Temperature and Light Effects on Germination Behaviour of African Eggplant (Solanum aethiopicum L.) Seeds

Background: A preliminary study of the African eggplant seeds obtained from farmers sources recorded a wide variation in percentage germination under ambient conditions (25±2°C). The germination percentage ranged from 0% to 25%, while fresh seeds ranged between 53% and 87%. As temperature and light are important factors of seed germination, the current study investigated the effect of temperature on the germination pattern and the influence of light interaction with temperature on seed germination of African eggplant (Solanum aethiopicum L.) under controlled conditions. Methods: Seeds of two cultivars of African eggplant were subjected to constant and alternating temperatures and under three light exposure regimes. Seed quality was accessed by per cent germination, mean germination time, time to reach 50% germination, germination index and mean daily germination. Result: The highest percentage germination under constant temperatures was recorded at 25°C (76%) and 20°C (74%). The maximum temperature and light conditions required for maximum seed germination quality (76-95%) at the shortest time (4-5 days) was 30/20°C under alternating 8/16 hours light and dark.

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Effect of heavy metal stress on emerging plants community constructions in wetland

Water Science & Technology ◽

10.2166/wst.2010.496 ◽

2010 ◽

Vol 62 (10) ◽

pp. 2459-2466 ◽

Cited By ~ 6

Author(s):

Han Peng ◽

Wu Geng ◽

Wu Yong-quan ◽

Li Mao-teng ◽

Xiang Jun ◽

...

Keyword(s):

Heavy Metals ◽

Seed Germination ◽

Seedling Growth ◽

Heavy Metal Stress ◽

Germination Percentage ◽

Percentage Germination ◽

Wetland Ecosystem ◽

Ecological Thresholds ◽

Hongze Lake ◽

Seedling Length

In this paper, we report the effects of heavy metals (HMs) (cadmium and mercury) on seed germination and seedling growth of Phragmites australis and Triarrhena sacchariflora, which are the two main typical emerging plants in Hongze Lake wetland. The results showed that there was a reduction in germination percentage, germination index and seedling length as HM concentration in the growing media increased for both treatments. The effect of HMs toxicity on seed germination and seedling growth of T. sacchariflora was more obvious than of P. australis. At the stage of seed germination, P. australis and T. sacchariflora were sensitive to Hg2 + and Cd2 + , respectively, and Hg2 + was more toxic than Cd2 + at the stage of seedling growth. The effect of HMs toxicity is not invariable during plant growth. Compared to the stage of seedling growth, P. australis and T. sacchariflora are more susceptible to HMs at the stage of seed germination. In addition, we calculated the ecological thresholds of P. australis to Cd and Hg are 19.32 and 1.08 mg kg−1, and that of T. sacchariflora to Cd is 4.62 mg kg−1 based on the lab simulation. The results also indicated that the species of P. australis is more tolerant than T. sacchariflora to the HMs and is a better candidate for restoration in Hongze Lake wetland ecosystem.

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Allelopathic Effects of Lantana (Lantana camara) on Milkweedvine (Morrenia odorata)

Weed Science ◽

10.1017/s0043174500059944 ◽

1984 ◽

Vol 32 (6) ◽

pp. 757-761 ◽

Cited By ~ 35

Author(s):

Nagi Reddy Achhireddy ◽

Megh Singh

Keyword(s):

Seed Germination ◽

Seedling Growth ◽

Germination Percentage ◽

Lantana Camara ◽

Test Period ◽

Percentage Germination ◽

Allelopathic Activity ◽

Foliar Symptoms ◽

Allelopathic Effects ◽

Germination And Growth

Allelopathic effects of lantana (Lantana camaraL. ♯3LANCA) residues (root, shoot), foliar leachates, and the soil (where lantana was grown) on milkweedvine (Morrenia odorataLindl. ♯3MONOD) seed germination and growth over a 30-day period were examined. Foliar leachates or the soil collected from the field where lantana had been growing had no effect on the final germination percentage or the seedling growth of milkweedvine. Incorporation of dried lantana shoot or root material into soil had no effect on the final percentage germination but caused significant reductions in milkweedvine growth over a 30-day test period. Roots were more inhibitory than shoots. Fifty percent of milkweedvine seedlings died within 15 days after germination at 1% (w/w) dried lantana root incorporation into the soil, and higher concentrations increased seedling death. Lantana roots incorporated into the soil produced foliar symptoms such as wilting and desiccation, whereas lantana shoots incorporated into the soil produced yellowing of the foliage of milkweedvine. Allelopathic activity of lantana residues was still strong even after decomposition of lantana residues for 4 weeks prior to the planting of milkweedvine seeds.

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Effect of Gibberellic Acid (GA3) and Kinetin on Seed Germination of Sesbania sesban L. and Sesbania rostrata L. (Fabaceae)

Asian Journal of Agricultural and Horticultural Research ◽

10.9734/ajahr/2020/v5i230050 ◽

2020 ◽

pp. 32-41

Author(s):

S. I. Mensah ◽

C. Ekeke ◽

N. K. Ibeagi

Keyword(s):

Seed Germination ◽

Gibberellic Acid ◽

Water Absorption ◽

Glass Container ◽

Germination Percentage ◽

International Institute ◽

Tropical Agriculture ◽

Percentage Germination ◽

Seed Coats ◽

Ibadan Nigeria

We investigated the effects of gibberellic acid (GA3) and kinetin on seed germination of S. sesban L. and S. rostrata L. The matured seeds used for this study were obtained from International Institute for Tropical Agriculture (IITA) Ibadan, Nigeria. The seeds were harvested in 2014 and stored dry in a glass container and kept (15°C) in the refrigerator. The viability of the seeds were determined by floating the intact seeds in water and water uptake (imbibition) was carried out. Four replicates of 20 seeds per replicate were germinated and the seeds observed daily and final count was recorded after 14 days of incubation at 30°C. Intact seeds were soaked in gibberellic acid (GA3) and kinetin for 24h and germination percentage taken. The results from the water absorption demonstrated that the seeds of S. rostrata is more permeable compared to S. sesnban as indicated by higher water absorption of seeds of S. rostrata (70%) to S. sesban (25.4%) after 24hrs of incubation. The anatomy of the seed coats indicated the presence of water and gas impermeable tissues namely cuticle, macrosclereids, osteosclereids and disintegrated parenchyma layer. Generally, 0.1 mM kinetin and GA3 enhanced significant germinations compared to the control with 0% germination for the 14 days period of germination. The percentage germination of seeds of S. sesban and S. rotrata subjected to different treatments and germinated in 0.1 mM GA3 and water showed a progressive decrease in germination. From our study, 0.1 mM GA3 and Kinetin significantly enhanced seed germination of S. sesban and S. rostrata.

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Impact of seed size on seeds viability, vigor and storability of Hordeum vulgare (L.)

Agricultural Science Digest - A Research Journal ◽

10.18805/ag.a-293 ◽

2018 ◽

Author(s):

M. Massimi

Keyword(s):

Seed Germination ◽

Seed Size ◽

Seed Quality ◽

Accelerated Aging ◽

Dry Weight ◽

Germination Percentage ◽

Seedling Vigor ◽

Hordeum Vulgare L ◽

Vigor Index ◽

The Impact

Seed size may influence seed germination, and seedling vigor. Few investigations are available about the effect of seed size on barley seedling vigor in Jordan. The present study was designed to investigate the impact of seed size on germination percentage, seedling dry weight, seedling vigor index, and germination percentage after accelerated aging in barley. Three seed sizes i.e. large, medium, and small (having diameter of > 2.75 millimeter, 2.5 - 2.75 millimeter, and less than 2.5 millimeter, respectively) were tested in the experiment. Seed quality for different seed size categories was evaluated in the laboratory by measuring seed germination, germination after accelerated aging, as well seedling dry weight and vigor index. Results showed significant differences for large seeds in germination percentages, seedling dry weight and vigor index. It may be concluded that large seed size of barley showed best quality.

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The Effect of Temperature on Seed Germination and Seedling Growth of Two Invasive Plants in Rorippa

Biotechnology Journal International ◽

10.9734/bji/2020/v24i530116 ◽

2020 ◽

pp. 39-48

Author(s):

Qiuli Wang ◽

Bo Qu ◽

Juanjuan Mi ◽

Yufeng Xu ◽

Meini Shao

Keyword(s):

Seed Germination ◽

Invasive Plants ◽

Seedling Growth ◽

Petri Dish ◽

Germination Percentage ◽

Laboratory Culture ◽

Liaoning Province ◽

Effect Of Temperature ◽

Invasion Mechanism ◽

Root Shoot Ratio

Aims: By studying the response of seed germination and seedling growth of invasive plants, Rorippa amphibia and Rorippa sylvestris, to temperature, the influence of temperature on the invasive ability of two species of Rorippa were further analyzed, which provided a theoretical basis for revealing the diffusion and invasion mechanism of two invasive plants in Rorippa. Study Design: Seed germination and seedling growth test of two invasive plants in Rorippa at different temperature was studied by means of laboratory culture. The germination percentage, germination index, germination potential of the seeds and the total leaf number, root length, lateral root number, biomass and root shoot ratio of seedlings were determined. Place and Duration of Study: Seeds were collected from the Shenyang Agricultural University of Liaoning Province in July 2018. Experiments were done in the College of Bioscience and Biotechnology, and conducted in April 2019 for a month. Methodology: The petri dish method was used at the experiment of seed germination. The seedling growth experiment was carried out by pot sowing. Results: At the seedling stage.R. amphibia has the strongest tolerance at 30°C, while the R. sylvestris does at 35°C. The low temperature is more beneficial to the accumulations of the seedlings, R. amphibia is the most tolerant at 25°C, and R. sylvestris is at 30°C at the seedling stage. Conclusion: The response of the seeds and seedlings of the two species to temperature was basically the same. Higher temperature promoted seed germination and inhibited seedling growth, while lower temperature inhibited seed germination. The response of seeds and seedlings of R. sylvestris to high temperature makes it more invasive in the process of global warming.

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Sensitivity of Seed Germination to Temperature and Light in Helichrysum amorginum

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca Horticulture ◽

10.15835/buasvmcn-hort:2020.0007 ◽

2020 ◽

Vol 77 (1) ◽

pp. 7

Author(s):

Sofia ARGYRIOU ◽

Panayiota PAPASTYLIANOU ◽

George STAVROPOULOS ◽

Angeliki KOUSTA ◽

Ioanna KAKABOUKI ◽

...

Keyword(s):

Seed Germination ◽

Seedling Survival ◽

Germination Percentage ◽

Effect Of Temperature ◽

Germination Time ◽

Randomized Design ◽

Perennial Shrub ◽

Mean Germination Time ◽

Lower Temperature ◽

Seed Propagation

Helichrysum amorginum is a perennial shrub, endemic on the Greek island of Amorgos and used for medicinal, cosmetic and ornamental purposes. Information concerning germination behavior and seedling survival is considered essential for the establishment and cultivation of wild species. The objective of this study was to investigate the effect of temperature and light on germination of Helichrysum amorginum seeds. A set of experiments was conducted under completely randomized design with four replications of 200 seeds at three different suboptimal germination temperatures (15, 20 and 25°C) in light and dark conditions for 10 days. Seed material was collected from two different fields of the island (Aegiali and Katapola). The germination performance was evaluated by final germination percentage and mean germination time. The effect of temperature on seed germination percentage and mean germination time was significant in all cases. The presence of light enhanced germination, especially at the optimum temperature of 20°C. In most cases the mean germination time increased at the lower temperature of 15°C. Seeds from Aegiali exhibited higher germination ability than the seed lot from Katapola. Knowledge of seed germination behaviour is of major importance in order to establish effective protocols for seed propagation in Helichrysum amorginum.

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Experimental seed germination for ex situ conservation of Mexican Podostemaceae

Botanical Sciences ◽

10.17129/botsci.2232 ◽

2019 ◽

Vol 97 (3) ◽

pp. 413 ◽

Cited By ~ 1

Author(s):

Valeria Flores-Enríquez ◽

Guillermo Castillo ◽

Margarita Collazo-Ortega

Keyword(s):

Seed Germination ◽

Storage Time ◽

Light Quality ◽

Germplasm Conservation ◽

Seed Storage ◽

Germination Percentage ◽

Seed Banks ◽

Ex Situ ◽

Effect Of Temperature ◽

Collection Site

Background: Podostemaceae are extremely susceptible to local extinction by habitat loss. Since ~70 % of the river systems in Mexico show some degree of water contamination, it is relevant to generate information about seed storage and germination behavior to design germplasm conservation strategies (e.g., ex situ seed banks) of Mexican podostemads.Hypotheses: Seed germination decreases as seed storage time increases. Further, light quality, temperature and collection site influence similarly the germination response of both species.Studied species: Marathrum foeniculaceum Humb. & Bonpl., Noveloa coulteriana (Tul.) C. PhilbrickStudy site and years of study: 13 different seeds collections (1996-2013), at four locations in the rivers Horcones and Arroyo del Rincon Jalisco, México. Methods: A germination chamber experiment was performed to evaluate the effect of temperature, light quality and storage time on the germination of both species.Results: Seeds lose viability after nine years of storage. In both species, the time to reach the highest Accumulated Germination Percentage (AGP) was faster in seeds of one-two yr compared to seeds of six-seven yr. N. coulteriana have significant differences in Final Germination Percentage (FGP) between collection rivers. Storage time affects AGP of N. coulteriana more than in M. foeniculaceum.Conclusions: Both species can form ex situ seed banks up to 8 yr age in paper bags storage. N. coulteriana is more susceptible to variation in storage conditions compared to M. foeniculaceum. Collection site affect seed germination after storing. Long-term conventional ex situ seed germination storage is not a viable strategy to conserve germplasm of Podostemaceae.

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Conditioning in the promotion and uniformization of Umbu seed germination

Revista Brasileira de Fruticultura ◽

10.1590/0100-29452018109 ◽

2018 ◽

Vol 40 (1) ◽

Author(s):

Renato Teo Barros ◽

Cibele Chalita Martins ◽

Francisco Elder Carlos Bezerra Pereira ◽

Givanildo Zildo da Silva

Keyword(s):

Electrical Conductivity ◽

Seed Germination ◽

Water Content ◽

Environmental Conditions ◽

Seed Quality ◽

Germination Rate ◽

Ambient Conditions ◽

Germination Test ◽

Mean Germination Time ◽

Cold Chamber

Abstract Seed dormancy may decrease during storage and some environmental conditions may accelerate this process. The aim of this work was to determine efficient techniques to condition umbu seeds in order to promote and standardize their germination. Seeds were stored for 180 days in paper bags kept in five ambient conditions: laboratory (25 ºC and 55% RH); warm oven (40 °C and 53% RH); hot oven (50 °C and 49% RH); dry chamber (18 °C and 65% RH) and cold chamber (10 °C and 65% RH). Seed quality was evaluated every 60 days by means of the following tests and determinations: water content; germination test (25 °C and 55% RH, weekly evaluated up to 91 days after sowing); first count test (14 days); germination rate index; mean germination time and electrical conductivity. The conditioning of umbu seeds in laboratory, or in warm oven (40 ºC) used efficient techniques to promote and standardize germination; under these conditions, after six months of storage, germination increased from 31% to 84 and 74%, respectively.

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The Alleviation Effect of Silicon on Seed Germination and Seedling Growth of Tomato Under Salinity Stress

Vegetable Crops Research Bulletin ◽

10.2478/v10032-012-0008-z ◽

2012 ◽

Vol 76 (1) ◽

pp. 119-126 ◽

Cited By ~ 8

Author(s):

Maryam Haghighi ◽

Zahra Afifipour ◽

Maryam Mozafarian

Keyword(s):

Seed Germination ◽

Salinity Stress ◽

Seedling Growth ◽

Germination Rate ◽

Germination Percentage ◽

Percentage Germination ◽

Tomato Seeds ◽

Germination Characteristics ◽

Salinity Levels ◽

Mean Germination Time

The Alleviation Effect of Silicon on Seed Germination and Seedling Growth of Tomato Under Salinity StressThis study was conducted to evaluate the effectiveness of silicon (Si) application under salinity levels on seed germination and growth characteristics of tomato seeds. A laboratory experiment was performed on completely randomized design with two levels of salinity (25 and 50 mM NaCl) and 2 concentration of Si (1 and 2 mM) with 4 replications. Germination percentage, germination rate, seedling shoot and root length, fresh and dry weight of seedling and mean germination time was measured. Seed germination ofLycopersicon esculentumL. was significantly affected by salinity levels, Si and their interaction. Germination characteristics of tomato seeds decreased drastically by increasing NaCl concentrations. However, 1 mM Si had positive effects on seed germination characteristics and improved germination percentage, germination rate and mean germination time. Si alleviated the harmful effect of salinity stress on tomato seed germination at almost all germination characteristics.

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Effect of Calcium and Irrigation Treatments on Peanut Yield, Grade and Seed Quality1

Peanut Science ◽

10.3146/i0095-3679-3-2-8 ◽

1976 ◽

Vol 3 (2) ◽

pp. 81-85 ◽

Cited By ~ 29

Author(s):

F. R. Cox ◽

G. A. Sullivan ◽

C. K. Martin

Keyword(s):

Seed Germination ◽

Seed Quality ◽

Interaction Effects ◽

Germination Percentage ◽

Yield Response ◽

Planting Dates ◽

Yield Increase ◽

Large Yield ◽

Irrigation Treatments

Abstract The effect of irrigation and/or Ca (calcium) application on yield, grade and seed quality was studied using Florigiant peanuts planted on three dates. Calcium application resulted in a small, but consistent, yield increase at all planting dates. Irrigation resulted in a large yield response on early planted peanuts and no response on late planted ones. Grade, specifically sound mature kernel percentage, was improved by both Ca and irrigation treatments but the effects were only slightly additive. Similar interaction effects were noted as these treatments increased the germination percentage of the seed produced and decreased the percentage of kernels with the form of damage termed dark plumule. Both treatments also decreased the amount of watery hypocotyl damage and increased the Ca concentration in the seed. Germination was 89 to 94% when the seed Ca level was greater than 420 ppm, but fell linearly to 52% when the seed Ca decreased from 420 to 200 ppm.

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