Seed mass and germination in Asteraceae species of Argentina

Galíndez, Guadalupe; Ortega–Baes, Pablo; Daws, Matthew I.; Sühring, Silvia; Scopel, Ana L.; Pritchard, H. W.

doi:10.15258/sst.2009.37.3.27

Cited by 20 publications

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“…1). Cabe recordar que la duración del período de oscuridad fue fijada para cada temperatura al momento en que se completó la germinación del correspondiente tratamiento L. La dependencia a la luz es frecuente encontrarla en especies que poseen semillas de muy baja masa (Jankowska-Blaszczuk & Daws 2007;Galíndez et al 2009;Koutsovoulou et al 2014) y es característica del género Baccharis (Karrfalt & Olson 2008). Esta respuesta positiva de la germinación a la iluminación fue encontrada en aquenios de B. dracunculifolia subsp.…”

Section: Resultados Y Discusión Prueba Germinación (Pg)unclassified

“…Esta respuesta positiva de la germinación a la iluminación fue encontrada en aquenios de B. dracunculifolia subsp. dracunculifolia recolectados en la provincia de Entre Ríos (31°55ʼS; 58°17ʼO, Galíndez et al 2009) tanto con un régimen térmico alternante (8 horas a 25°C y 16 horas a 10°C) como bajo uno constante a 20°C. Sin embargo, Gomes & Fernandes (2002) encontraron que, para la misma subespecie, a 15°C la germinación ocurría independientemente de la luz con muy altos valores porcentuales, mientras que a 20; 25 y 30°C fue significativamente mayor en luz que en oscuridad, por lo que concluyeron sobre la existencia de una interacción entre la temperatura y la luz.…”

Section: Resultados Y Discusión Prueba Germinación (Pg)unclassified

“…dracunculifolia, en particular o junto con otras especies del género, tanto en la Argentina como en Brasil. Las publicaciones abarcan temáticas como germinación (Gomes & Fernandes 2002), alelopatía (Soares Gusman et al 2008), fenología (Espírito-Santo et al 2003), insectos asociados (Espírito-Santo & Fernandes 1998; Fagundes & Fernandes 2011), anatomía de tallo y hoja (Budel et al 2004), respuesta de supervivencia y crecimiento de plántulas a gradiente de nutrientes (Negreiros et al 2014), respuesta al fuego (Biganzoli et al 2009;Galíndez et al 2009;Galíndez et al 2013), entre otras. Por el contrario, son escasas las investigaciones sobre B. dracunculifolia subsp.…”

Section: Introductionunclassified

“…Sin embargo, estos parámetros sólo pueden ser evaluados cuando las semillas no presentan dormición (Batlla & Benech-Arnold 2015). Entre los numerosos tipos de dormición (Baskin & Baskin 2004;Finch-Savage & Leubner-Metzger 2006) se encuentra la que responde a la luz, ampliamente reconocida como una señal de ambiente favorable a la germinación para especies cuyas semillas poseen un bajo nivel de reservas, como es el caso de B. medullosa y B. dracunculifolia (Galíndez et al 2009).…”

Section: Introductionunclassified

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Germinación de Baccharis dracunculifolia subsp. tandilensis: caracterización basada en la temperatura, la luz y la salinidad

2020

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Baccharis dracunculifolia is a South American dioecious shrub of the Asteraceae family, with a wide geographic distribution and potential use for recovery of degraded areas, ornamental and medicinal purposes. There are two subspecies: B. dracunculifolia subsp. dracunculifolia and B. dracunculifolia subsp. tandilensis. The latter is endemic to the Tandilia hills system in Argentina and recently was recorded its expansion to another environment, the coastal dunes in the Buenos Aires province. The aims of this research were to characterize the germination of B. dracunculifolia subsp. tandilensis according to temperature and light, and to compare the germination in saline conditions of seeds coming from hills (A) and marine coastal dune environment (C). Germination responds positively to light without showing another important type of primary dormancy. Thermal time was 2500°Ch (104°Cd) and base temperature of 6°C, without temperature germination constraints between 20-28°C and thermo-inhibition at 35° C. Response to NaCl concentrations was similar between seeds from environments A and C, both showed strong germination inhibition at 100 mM of NaCl and higher concentrations. These results are discussed in relation to environmental conditions and in comparation whit physiological characteristics reported for subsp. dracunculifolia and other species within the genus Baccharis.

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Section: Resultados Y Discusión Prueba Germinación (Pg)unclassified

Section: Introductionunclassified

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Germinación de Baccharis dracunculifolia subsp. tandilensis: caracterización basada en la temperatura, la luz y la salinidad

2020

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“…Sediment deposition also filtered out small-seeded species on floodplains. Small seeds may have higher light requirements for germination (Jensen and Gutekunst 2003;Galindez et al 2009) or insufficient seed reserves to emerge from depth. We did not, however, check the soil for seedlings that germinated but died before emerging.…”

Section: Discussionmentioning

confidence: 99%

Seed Size, Sediment, and Spatial Heterogeneity: Post-Flood Species Coexistence in Dryland Riparian Ecosystems

et al. 2011

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Floods create landscape heterogeneity through erosion and deposition of sediment, but more information is needed on how these physical processes influence plant communities. We conducted two glasshouse experiments to determine how assemblages of riparian seeds with different traits respond to burial by sediment, and to determine whether species diversity increases in response to heterogeneous sediment deposition. In experiment #1, three sediment treatments were applied to soil collected from the riparian zone of a semi-arid river, and in experiment #2, seeds from 30 plant species were subject to three sediment and two soil moisture treatments. We found that seed mass, wetland affinity, and phylogeny all influence capacity to emerge from depth, with sediment thus acting as an environmental filter. Smallseeded wetland species were abundant in a treatment that simulated flood wetting with no sedimentation, while deposition of sediment (0.2 to 10 cm) favored large-seeded mesic and xeric species, and to a lesser extent monocots (vs. eudicots). Rapid drawdown of water further increased emergence for large, buried seeds, suggesting that deep sedimentation together with rapidly draining water can terrestrialize post-flood communities. Although spatially heterogeneous sediment depth creates patchy community assemblages, it did not increase diversity in comparison to uniform lack of sedimentation.

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The dynamics of three shrub species in a fire-prone temperate savanna: the interplay between the seed bank, seed rain and fire regime

et al. 2012

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Seed mass and germination in Asteraceae species of Argentina

Cited by 20 publications

References 0 publications

Germinación de Baccharis dracunculifolia subsp. tandilensis: caracterización basada en la temperatura, la luz y la salinidad

Germinación de Baccharis dracunculifolia subsp. tandilensis: caracterización basada en la temperatura, la luz y la salinidad

Seed Size, Sediment, and Spatial Heterogeneity: Post-Flood Species Coexistence in Dryland Riparian Ecosystems

The dynamics of three shrub species in a fire-prone temperate savanna: the interplay between the seed bank, seed rain and fire regime

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