scholarly journals Germination Characteristics of SC701 Maize Hybrid According to Size and Shape at Different Temperature Regimes

2015 ◽  
Vol 18 (4) ◽  
pp. 514-521 ◽  
Author(s):  
Dolapo Bola Akinnuoye ◽  
Albert Thembinkosi Modi
Keyword(s):  
Maize Hybrid ◽  
Size And Shape ◽  
Temperature Regimes ◽  
Germination Characteristics

Dormancy and Germination of Seed of Eight Populations of Themeda australis

1982 ◽  
Vol 30 (4) ◽  
pp. 373 ◽  
Author(s):  
RH Groves ◽  
MW Hagon ◽  
PS Ramakrishnan
Keyword(s):  
Population Stratification ◽  
Physiological Adaptation ◽  
Dormant Seed ◽  
Seed Formation ◽  
Fresh Seed ◽  
Temperature Regimes ◽  
Germination Characteristics ◽  
Moisture Regimes ◽  
Different Populations ◽  
Climatic Characteristics

Seed of eight populations of Themeda australis (R.Br.) Stapf from sites nith the widest range of climates in Australia and Papua New Guinea (P.N.G.) was tested for its dormancy status and germination responses to different temperature and moisture regimes. The populations were from Lae. P.N.G.. Katherine. N.T.. Mundubbera. Qld. Alice Springs. N.T.. Tantangara. N.S.W.. Adelaide Hills. S.A.. Bunbury, W.A. and Hobart. Tas. Dormancy of fresh seed was negligible in Lae and Mundubbera populations. considerable in the Alice Springs population and intermediate in populations from Katherine and all temperate sites. Addition of gibberellic acid hastened the release from dormancy of seed from Katherine and Bunbury. Exposure of plants to three different temperature regimes during seed formation had an effect on dormancy of the Katherine population. Stratification at 4°C and high alternating daily temperatures (45 20°C) hastened the loss of dormancy of fresh seeds of some populations. Germination of non-dormant seed of the different populations was relatively unaffected b) temperatures between 20 and 40°C. Germination of the Alice Springs population was the most sensitive to increasing water stress and that from Lae the least sensitive. Radicle elongation of seedlings from Alice Springs was significantly greater than that of most other populations at a water potential of - I .0 MPa. The differences reported for seed dormancy and germination characteristics of T. australis populations do not reflect a strong physiological adaptation to the climatic characteristics of the sites from which they were collected.

Seed quality and germination characteristics of tamarack in northwestern Ontario

1986 ◽  
Vol 16 (3) ◽  
pp. 680-683 ◽  
Author(s):  
Robert E. Farmer Jr. ◽  
Ronald W. Reinholt
Keyword(s):  
Seed Quality ◽  
Northwestern Ontario ◽  
Temperature Regimes ◽  
Germination Characteristics ◽  
Before And After ◽  
Alternating Temperature ◽  
Individual Trees ◽  
Incubation Temperatures

Tamarack seed from provenances in northwestern Ontario were incubated in light and dark under a range of alternating temperature regimes (5–15, 10–20, and 20–30 °C) before and after 33 days stratification. Unstratified sound seed germinated completely in light at all incubation temperatures. Partial germination of unstratified seed took place in the dark at 20–30 °C, but stratification was required for dark germination at lower temperatures. Wide variation in dark germination was noted among seed lots from individual trees, but stand and provenance differences were nonsignificant. Much of the variation in seed quality among tree lots was related to differences in the degree of embryo failure.

scholarly journals The Germination of Perennial Wall Rocket (Diplotaxis Tenuifolia (L.) DC.) and Annual Garden Rocket (Eruca Sativa Mill.) Under Controlled Temperatures

2014 ◽  
Vol 65 (1) ◽  
pp. 15-28 ◽  
Author(s):  
Matthew Hall ◽  
Jenny Jobling ◽  
Gordon Rogers
Keyword(s):  
Germination Percentage ◽  
Perennial Species ◽  
Eruca Sativa ◽  
Ambient Temperatures ◽  
Temperature Regimes ◽  
High Germination ◽  
Germination Characteristics ◽  
Diurnal Temperatures ◽  
Germination Value ◽  
Respective Species

AbstractThe germination characteristics of three cultivars of perennial wall rocket and annual garden rocket were assessed at constant and diurnal temperatures for ten days. The seeds were exposed to constant temperatures of 5, 10, 15, 20, 25, 30 and 35°C or diurnal temperatures of 24/10, 28/16 and 18/5°C, with a 12/12 h exposure of each regime. The diurnal temperatures were chosen to reflect the minimum and maximum ambient temperatures experienced in Ellis Lane, Australia; during the spring, summer and winter. The total germination percentage (TGP) of perennial wall rocket was the highest at 20 to 30°C, whereas the highest TGP occurred at 10 to 30°C for annual garden rocket. The daily germination speed (DGS) and germination value (GV) are two useful formulas used to express the germination characteristics of seeds that under certain conditions do not achieve ≥50% germination. For both species, there was a significant interaction between the cultivar and temperature for the DGS and GV at both constant and diurnal temperatures; illustrating that the commercial cultivars of these species germinate at different rates in response to different ambient temperatures. This has important implications for the commercial production of these species, as cultivars with high germination rates need to be chosen for different seasonal conditions. At diurnal temperatures, there was an interaction between the cultivar and temperature for perennial wall rocket, with the cvs. DT1 and DT2 having similar TGPs across all of the temperature regimes, whereas the cv. DT3 had lower TGPs across all of the regimes. There was no interaction between the cultivar and diurnal temperature for annual garden rocket; however, temperature did influence the TGP, with higher values at 24/10 and 18/5°C. The germination of the smaller seeds from the perennial species was found to be more dependent on temperature than the larger seeds from the annual species. This is likely due to differences in stored reserves and the influence of secondary dormancy in the respective species.

scholarly journals Temperature Effects on the Speed and Completion of Germination of 19 Commercially Available Seeded Bermudagrass Cultivars

2013 ◽  
Vol 23 (1) ◽  
pp. 82-85 ◽  
Author(s):  
Michael T. Deaton ◽  
David W. Williams
Keyword(s):  
Cynodon Dactylon ◽  
Germination Rate ◽  
Early Summer ◽  
Golf Course ◽  
Science Laboratory ◽  
University Of Kentucky ◽  
Temperature Regimes ◽  
Germination Characteristics ◽  
Athletic Field ◽  
The University

The use of seeded bermudagrasses (Cynodon dactylon) is increasing as athletic field and golf course turf. Anecdotal evidence indicates probable and important differences in germination rates among cultivars when established in late spring or early summer. Germination studies were completed in May 2011 in the Turfgrass Science Laboratory at the University of Kentucky on 19 commercially available seeded bermudagrass cultivars. Evaluations for germination rate and total germination under varying temperature regimes representing 20-year average day/night temperatures for seeding times from 15 May to 1 Aug. were conducted to quantify any differences in germination characteristics among cultivars as affected by temperature. There were highly significant differences (P < 0.0001) among cultivars in germination rate and total germination when grown under 20-year average day/night temperatures. The cultivars Casino Royale and Riviera consistently represented the fastest/slowest to germinate and highest/lowest total seeds germinated across all temperature regimes, respectively. Significant differences (P < 0.0001) were also observed within cultivars for total germination across the temperature regimes tested. The average temperatures of 15 May and 1 Aug. represented slowest/fastest to germinate and lowest/highest total seeds germinated across all temperature regimes, respectively.

scholarly journals Seed germination characteristics of Halogeton glomeratus

2001 ◽  
Vol 79 (10) ◽  
pp. 1189-1194 ◽  
Author(s):  
M Ajmal Khan ◽  
Bilquees Gul ◽  
Darrell J Weber
Keyword(s):  
Seed Germination ◽  
Great Basin ◽  
Temperature Regime ◽  
Germination Rate ◽  
Distilled Water ◽  
Salinity Treatment ◽  
Temperature Regimes ◽  
Germination Characteristics ◽  
Nacl Concentration ◽  
Halogeton Glomeratus

Halogeton glomeratus (Bieb.) C.A. Mey, an annual forb in the family Chenopodiaceae, is widely distributed in the inland salt deserts of western North America. Experiments were conducted to determine the effects of NaCl and temperature on seed germination and the recovery of germination responses after transfer to distilled water. Seeds of H. glomeratus were germinated at various temperature regimes (5–15°C, 10–20°C, 10–30°C, 15–25°C, 20–30°C, and 25–35°C), and salinities (0, 200, 400, 600, 800, and 1000 mM NaCl) in a 12 h dark : 12 h light photoperiod. Increases in NaCl concentration progressively inhibited seed germination, and this inhibition was more substantial in the dark than in the photoperiod treatment. Seed germination at concentrations higher than 800 mM NaCl was low (10%). Cooler temperatures significantly inhibited germination in all treatments. A temperature regime of high night (25°C) and high day (35°C) temperatures led to higher germination. Rate of germination decreased with an increase in salinity and was highest at 25–35°C and lowest at 5–15°C temperature regimes. Seeds were transferred from salt solution to distilled water after 20 days, and those from high salinities recovered quickly at all temperature regimes. Recovery germination percentages from the highest salinity treatment varied from 51 to 100% at various temperature regimes.Key words: Great Basin desert, Halogeton glomeratus, halophyte, recovery of seed germination, salt deserts, temperature regime.

scholarly journals Germination Characteristics and Mobilization of Seed Reserves in Maize Varieties as Influenced by Temperature Regimes

1970 ◽  
pp. 51-58
Author(s):  
S Sikder ◽  
MA Hasan ◽  
MS Hossain
Keyword(s):  
Laboratory Experiment ◽  
Metabolic Activity ◽  
Dry Weight ◽  
Metabolic Efficiency ◽  
Temperature Regimes ◽  
Germination Characteristics ◽  
Maize Varieties ◽  
Seed Reserves ◽  
Key Words Maize ◽  
Hybrid Maize

In a laboratory experiment seeds of four maize varieties viz., BARI hybrid maize -5, BARI hybrid maize -2, BARI maize -7 and BARI maize -5 were germinated at 24, 30 and 36°C to study seed metabolic activity and seed reserve translocation. Temperature had significant effect on germination characteristics and seed reserves mobilization. The shoot dry weights were increased with the increase of temperature from 24 to 36°C. But in root dry weight and length of shoot and root the highest value was found at 30°C compared to 24 to 36°C. At moderate temperature (30°C) all the varieties showed highest seed metabolic efficiency (SME) than those of at 24 and 36°C temperature and hybrid varieties BARI hybrid maize -2 and BARI hybrid maize -5 attained higher seed metabolic efficiency than the BARI maize -5 and BARI maize -7. Key words: Maize; temperature; germination; seed metabolic efficiency. DOI: 10.3329/jard.v7i1.4421 J Agric Rural Dev 7(1&2), 51-56, June 2009

scholarly journals Seed dormancy and germination characteristics of Acer cinnamomifolium, a plant species endemic to China

2021 ◽  
Author(s):  
Cui-Fang Tang ◽  
Yu-Chen Zhao ◽  
Lin-Feng Ou ◽  
Cai-Hong Zhong ◽  
Song-Quan Song
Keyword(s):  
Seed Germination ◽  
Plant Species ◽  
Seed Dormancy ◽  
Environmental Changes ◽  
Effect Of Temperature ◽  
Cold Stratification ◽  
Dormancy Release ◽  
Temperature Regimes ◽  
Germination Characteristics ◽  
Alternating Temperature

Seed dormancy is an adaptive response of plants to environmental changes during long-term evolution. It plays an important role in plant survival and propagation. Acer cinnamomifolium, a plant species endemic to China, is an excellent garden and street tree species. However, dormancy and germination characteristics of A. cinnamomifolium seeds are not currently known. In the present paper, the mature seeds were used as experimental materials and we investigated the effect of temperature including alternating temperature, light, after-ripening, stratification and phytohormone on seed dormancy release and germination. After being incubated for 30 days, 0 to 10% of the seeds germinated in constant temperature (10, 15, 20, 25 and 30°C), while in alternating temperature regimes (20/10, 25/15 and 30/20°C), seed germination was < 35%. Dormancy release and germination of seeds can be increased by after-ripening, cold stratification and phytohormone treatments. We concluded that A. cinnamomifolium seeds have a non-deep physiological dormancy. Cold stratification at 4°C for 30 days and incubation thereafter at 20°C were found to be optimal for dormancy release and high seed germination.

scholarly journals Effects of drought and temperature on the germination of seeds of Seriphidium transiliense, a desert xerophytic subshrub of Xinjiang, China

2020 ◽  
Vol 48 (3) ◽  
pp. 355-365
Author(s):  
Aiping Chen ◽  
Yuxiang Wang ◽  
Xiaoqing Sui ◽  
Guili Jin ◽  
Kun Wang ◽  
...  
Keyword(s):  
Seed Germination ◽  
Arid Regions ◽  
Germination Percentage ◽  
Temperature Regimes ◽  
Germination Ability ◽  
Germination Characteristics ◽  
Vigour Index ◽  
Effects Of Drought ◽  
Plant Life Cycle ◽  
Mean Time

Global warming has led to changes in rainfall patterns in many regions and it has an increasing impact on the availability of water for plants, especially in the arid and semi-arid regions. Seed germination is the most critical stage in the plant life cycle, it determines whether or not the population can successfully establish. Here, we assessed the seed germination characteristics of Seriphidium transiliense under six water potentials and four temperature regimes. S. transiliense seeds could germinate from 5/15°C to 20/30°C, while the optimum temperature regime was 10/20°C. As water potential decreased, the germination percentage, germination index, germination energy, vigour index, plumule length and radicle length increased and then decreased, while mean time to germinate decreased and then increased. The optimum condition for S. transiliense seed germination was -0.2 MPa at 10/20°C. Some seeds that failed to germinate under drought conditions were transferred to distilled water and recovered germination ability.

Germination Characteristics of Three Species ofCruciferae

Weed Science ◽  
1970 ◽  
Vol 18 (1) ◽  
pp. 41-48 ◽  
Author(s):  
James A. Young ◽  
Raymond A. Evans ◽  
Richard O. Gifford ◽  
Richard E. Eckert
Keyword(s):  
Soil Moisture ◽  
Incubation Temperature ◽  
Moisture Stress ◽  
Soil Samples ◽  
Total Degree ◽  
Temperature Dependent ◽  
Soil Moisture Stress ◽  
Temperature Regimes ◽  
Germination Characteristics ◽  
Alternating Temperature

Germination of tumble mustard (Sisymbrium altissimumL.), tansy mustard (Descurainia pinnata(Walt.) Britton), and yellowflower pepperweed (Lepidium perfoliatumL.) is partially dependent on total degree hours of incubation (temperature above 0 C times the duration of incubation). This relation was similar under constant or alternating temperatures. Alternating temperature regimes with −20 C inhibited germination, and greatly depressed subsequent germination at optimum temperatures. Tansy mustard and yellowflower pepperweed have temperature-dependent after-ripening requirements. Germination of all three species responded similarly to osmotic stress. The relation between tumble mustard germination under osmotic or soil moisture stress is dependent on the texture of the soil substrate. A mucilaginous coating greatly aids the germination of yellowflower pepperweed seeds on the surface of media under low (0.05 to 0.2 bars) moisture tension. Germination of seeds of the three species recovered in soil samples from the field is radically different from that of freshly harvested material. The seeds acquire a dormancy which is broken irregularly under ideal conditions for germination.

Reciprocal Common Garden Studies of the Germination of Seeds of Big Sagebrush (Artemisia tridentata)

Weed Science ◽  
1989 ◽  
Vol 37 (3) ◽  
pp. 319-325 ◽  
Author(s):  
James A. Young ◽  
Raymond A. Evans
Keyword(s):  
Plant Communities ◽  
Common Garden ◽  
Moisture Stress ◽  
Freezing Temperature ◽  
Big Sagebrush ◽  
Temperature Regimes ◽  
Germination Characteristics ◽  
Alternating Temperature ◽  
Incubation Temperatures

Experiments were conducted to compare the influence of production site and seed source on the germination of big sagebrush seeds in relation to incubation temperatures. Seeds of big sagebrush were collected from five plant communities located on the margin of the Carson Desert in western Nevada. Seedlings were grown from the seeds and transplanted back to the sites of collection in reciprocal gardens. Seeds from 1-yr-old gardens were tested for germination at a constant 15 C for three consecutive years. The greater quantity of seeds produced by 2- and 3-yr-old gardens were tested at 55 constant or alternating temperature regimes. Seeds of big sagebrush produced in reciprocal gardens had lower germination than seeds collected from native stands at the same locations. The reduced germination disappeared as the reciprocally transplanted plants grew older and larger, but seeds from these plants did not reach the same levels of germination as those collected from native stands at the same location. Moisture stress and/or freezing temperature conditions during flowering may have directly influenced the quality of seeds produced or interacted with the inherent genotypes of big sagebrush to trigger seed production of variable quality in relation to germination characteristics.

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