Effect of light, salinity, and temperature on seed germination of Limonium stocksii

2004 ◽  
Vol 82 (2) ◽  
pp. 151-157 ◽  
Author(s):  
Sabahat Zia ◽  
M Ajmal Khan
Keyword(s):  
Seed Germination ◽  
Temperature Regime ◽  
Germination Rate ◽  
Gradual Decrease ◽  
Salinity Treatment ◽  
Optimal Temperature ◽  
Complete Darkness ◽  
Temperature Regimes ◽  
Effect Of Light ◽  
Recovery Temperature

Limonium stocksii (Boiss.) Kuntze (Plumbaginaceae) is a perennial, woody shrub distributed at Hawks Bay, Karachi, Pakistan. Experiments were carried out to investigate seed germination responses of L. stocksii at different salinities (0, 100, 200, 300, 400, and 500 mmol/L NaCl) and under different temperature regimes (10:20, 15:25, 20:30, and 25:35 °C), both in a 12 h dark : 12 h light photoperiod and in complete darkness. The highest percentage of germination (about 100%) was obtained at 0, 100, and 200 mmol/L NaCl at 20:30 °C, and a further increase in salinity resulted in a gradual decrease in germination. Less than 5% of seeds germinated at 500 mmol/L NaCl. Germination under salinity treatment at 15:25 °C was slightly more inhibitory than the optimal temperature regime, whereas under both 10:20 and 25:35 °C temperature regimes, seed germination was substantially reduced and few seeds germinated at concentrations higher than 200 mmol/L NaCl. Germination rate was fastest at 20:30 °C and slowest at 10:20 °C. Relatively low seed germination was obtained in the dark in comparison to seeds germinated in a 12-h photoperiod under saline conditions. Recovery experiments showed that exposure of seeds to various salinity and temperature regimes had little effect on viability of seeds.Key words: germination, light, Limonium stocksii, NaCl, recovery, temperature.

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 The Effects of Temperature, Light and Moisture on the Seed Germination of Siphonostegia chinensis Benth.

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Yongji Wang
Keyword(s):  
Seed Germination ◽  
Germination Rate ◽  
Germination Index ◽  
High Concentration ◽  
Complete Darkness ◽  
Germination Potential ◽  
Medium Level ◽  
Different Temperatures ◽  
High Level ◽  
Germination Experiment

To explore the optimum temperature, light intensityand water conditions for seed germination of Siphonostegia chinensis Benth.,seed germination experiment were carried out under different temperatures（5/15, 10/20, 15/25, 20/30℃）, different light intensity（14h light/10h darkness, complete darkness）and different concentrations（0％, 5％, 10％, 15％, 20％）of PEG-6000 solution. In terms of concentration, 5% PEG was regarded as the low level, 10% and 15% as the medium level, and 20% as the high level. The results showed that (1) Germination rate, germination potential, and germination index were increased with the rise of temperature. In addition, seed germination was significantly higher under the dark conditions than that with the 14h light/10h darkness. (2) No seed germination occurred when the temperature was below 10/20 ºC at 14h light/10h darkness. (3) Under 14h light/10h darkness, the germination rate, germination potential and germination index first increased and then decreased with the increase of PEG concentration. The low concentration was more beneficial to the seed germination. (4) Under the condition of complete darkness, the germination rate, germination potential and germination index decline with fluctuation with the increase of PEG concentration. Seed germination of Siphonostegia chinensis Benth. was inhibited in high concentration of PEG.

Fluctuating temperature and light influence seed germination of goosegrass (Eleusine indica)

Weed Science ◽  
1997 ◽  
Vol 45 (3) ◽  
pp. 426-429 ◽  
Author(s):  
Roy K. Nishimoto ◽  
Lambert B. McCarty
Keyword(s):  
Seed Germination ◽  
Temperature Regime ◽  
Fluctuating Temperature ◽  
Eleusine Indica ◽  
Temperature Cycles ◽  
Temperature Regimes ◽  
Moist Environment

This research examined the effect of duration of the warm cycle and number of fluctuating temperature/light cycles on goosegrass seed germination. Less than 10% goosegrass seed germination occurred at constant temperatures of 20, 25, and 35 C, while 99% germinated at daily fluctuating temperature regimes of 20 C for 16 h and 35 C for 8 h with light. Increasing the number of fluctuating temperature cycles increased goosegrass seed germination. Fluctuating temperature cycles with 22 h at 20 C and 2 h at 35 C with light strongly stimulated germination, but not as much as the cycle with 8 h at 35 C. Goosegrass seed germination ceased once the fluctuating temperature regime was discontinued, and constant 20 C with 8 h light daily was reimposed. Germination occurred only on resumption of fluctuating temperature cycles. Seed incubated for several weeks in a moist environment at constant 20 C had 81 to 91% germination with two cycles of 20 C for 16 h and 35 C for 8 h, compared to 14% for fresh seeds.

scholarly journals Effect of light quality on Tabebuia rosea seed germination

2014 ◽  
Vol 20 (2) ◽  
pp. 191
Author(s):  
Sofía Basto ◽  
Claudia Ramírez
Keyword(s):  
Seed Germination ◽  
Light Quality ◽  
Germination Rate ◽  
Germination Capacity ◽  
Germination Speed ◽  
Tabebuia Rosea ◽  
Germination Value ◽  
Positive Effect ◽  
Effect Of Light ◽  
Peak Value

Tabebuia rosea germination capacity and rate have been examined under light and dark conditions. However, seeds responses to light quality, in particular to short and mid-wavelengths, are not well known. We hypothesized that short wavelengths would have a positive effect on rosea germination. The effects of short, mid and long-wavelengths on germination capacity, rate (germination rate index, germination rate R50, a devised index of germination rate R50´ and peak value), mean daily germination and germination value were evaluated. Light quality had little effect on germination capacity; it was reduced only in darkness. Seeds under short and mid-wavelengths germinated faster (germination rate) than under any other light treatments. We concluded that althoughlt T. rosea seeds respond to all light quality treatments, the short and mid-wavelengths are the cue for increasing germination speed. For synchronizing germination, short and mid-wavelengths transmitted by red cellophane paper can be used as a pre-germinative treatment for restoration and silvicultural purposes.

scholarly journals Climate Warming Facilitates Seed Germination in Native but Not Invasive Solidago canadensis Populations

2020 ◽  
Vol 8 ◽  
Author(s):  
Xiao-Hui Zhou ◽  
Wei-Ming He
Keyword(s):  
Seed Germination ◽  
Climate Warming ◽  
Seed Quality ◽  
Germination Rate ◽  
Plant Performance ◽  
Solidago Canadensis ◽  
Seed Traits ◽  
Temperature Regimes ◽  
Native Populations ◽  
Germination Timing

Plant performance is commonly temperature-dependent so that this performance could vary with climate warming. Seeds are among the most important propagules of plants, and seed traits strongly influence plant invasion success. Therefore, understanding seed traits under climate warming is useful for predicting invasion risks. To this end, we conducted a warming experiment with an infrared radiator and examined the effects of 5 years warming (approximately 2°C above ambient) on the seed quality and subsequent germination of Solidago canadensis from North America, where it is native (24 native populations), and from China, where it is invasive (29 invasive populations). Temperature regimes (i.e., ambient vs. warming) interacted with population sources (i.e., native vs. invasive) to significantly influence seed germination, but not thousand-seed mass. Warming significantly advanced the seed germination timing of native S. canadensis populations and increased their seed germination rate; warming did not influence the germination timing but decreased the germination rate of invasive S. canadensis populations. Across two temperature regimes combined, 24 native S. canadensis populations had smaller seeds, later germination timing, and lower germination rate than 29 invasive S. canadensis populations. These findings suggest that climate warming could facilitate the seed germination of native but not invasive populations. Our data also highlight that invasive populations might be more successful than native populations due to better seed quality and faster and higher seed germination.

Relating germination requirements of timber milkvetch to seral stage in the Interior Douglas-fir zone

2014 ◽  
Vol 94 (4) ◽  
pp. 723-726
Author(s):  
D. J. Thompson
Keyword(s):  
Seed Germination ◽  
Germination Rate ◽  
Germination Percentage ◽  
Douglas Fir ◽  
Native Plant ◽  
Temperature Regimes ◽  
The Mean ◽  
Lower Temperature ◽  
Fluctuating Temperatures ◽  
Germination Requirements

Thompson, D. J. 2014. Relating germination requirements of timber milkvetch to seral stage in the Interior Douglas-fir zone. Can. J. Plant Sci. 94: 723–726. Germination of timber milkvetch (Astragalus miser var. serotinus) seeds was studied to determine if it is an early or late seral species. Seeds were collected from a native plant population and those having a dark seed coat were selected. Germination tests were run in the light or dark and under three temperature regimes: low (constant 10°C), high (constant 25°C), and alternating (25°C day and 10°C night). Germination occurred over a protracted period with new germinants up to 90 d at the lowest temperature. Germination was not affected by light. Germination rate was greater at 25°C than 10°C, while fluctuating temperatures (25 and 10°C alternating every 12 h) reduced germination rate to that at the lower temperature. Days to 50% germination was a more sensitive indicator, with the mean for the fluctuating temperatures falling between those continuous to the high and low temperature. Final germination percentage was reduced at 10°C compared with 25°C, but not with fluctuating temperatures. Timber milkvetch seed germination did not respond to light or fluctuating temperatures, adding to a body of evidence that it is a late seral species.

scholarly journals FEATURES SEED REPRODUCTION OF HEDYSARUM GRANDIFLORUM PALL. EX SITU AND IN VITRO

2020 ◽  
pp. 286-293
Author(s):  
N. A. Suprun ◽  
◽  
E. V. Malaeva ◽  
S. A. Shumikhin ◽  
◽  
...  
Keyword(s):  
Seed Germination ◽  
Germination Rate ◽  
Natural Populations ◽  
Seed Vigor ◽  
Ex Situ ◽  
Optimal Temperature ◽  
High Productivity ◽  
Seed Reproduction ◽  
Optimal Mode

Hedysarum grandiflorum samples were collected from 7 natural populations of the Volgograd, Samara and Lugansk People's Republic and the features of seed reproduction were studied under ex situ and in vitro conditions. The optimal temperature for seed germination and the dependence of germination and seed vigor on the storage were revealed. We observed the maximum germination rate in the scarified seeds of H. grandiflorum of 2018 collection and it was equal to 70%.It was found that the seed germina-tion and seed vigor are low and quickly decrease with years of storage, while their scarification allows to increase these indicators. It is noted that the relatively low germination of the studied seeds is leveled by the rather high productivity of species in general. The optimal mode of sterilization of H. grandiflorum seeds was experimentally determined - 10% Lysofornin® 3000 solution for 5 minutes. The percentage of sterile seedlings was 60%.

Effect of salinity, light, and temperature on germination in Allenrolfea occidentalis

1999 ◽  
Vol 77 (2) ◽  
pp. 240-246 ◽  
Author(s):  
Bilquees Gul ◽  
Darrell J Weber
Keyword(s):  
Seed Germination ◽  
Salt Marshes ◽  
Germination Rate ◽  
Distilled Water ◽  
Western North America ◽  
Temperature Regimes ◽  
The Family ◽  
Nacl Concentration ◽  
Perennial Shrub ◽  
Allenrolfea Occidentalis

Allenrolfea occidentalis (S. Wats.) Kuntze, a halophytic perennial shrub in the family Chenopodiaceae, is widely distributed in inland salt marshes and salt playas of western North America. Experiments were conducted to determine the effects of NaCl, light, and temperature on seed germination and their recovery of germination from saline conditions after being transferred to distilled water. Seeds of A. occidentalis were germinated at various temperatures (5:15, 10:20, 10:30, 15:25, 20:30, and 25:35°C (night:day)) and salinities (0, 200, 400, 600, 800, and 1000 mM NaCl) in a 12 h light : 12 h dark photoperiod and in 24 h darkness. Increases in NaCl concentration progressively inhibited seed germination, and this inhibition was greater in the dark than in light. No seeds germinated at concentrations higher than 800 mM NaCl. Cooler temperatures significantly inhibited germination in all treatments, while regimes of high night (25°C) and high day (35°C) temperatures showed higher germination. Rate of germination decreased with an increase in salinity. Germination rate was higher at 25:35°C and lower at 5:15°C. Seeds were transferred from salt solutions to distilled water after 20 days, and those from high salinities recovered quickly at all temperature regimes. Recovery germination percentages at higher salinities varied from 51 to 100% at various temperatures, but recovery of germination of seeds from salt stress was significantly affected by temperature regime.Key words: Allenrolfea occidentalis, halophyte, light, recovery of seed germination, salt playas, thermoperiod, Utah.

scholarly journals Seed Source and Quality Influence Germination in Purple Coneflower [Echinacea purpurea (L.) Moench.]

HortScience ◽  
1994 ◽  
Vol 29 (12) ◽  
pp. 1443-1444 ◽  
Author(s):  
N. Wartidiningsih ◽  
R.L. Geneve
Keyword(s):  
Seed Germination ◽  
Dry Weight ◽  
Echinacea Purpurea ◽  
Germination Percentage ◽  
Physiological Maturity ◽  
Seed Sources ◽  
Purple Coneflower ◽  
Temperature Regimes ◽  
Two Temperature ◽  
Effect Of Light

Six seed lots of purple coneflower were purchased from four commercial seed sources and evaluated for germination in either light or darkness in combination with two temperature regimes (constant 27C vs. alternating 30C for 8 hours and 20C for 16 hours). Seed lot differences accounted for the majority of variation, with two seed lots exhibiting high (81% to 91%) germination and the remaining seed lots having 39% to 66% germination. There was no effect of light on germination, regardless of the seed lot. However, alternating temperatures improved germination in one of the low-germination seed lots. Seed size and inflorescence position did not affect seed germination. Seed harvested at physiological maturity (maximum seed dry weight), but before drying had occurred, had a higher germination percentage than seeds harvested after desiccation, and they maintained a higher germination percentage even after 1 year in storage.

scholarly journals Environmental Factors Influencing Germination in Seeded Seashore Paspalum

HortScience ◽  
2006 ◽  
Vol 41 (5) ◽  
pp. 1330-1331 ◽  
Author(s):  
J.S. Shin ◽  
P. Raymer ◽  
W. Kim
Keyword(s):  
Seed Germination ◽  
Environmental Factors ◽  
Germination Rate ◽  
Warm Season ◽  
Field Application ◽  
Effect Of Temperature ◽  
Seashore Paspalum ◽  
Realistic Condition ◽  
Alternating Temperature ◽  
Effect Of Light

Seashore paspalum (Paspalum vaginatum O. Swartz) is a perennial warm-season grass that is rapidly gaining popularity for use on golf courses and athletic fields. The first seeded cultivar of seashore paspalum was recently developed. Seed from the pilot production of this cultivar harvested in Oregon during 2002 by Turf-Seeds, Inc. demonstrated a high level of apparent seed dormancy with a tetrazolium test of 91% but a germination rate of less than 5% at room temperature. This seed was used in laboratory experiments to determine the effect of a number of environmental factors on germination response in this new turf species. Treatment factors are germination media, constant and alternating (night/day) temperatures, and light. A strong and significant effect of temperature on germination was observed. Total germination was increased at higher temperatures. At the same daytime temperature, seed germination under alternating temperature was better than germination at constant temperature. The effect of light on germination was significant at 20, 25, 30, 20/35 °C in water and at 25/35 °C in 0.2% KNO3 germination media. However, the effect of light on germination in KNO3 media was not significant at 35 °C constant and 20/30 °C alternating temperatures. Alternating temperature used in conjunction with KNO3 media reduced the requirement for light. The use of 0.2% KNO3 rather than water as the germination media increased germination in most temperature and light treatments. Based on our results, maximum germination percentage was obtained when seed was germinated at 35 °C constant or 20/35 °C alternating temperature. However, when we consider field application, 25/35 °C with light is more realistic condition in field. Therefore, recommended seed germination test condition is at 25/35 °C with KNO3 treatment.

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