

SummaryIntroduction Seed germination is a complex physiological process regulated by genetic and environmental factors including temperature, water, oxygen, light and pH. Among them, temperature is one of the most important factors controlling the maximum rate and percentage of diaspore germination. Objective: The aim of the study was to determine the cardinal temperatures (Tb, To, Tc) of four Satureja species growing in Iran. Methods: Seeds of Satureja mutica Fish. et C. A. Mey., S. macrantha C. A. Mey., S. sahandica Bornm and S. bachtiarica Bunge were germinated at nine constant temperatures (from 0 to 40°C) with 5°C intervals. A factorial experiment based on completely randomized design with four replications was applied to determine the cardinal temperatures estimated by three regression models including intersected-lines (ISL), quadratic polynomial (QPN) and five-parameters beta (FPB). Results: The highest germination percentage (GP) occurred at 20°C for S. mutica (86%), S. macrantha (55%), S. sahandica (81%) and S. bachtiarica (89%), but there was no significant difference between 20 and 25°C, except S. sahandica. Germination stopped at 0°C and 40°C. The highest germination rate (GR), the lowest mean germination time (MGT) and time to 50% germination (D50) were obtained at 20-25°C for all species. The GRmfor S. bachtiarica was significantly (p≤0.05) higher than for three other species in all temperatures. None of the species did reach to 50% germination at temperatures higher than 30°C. Conclusion: Obtained results revealed the superiority of S. bachtiarica over the other species, v.s. S. macrantha was inferior. FPB and ISL models were most reliable for predicting cardinal temperatures, because of higher R2value and the lower root mean square error (RMSE). S. macrantha and S. mutica showed the lowest and the highest cardinal temperatures, respectively, in all three models.

scholarly journals Phytotoxicity of Chitosan and SiO2 Nanoparticles to Seed Germination of Wheat (Triticum aestivum L.) and Barley (Hordeum vulgare L.) Plants

2017 ◽  
Vol 9 (2) ◽  
pp. 242-249 ◽  
Author(s):  
Faride BEHBOUDI ◽  
Zeinalabedin TAHMASEBI SARVESTANI ◽  
Mohamad Zaman KASSAEE ◽  
Seyed Ali Mohamad MODARES SANAVI ◽  
Ali SOROOSHZADEH
Keyword(s):  
Germination Rate ◽  
Dry Weight ◽  
Sio2 Nanoparticles ◽  
Triticum Aestivum L ◽  
Germination Percentage ◽  
Hordeum Vulgare L ◽  
Randomized Design ◽  
Direct Exposure ◽  
Contrast Exposure ◽  
Mean Germination Time

Plants such as wheat and barley that are strategically important crops need to be considered to develop a comprehensive toxicity profile for nanoparticles (NPs). The present study was aimed to investigate the effects of chitosan and SiO2 NPs on wheat and barley plants. Two factorial experiments (seeds priming and direct exposure) were performed based on a completely randomized design in four replications. Results showed that the seeds priming with the NPs had not significant effect on germination parameters such as Germination Percentage (GP), Germination Rate (GR), Germination Value (GV), Mean Germination Time (MGT), Pick Value (PV) and Mean Daily Germination (MDG). In contrast, exposure of the seeds to the NPs had significant effects on these parameters. In both experiments, treatments had significant effects on shoot, seedling, root length, fresh and dry weight, as well as vigor indexes as compared to the control. In most traits, the best concentration of NPs was 30 ppm, whereas applications of the NPs with 90 ppm displayed adverse effects on majority of the studied traits. According to these results, selectivity in applications of NPs with suitable concentration and method is essential for different plant species.  

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