Effects of temperature and oxygen on seed germination and seedling growth in sunflower (Helianthus annuus L.)

1991 ◽  
Vol 31 (2) ◽  
pp. 193-200 ◽  
Author(s):  
C. Gay ◽  
F. Corbineau ◽  
D. Côme
Keyword(s):  
Seed Germination ◽  
Helianthus Annuus ◽  
Seedling Growth ◽  
Helianthus Annuus L ◽  
Effects Of Temperature

scholarly journals TEMPERATURE - GERMINATION RESPONSES OF SUNFLOWER (Helianthus annuus L.) GENOTYPES / GERMINACION COMO REACCION A LA TEMPERATURA EN LOS GENOTIPOS DEL GIRASOL (Helianthus annuus L.) / GERMINATION - RÉACTION À LA TEMPÉRATURE DANS LES GÉNOTYPES DE TOURNESOL (Helianthus annuus L.)

Helia ◽  
2000 ◽  
Vol 23 (33) ◽  
pp. 97-104
Author(s):  
F.M. Khalifa ◽  
A.A. Schneiter ◽  
E.I. El Tayeb
Keyword(s):  
Seed Germination ◽  
Helianthus Annuus ◽  
Maximum Rate ◽  
Germination Rate ◽  
Thermal Time ◽  
Large Temperature ◽  
Climatic Zones ◽  
Helianthus Annuus L ◽  
Wide Range ◽  
Cardinal Temperature

SUMMARY Seed germination of six sunflower (Helianthus annuus L.) hybrids was investigated across a range of eleven constant temperatures between 5°C and 45°C. Large temperature differences in germination rate 1/t (d-1), cardinal temperature (°C) and thermal time θ (°cd) were observed among hybrids. Base temperatures (Tb) varied between 3.3°C and 6.7°C whereas maximum germination temperatures (Tm) varied between 41.7°C and 48.9°C. Final germination fraction was attained at 15°C - 25°C whereas the maximum rate of germination was attained at 30.4°C - 35.6°C. The maximum germination rate of hybrid USDA 894, the cultivar with the slowest germination rate, was only 50% of that of hybrid EX 47. The low Tb and high Tm of sunflower appear to be one of the factors which explain the successful adaptation of sunflower to a wide range of temperature. These findings are discussed in relation to the origin of the crop and its wide adaptations in diverse habitats and climatic zones.

scholarly journals Seed Germination and Physiological Response of Sunflower (Helianthus annuus L.) Cultivars under Saline Conditions

2018 ◽  
Vol 75 (1) ◽  
pp. 4
Author(s):  
Carmen BEINSAN ◽  
Renata SUMALAN ◽  
Giancarla VELICEVICI ◽  
Adriana CIULCA ◽  
Radu SUMALAN
Keyword(s):  
Seed Germination ◽  
Helianthus Annuus ◽  
Dry Matter ◽  
Saline Stress ◽  
Free Proline ◽  
Radicle Growth ◽  
Helianthus Annuus L ◽  
Control Seed ◽  
Germination Process

The purpose of the experiment was to highlight the germination of sunflower seeds affected by the presence of saline stress and the identification of tolerant genotypes. The biological material was represented by sunflower cvs. (Helianthus annuus L.): Coril, Select, Santiago and Fundulea-206. To simulate the saline conditions, germination solutions of sodium chloride (NaCl) were used with concentrations corresponding to the osmotic pressures -6 and -10 atm and the control seed hydration was performed with distilled water. Determination of seed germination, growth of seedling, percentage of plumules dry matter, chlorophyll content and free proline were performed. The experimental data obtained suppose the existence in the assimilation apparatus of sunflowers seedling subjected to stress a competitive chlorophyll/free proline biosynthesis processes. The experimental results regarding the effect of salinity on seed germination and seedling growth revealed important differences between genotypes. The radicle growth in the germination process were strongly affected by saline excess, with significant differences between cultivars. Saline stress results in significant reductions in the amount of chlorophyll, and high levels of free proline. It can be observed that with the increase of the stress level the percentage of the dry matter increases, indicating an accentuated water deficit.

scholarly journals A Salt Tolerance Evaluation Method for Sunflower (Helianthus annuus L.) at the Seed Germination Stage

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Wenhui Li ◽  
Huizhen Zhang ◽  
Youling Zeng ◽  
Lijun Xiang ◽  
Zhonghua Lei ◽  
...  
Keyword(s):  
Salt Tolerance ◽  
Seed Germination ◽  
Helianthus Annuus ◽  
Evaluation Method ◽  
Helianthus Annuus L ◽  
Germination Stage

scholarly journals Effects of sodium chloride on germination and seedling growth of Sunflower (Helianthus annuus L.)

2018 ◽  
Vol 7 (1) ◽  
pp. 35-44
Author(s):  
FM Tonmoy Chowdhury ◽  
MA Halim ◽  
Feroza Hossain ◽  
Nahid Akhtar
Keyword(s):  
Sodium Chloride ◽  
Helianthus Annuus ◽  
Seedling Growth ◽  
Germination Percentage ◽  
Water Control ◽  
Helianthus Annuus L ◽  
Early Seedling Growth ◽  
Nacl Concentration ◽  
Early Seedling ◽  
Germination Indices

The response of BARI Sunflower-2 (Helianthus annuus L.) to sodium chloride (NaCl) at germination and early seedling growth was investigated. The seeds and seedlings of sunflower were treated with a series of eight different concentrations of NaCl viz 25, 50, 75, 100, 125, 150, 175 and 200 mM and distilled water (control) and were allowed to grow under plate culture condition. The results showed that the highest salinity concentration (200 mM NaCl) remarkably decreased the germination percentage, germination index and speed of germination of BARI Sunflower-2. Fresh and dry masses of both shoot and root were significantly reduced at a 25-200 mM NaCl solution. Significant reductions of shoot and root length were also noted with the increase of NaCl concentration. The results also illustrate that up to 50 mM NaCl concentration, all of the germination indices and fresh and dry biomass were withstand more than 70%. Thus the present study concluded that the BARI Sunflower-2 could be cultivated in moderately saline soil.Jahangirnagar University J. Biol. Sci. 7(1): 35-44, 2018 (June)

Use of immature seed germination technique as an alternative to in vitro culture of sunflower (Helianthus annuus L.) embryos

Euphytica ◽  
1996 ◽  
Vol 91 (1) ◽  
pp. 1-3 ◽  
Author(s):  
Adriana Torresán ◽  
Juan Kesteloot ◽  
Fernando Castaño ◽  
Raúl Rodríguez ◽  
Mabel Colabelli
Keyword(s):  
Seed Germination ◽  
In Vitro Culture ◽  
Helianthus Annuus ◽  
Immature Seed ◽  
Helianthus Annuus L
Sign in / Sign up

Export Citation Format

Share Document