Ecophysiological requirements on seed germination of a Mediterranean perennial grass (Stipa tenacissima L.) under controlled temperatures and water stress

Krichen, Khouloud; Mariem, H. Ben; Chaïeb, Mohamed

doi:10.1016/j.sajb.2014.07.008

Cited by 47 publications

(20 citation statements)

References 51 publications

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“…Our results are also comparable to those of the perennial grass from semi‐arid Mediterranean grasslands, Stipa tenacissima , (Krichen et al . ), which germinated most between 10–20 °C and was limited by water potentials lower than −0.8 MPa. However, even though our species are all native winter annuals from ruderal habitats, this study suggests that there was no single, general response of winter annual forbs to environmental cues.…”

Section: Discussionmentioning

confidence: 99%

Hydrothermal thresholds for seed germination in winter annual forbs from old‐field Mediterranean landscapes

Frischie

Fernández-Pascual

Ramírez³

et al. 2018

Plant Biol J

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Under Mediterranean climates with dry-hot summers and cool-wet winters, many forbs with potential for habitat restoration are winter annuals, but there is little information about their germination. We performed laboratory germination experiments on 13 ruderal dicots native to Andalusia (southern Spain). We measured the germination of recently harvested seeds from natural populations across nine temperature treatments (from 5 to 35 °C, constant and alternate); two storage periods; and eight water stress treatments (from 0 to -1.0 MPa). We then calculated the hydrothermal thresholds for seed germination. Final germination ranged from 0-100% and results were mixed in response to temperature. Base temperature was below 6 °C, optimal temperature was around 14 °C and the ceiling temperature around 23 °C. For five species, 10 months of storage improved total germination, indicating a dormancy-breaking effect, but the other species did not respond or had their germination reduced. All species were relatively tolerant to water stress, with base water potential ranging from -0.8 to -1.8 MPa. Our results suggest that hydrothermal germination thresholds, rather than physiological dormancy, are the main drivers of germination phenology in annual forbs from Mediterranean semi-dry environments. The variation in germination responses of these forb species differs from winter annual grasses, but their seeds are all suitable for being stored before restoration.

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Section: Discussionmentioning

confidence: 99%

Hydrothermal thresholds for seed germination in winter annual forbs from old‐field Mediterranean landscapes

Frischie

Fernández-Pascual

Ramírez³

et al. 2018

Plant Biol J

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“…Our results were similar with previous reports on the germination of other species belonging to Lamiaceae family including those of Abbad et al (2011) who reported a decrease in germination capacity of Thymus maroccanus and Thymus broussonetii seeds at -0.53 MPa. Krichen et al (2014) reported that the germination of Stipa tinaciccima, a plant distributed in semi-arid climate areas (similar to B. hirsuta), was also very sensitive to a range of water potential from 0 to -0.8 MPa. Plants adapted to arid conditions such as B. hirsuta, might have the ability to absorb suffi cient water amounts during seed germination from their surroundings even when there is a water restriction.…”

Section: Discussionmentioning

confidence: 99%

Germination responses of Ballota hirsuta seeds under conditions of temperature, salinity and water stress

Dadach

Mehdadi

2018

Hellenic Plant Protection Journal

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SummaryTemperature, salinity and water deficit can be major environmental constraints which reduce distribution of indigenous plants in the Mediterranean region. Laboratory experiments were carried out to assess the effect of temperature, sodium chloride (NaCl) and polyethylene glycol 6000 (PEG) on germination ofBallota hirsutaseeds. The germination responses of seeds were determined over a wide range of temperature (5 to 35°C), salinity (0 to 136 mM NaCl) and water stress (0 to −1 MPa PEG). Germination percentage was optimum at 20°C (78%), and showed a decline at lower (5°C, 25%) or higher (30°C, 18%) temperature values and total inhibition of germination at 35°C. Under salinity and water stress conditions, there was a significant deterioration in most germination parameters such as lower final germination percentage, increased mean germination times and lower germination rates.

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“…DOI: 10.1515/arls-2018-0021 ARLS, 2 (1), 2018, 11-15 Marrubium vulgare, Sideritis incana and Stachys ocymastrum (Lamiaceae) are Mediterranean semi-arid grasses which are characterized by therapeutic effects and mainly used in traditional medicines [7,8]. In fact, distribution of grasses in semi-arid regions is very unpredictable, with rite of colonization concomitantly linked to the temperature fluctuations, rainfall means and soil salinity [9,10]. Moreover, Master germination patterns could approve basic knowledge about ecological requirements and can be imperatively exploited for project of conservation, restoration and soil management.…”

Section: Introduction mentioning

confidence: 99%

Evaluation of the Tolerance to Temperature and Salinity on Seed Germination of Three Lamiacea from Algerian Scrubland

Dadach

Mehdadi

Adjouj

2018

Advanced Research in Life Sciences

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Global warming and soil salinity are major constraints threat speared of Mediterranean endogenous flora, however little is known about the effect of these phenomena on seed germination patterns, particularly in Algeria. Germination test under laboratory controlled conditions had been carried out using seeds of Marrubium vulgare, Sideritis incana and Stachys ocymastrum. Seeds were submitted at temperatures of 5, 10, 15, 20, 25, 30 and 35 °C, after that and within optimum temperatures, various sodium chloride (NaCl) concentrations of 0, 34, 68, 102 and 136 mM were set to evaluated salinity effect. Germination was more satisfactory on temperatures ranged between 15 and 25 °C. Whereas, increased or decreased temperatures from the optimum bring to germination fall. High seed germination capacity had been showed on non-saline solution. While, germination had depressed by enhanced NaCl solution up to 136 Mm in which Final Germination Percentage are either significantly decreased (for S. ocymastrum seeds 18% germination) or absolutely inhibited (for M. vulgare and S. incana seeds), as well Initial Germination Day are delayed. Overall, data showed that germination patterns response varies among species, given that seed germination is remarkably limited by extremes temperatures and salinity.

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Ecophysiological requirements on seed germination of a Mediterranean perennial grass (Stipa tenacissima L.) under controlled temperatures and water stress

Cited by 47 publications

References 51 publications

Hydrothermal thresholds for seed germination in winter annual forbs from old‐field Mediterranean landscapes

Hydrothermal thresholds for seed germination in winter annual forbs from old‐field Mediterranean landscapes

Germination responses of Ballota hirsuta seeds under conditions of temperature, salinity and water stress

Evaluation of the Tolerance to Temperature and Salinity on Seed Germination of Three Lamiacea from Algerian Scrubland

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