Seasonal cycles in the germination capacity of buried seeds of some Leguminosae (<i>Fabaceae</i>)

Assche, Jozef A. Van; Debucquoy, Katrien L. A.; Rommens, Wouter

doi:10.1046/j.1469-8137.2003.00744.x

Cited by 162 publications

(168 citation statements)

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“…In European heath in the Mediterranean, daily temperature cycles occurring in vegetation gaps promoted germination in the gorse Ulex parviflorus (Baeza and Roy 2008). In temperate European ecosystems, Van Assche et al (2003) found that slight seasonal changes in daily temperature fluctuations were key to breaking physical dormancy of many herbaceous legumes. Other evidences have been highlighted from studies on invasive species, such as the gap recruitment displayed by the tropical shrub Mimosa pigra (Lonsdale 1993) and the European gorse, U. europaeus in New Zealand (Ivens 1983).…”

Section: Discussionmentioning

confidence: 99%

Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species

et al. 2010

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M. (2010). Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species. Australian Journal of Botany, 58 (7), 539-545.Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species AbstractIn addition to direct fire cues such as heat, smoke and charred wood, the passage of fire leads indirectly to changes in environmental conditions which may be able to break physical dormancy in hard-coated seeds. After a fire, the open canopy and the burnt material lying on the surface alter the thermal properties of the soil, resulting in elevated soil temperatures for long periods of time. We simulated daily temperature regimes experienced at different depths of soil profile after a summer fire. Our aim was to determine whether these temperature regimes and the duration of exposure (5, 15 and 30 days) play an important role breaking physical seed dormancy in six legumes from south-eastern Australia. Our results showed that simulated temperature regimes break seed dormancy. This effect is specially pronounced at temperatures that are expected to occur near the soil surface (0-2 cm depth). The duration of exposure interacts with temperature to break dormancy, with the highest germination rates reached after the longest duration and highest temperatures. However, the germination response varied among species. Therefore, this indirect post-fire cue could play a role in the regeneration of plant communities, and could stimulate seedling emergence independent of direct fire cues as well as in interaction with direct cues. © 2010 CSIRO. Abstract. In addition to direct fire cues such as heat, smoke and charred wood, the passage of fire leads indirectly to changes in environmental conditions which may be able to break physical dormancy in hard-coated seeds. After a fire, the open canopy and the burnt material lying on the surface alter the thermal properties of the soil, resulting in elevated soil temperatures for long periods of time. We simulated daily temperature regimes experienced at different depths of soil profile after a summer fire. Our aim was to determine whether these temperature regimes and the duration of exposure (5, 15 and 30 days) play an important role breaking physical seed dormancy in six legumes from south-eastern Australia. Our results showed that simulated temperature regimes break seed dormancy. This effect is specially pronounced at temperatures that are expected to occur near the soil surface (0-2 cm depth). The duration of exposure interacts with temperature to break dormancy, with the highest germination rates reached after the longest duration and highest temperatures. However, the germination response varied among species. Therefore, this indirect post-fire cue could play a role in the regeneration of plant communities, and could stimulate seedling emergence independent of direct fire cues as well as in interaction with direct cues.

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Section: Discussionmentioning

confidence: 99%

Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species

et al. 2010

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“…Legume seeds are known to have physical dormancy (Baskin, 2003;Van Assche et al, 2003;Venier et al, 2012;Gehan-Jayasuriya et al, 2013), as Mimosa species (Martínez-Pérez et al, 2006;Gehan-Jayasuriya et al, 2013). Prior to any assay, all Mimosa seeds were washed with commercial detergent (3 g/100 ml water/3 min) (Camargo-Ricalde and Grether, 1998).…”

Section: Experimental Designmentioning

confidence: 99%

Effect of scarification and temperature on seed germination of two Mexican species of Mimosa (Leguminosae-Mimosoideae)

et al. 2015

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It has been considered that Mimosa aculeaticarpa var. aculeaticarpa and M. luisana have the potential to restore temperate and semi-arid environments, respectively. Mature seeds were collected from eight mother plants per taxon to determine the effects of scarifi cation and temperature on seed germination of both taxa, and to defi ne the optimum temperature for germination. To obtain a representative sample of each taxon, seeds with the same weight and size were mixed. Five replicates of 20 seeds each (100 seeds per taxon/temperature, plus the control) were established. The seeds were mechanically scarifi ed and incubated under controlled conditions: 5 to 45 °C with 5 °C intervals, and a 12h light/12h darkness photoperiod. Results showed that scarifi cation and temperature were signifi cant factors in seed germination. In both taxa, germination was epigeal and phanerocotylar. The highest seed germination percentages were obtained when seeds were scarifi ed. 88 % of seeds of M. aculeaticarpa var. aculeaticarpa germinated at 25 °C. Hundred percent of seeds of M. luisana germinated at 30 °C. The optimum temperature for germination of seeds of both taxa was established at 25 °C. Mimosa taxa differ in the germination rate: M. luisana germinated at 6.6 seeds/day and M. aculeaticarpa var. aculeaticarpa at 3.4 seeds/day. Overall results suggest that, for both taxa, an increase or decrease in temperature will not inhibit seed germination, supporting the recommendation to use these plants for reforestation, as part of environmental restoration projects in temperate and semi-arid Mexican regions. Key words: arid tropical scrub, conservation, restoration, temperate forest.Resumen: Mimosa aculeaticarpa var. aculeaticarpa y M. luisana son taxa con potencial para la restauración ambiental. Se evaluaron los efectos de la escarifi cación y la temperatura en la germinación de semillas de ambos taxa y se defi nió la temperatura óptima de germinación, se colectaron semillas maduras de ocho individuos por especie. Las semillas (igual peso y tamaño) se mezclaron para obtener una muestra compuesta por taxon. Se establecieron cinco repeticiones de 20 semillas por taxon (100 semillas por taxon, por temperatura, más el control). Las semillas fueron escarifi cadas mecánicamente, realizando un corte en el extremo opuesto al eje del embrión e incubadas en un gradiente de 5 a 45 ºC, con intervalos de 5 °C y un fotoperíodo de 12h luz/12h oscuridad. Los resultados indican que la escarifi cación y la temperatura son factores signifi cativos para la germinación de las semillas. En ambos taxa, la germinación fue epígea y fanerocotilar. Los mayores porcentajes de germinación se obtuvieron cuando las semillas fueron escarifi cadas. Mimosa aculeaticarpa var. aculeaticarpa logró el 88 % de germinación a 25 °C; mientras que M. luisana alcanzó 100 % a 30 °C; sin embargo, para ambos taxa la temperatura óptima de germinación fue de 25 °C. La tasa de germinación difi ere, en M. luisana se registraron 6.6 semillas/día; mientras que en M. aculeati...

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“…Under natural conditions, it has been suggested that exposition of seeds to high or fluctuating temperatures is the responsible for seed dormancy alleviation (Vazquez-Yanes & Orozco-Segovia, 1982;Van Assche et al, 2003), whereas in laboratory conditions, the mechanical, thermal and chemical scarification, would be the most effective dormancy-breaking treatments (Baskin & Baskin, 2014). In this case, wet heat (≥ 80 °C), acid and mechanical scarification were effective methods to break seed dormancy, depending on the species.…”

Section: Discussionmentioning

confidence: 99%

Dormición física de las semillas de leguminosas nativas de Argentina.

Galíndez¹,

Ceccato²,

Malagrina³

et al. 2016

Bol. Soc. Argent. Bot.

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Summary:Leguminosae is a family with high value of use for food, medicine, forage, ornamental and restoration ecology purposes. One obstacle for the use and management of many legume species is the presence of seeds with physical dormancy. Here, we evaluated the presence of physical dormancy in nine native species of Argentina and identified possible methods for breaking dormancy. Caesalpinia gilliesii, Geoffroea decorticans, and Prosopis alpataco have seeds with no physical dormancy, whereas Crotalaria incana, C. pumila, C. stipularia, Desmanthus virgatus, Galactia texana, and Senna aphylla have seeds with physical dormancy. The most effective methods for breaking physical dormancy were mechanical and wet heat (100°C) scarification for Crotalaria spp.; mechanical, acid (20 and 30 min) and wet heat scarification (80 and 100°C) for D. virgatus; mechanical scarification for G. texana and mechanical and all acid scarification treatments for S. aphylla. These results contribute to the knowledge of the germination biology for these species, and are of particular interest for their propagation in glasshouse and for restoration and conservation programs.Key words: Leguminosae, physical dormancy, scarification, seed germination.Resumen: Dormición física de las semillas de leguminosas nativas de Argentina. Leguminosae es una familia con un alto valor de uso como alimento, forraje, medicina y para fines ornamentales y de restauración ecológica. Uno de los principales problemas para el uso y manejo de muchas de estas especies es la presencia de semillas con dormición física. En el presente trabajo se evaluó la presencia de dormición física en nueve especies nativas de Argentina y los posibles métodos que permitan la salida de este estado. Las semillas de Caesalpinia gilliesii, Geoffroea decorticans y Prosopis alpataco presentaron semillas sin dormición, mientras que las semillas de Crotalaria incana, C. pumila, C. stipularia, Desmanthus virgatus, Galactia texana y Senna aphylla presentaron dormición física. Los métodos más eficientes para romper la dormición física de las semillas de las especies del género Crotalaria fueron la escarificación mecánica y el calor húmedo (100°C); la escarificación mecánica, la química (ácido sulfúrico: 20 y 30 minutos) y la escarificación con calor húmedo (80 y 100°C) para D. virgatus; la escarificación mecánica para G. texana; y la escarificación mecánica y la química (ácido sulfúrico: 10, 20 y 30 minutos) para S. aphylla. Estos resultados contribuyen al conocimiento de la biología de las semillas de estas especies y a su utilización en programas de propagación de plantas en invernaderos, restauración ecológica y conservación.Palabras clave: Dormición física, escarificación, germinación, Leguminosae.

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Seasonal cycles in the germination capacity of buried seeds of some Leguminosae (Fabaceae)

Cited by 162 publications

References 24 publications

Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species

Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species

Effect of scarification and temperature on seed germination of two Mexican species of Mimosa (Leguminosae-Mimosoideae)

Dormición física de las semillas de leguminosas nativas de Argentina.

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