Germination variability and the effect of various pre-treatment on germination in the perennial spurge Euphorbia nicaeensis All.

Narbona, Eduardo; Ortiz, Pedro; Arista, Montserrat

doi:10.1016/j.flora.2006.02.004

Cited by 16 publications

(10 citation statements)

References 56 publications

(67 reference statements)

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“…that were preheated at 100 C for 1 and 5 min germinated in the same proportions as the control group. The seeds that were preheated at 120 C for 5 min had lower germination, but still higher than 40% for both populations, indicating that many seeds could germinate after a fire (Narbona et al, 2006). Daws et al (2007) found a reduction on seed viability of seeds from six Crassulaceae species exposed at 103 C for 17 h. Seeds of other species have not been affected by exposure to high temperatures.…”

Section: Resultsmentioning

confidence: 95%

Seed germination of Southern Chihuahuan Desert plants in response to elevated temperatures

Pérez-Sánchez

Jurado

Chapa‐Vargas

et al. 2011

Journal of Arid Environments

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Section: Resultsmentioning

confidence: 95%

Seed germination of Southern Chihuahuan Desert plants in response to elevated temperatures

Pérez-Sánchez

Jurado

Chapa‐Vargas

et al. 2011

Journal of Arid Environments

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“…We also tested the effect of fluctuating temperatures, and we (Best, Bowes, Thomas, & Maw, 1980;Brecke, 1995;Narbona, Ortiz, & Arista, 2006). It is possible that this phenomenon can be related to their large seeds or processes of seed dispersal.…”

Section: Discussionmentioning

confidence: 99%

Temperature and storage time strongly affect the germination success of perennial Euphorbia species in Mediterranean regions

Cristaudo

Catara

Mingo

et al. 2019

Ecology and Evolution

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This study aims to explore the effect of environmental factors (temperature, light, storage time) on germination response and dormancy patterns in eight Mediterranean native wildplants, belonging to the Euphorbia L. genus. In detail, we considered E. amygdaloides subsp. arbuscula, E. bivonae subsp. bivonae, E. ceratocarpa, E. characias, E. dendroides, E. melapetala, E. myrsinites, and E. rigida. We collected seeds from natural plant populations and performed germination assays in climatic chambers at seven constant temperatures (from 5 to 35°C, with 5°C increments), and four fluctuating temperature regimes (8/15, 8/20, 8/25, and 8/30°C, with a 12/12 hr thermoperiod). Germination assays were set up both in dark (D) and in light/dark conditions (L/D, 12/12 hr photoperiod), after short and long seed storage (SS around 30 days and LS around 150 days). For all these species, except E. amygdaloides subsp. arbuscula, results show that the final germinated proportions were improved by a long storage period (>150 days), which supports the existence of nondeep physiological dormancy. Optimal temperature levels ranged from 14.3 to 21.3°C and base temperatures ranged from 5.6 to 12.1°C, while ceiling temperatures from 25.6 to 34.7°C. For none of these species, germinations were favored by an alternating daily temperature regime, while in several instances, germinations were quicker and more complete in darkness, than in an alternating light/dark regime. In some instances, extreme temperature levels (5 and 30°C) induced dormancy and germinations did not resume when seeds were exposed at optimal temperature levels. Results are discussed in terms of the dynamics of emergences and how this might be affected by climate changes.

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“…These differences in biomass allocation point also to the species considerable phenotypic plasticity and its ability to cope with stress meant by high light and low water availability. Since Euphorbia seeds can germinate under both light and dark conditions ( Narbona et al, 2006 ), seeds would germinate easily under shrubs and individuals would grow better thanks to the high water and nutrient availability. Individuals in open areas, however, must cope with drier soils, higher temperatures and lower soil nutrient content, investing relatively more into reproductive organs likely to compensate for higher juvenile or adult mortality ( Al Samman et al, 2001 ).…”

Section: Discussionmentioning

confidence: 99%

Functional Plant Types Drive Plant Interactions in a Mediterranean Mountain Range

et al. 2016

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Shrubs have positive (facilitation) and negative (competition) effects on understory plants, the net interaction effect being modulated by abiotic conditions. Overall shrubs influence to great extent the structure of plant communities where they have significant presence. Interactions in a plant community are quite diverse but little is known about their variability and effects at community level. Here we checked the effects of co-occurring shrub species from different functional types on a focal understory species, determining mechanisms driving interaction outcome, and tested whether effects measured on the focal species were a proxy for effects measured at the community level. Growth, physiological, and reproductive traits of Euphorbia nicaeensis, our focal species, were recorded on individuals growing in association with four dominant shrub species and in adjacent open areas. We also recorded community composition and environmental conditions in each microhabitat. Shrubs provided environmental conditions for plant growth, which contrasted with open areas, including moister soil, greater N content, higher air temperatures, and lower radiation. Shrub-associated individuals showed lower reproductive effort and greater allocation to growth, while most physiological traits remained unaffected. Euphorbia individuals were bigger and had more leaf N under N-fixing than under non-fixing species. Soil moisture was also higher under N-fixing shrubs; therefore soil conditions in the understory may counter reduced light conditions. There was a significant effect of species identity and functional types in the outcome of plant interactions with consistent effects at individual and community levels. The contrasting allocation strategies to reproduction and growth in Euphorbia plants, either associated or not with shrubs, showed high phenotypic plasticity and evidence its ability to cope with contrasting environmental conditions.

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Germination variability and the effect of various pre-treatment on germination in the perennial spurge Euphorbia nicaeensis All.

Cited by 16 publications

References 56 publications

Seed germination of Southern Chihuahuan Desert plants in response to elevated temperatures

Seed germination of Southern Chihuahuan Desert plants in response to elevated temperatures

Temperature and storage time strongly affect the germination success of perennial Euphorbia species in Mediterranean regions

Functional Plant Types Drive Plant Interactions in a Mediterranean Mountain Range

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