Geographic variation in the flood - induced fluctuating temperature requirement for germination in Setaria parviflora seeds

Our aim was to search for specific seed germinative strategies related to flooding escape in Setaria parviflora, a common species across the Americas. For this purpose, we investigated induction after floods, in relation to fluctuating temperature requirements for germination in seeds from mountain,...

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Detalles Bibliográficos
Autor principal: Mollard, Federico Pedro Otto
Otros Autores: Insausti, Pedro
Formato: Artículo
Lenguaje:Inglés
Materias:
ECOTYPES
FLOODPLAIN
GRASSLAND
PAMPA
SEED DORMANCY
SEED GERMINATION
VEGETATION GAPS
WATER
ECOTYPE
FLOOD
GEOGRAPHICAL VARIATION
GRASS
IMBIBITION
MESOCOSM
SEED
TEMPERATURE INVERSION
ADAPTATION
ECOSYSTEM
FLOODING
PHYSIOLOGICAL STRESS
PHYSIOLOGY
PLANT SEED
SEDIMENT
ADAPTATION, PHYSIOLOGICAL
FLOODS
GEOLOGIC SEDIMENTS
GERMINATION
LIGHT
POACEAE
SEEDS
STRESS, PHYSIOLOGICAL
TEMPERATURE
SETARIA [PLANT]
SETARIA PARVIFLORA
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Mollard.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a Our aim was to search for specific seed germinative strategies related to flooding escape in Setaria parviflora, a common species across the Americas. For this purpose, we investigated induction after floods, in relation to fluctuating temperature requirements for germination in seeds from mountain, floodplain and successional grasslands. A laboratory experiment was conducted in which seeds were imbibed or immersed in water at 5°C. Seeds were also buried in flood-prone and upland grasslands and exhumed during the flooding season. Additionally, seeds were buried in flooded or drained grassland mesocosms. Germination of exhumed seeds was assayed at 25°C or at 20°C/30°C in the dark or in the presence of red light pulses. After submergence or soil flooding, a high fraction [less than 32 percent] of seeds from the floodplain required fluctuating temperatures to germinate. In contrast, seeds from the mountains showed maximum differences in germination between fluctuating and constant temperature treatment only after imbibition [35 percent] or in non-flooded soil conditions [40 percent]. The fluctuating temperature requirement was not clearly related to the foregoing conditions in the successional grassland seeds. Maximum germination could also be attained with red light pulses to seeds from mountain and successional grasslands. Results show that the fluctuating temperature requirement might help floodplain seeds to germinate after floods, indicating a unique feature of the dormancy of S. parviflora seeds from floodplains, which suggests an adaptive advantage aimed at postponing emergence during inundation periods. In contrast, the fluctuating temperature required for germination among seeds from mountain and successional grasslands show its importance for gap detection. 
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653 0 |a VEGETATION GAPS 
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773 |t Plant Biology  |g Vol.13, no.4 (2011), p.660-666 
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900 |a SEED GERMINATION 
900 |a VEGETATION GAPS 
900 |a WATER 
900 |a ECOTYPE 
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900 |a ADAPTATION 
900 |a ECOSYSTEM 
900 |a FLOODING 
900 |a PHYSIOLOGICAL STRESS 
900 |a PHYSIOLOGY 
900 |a PLANT SEED 
900 |a SEDIMENT 
900 |a ADAPTATION, PHYSIOLOGICAL 
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900 |a LIGHT 
900 |a POACEAE 
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900 |a STRESS, PHYSIOLOGICAL 
900 |a TEMPERATURE 
900 |a SETARIA [PLANT] 
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900 |a Our aim was to search for specific seed germinative strategies related to flooding escape in Setaria parviflora, a common species across the Americas. For this purpose, we investigated induction after floods, in relation to fluctuating temperature requirements for germination in seeds from mountain, floodplain and successional grasslands. A laboratory experiment was conducted in which seeds were imbibed or immersed in water at 5°C. Seeds were also buried in flood-prone and upland grasslands and exhumed during the flooding season. Additionally, seeds were buried in flooded or drained grassland mesocosms. Germination of exhumed seeds was assayed at 25°C or at 20°C/30°C in the dark or in the presence of red light pulses. After submergence or soil flooding, a high fraction [less than 32 percent] of seeds from the floodplain required fluctuating temperatures to germinate. In contrast, seeds from the mountains showed maximum differences in germination between fluctuating and constant temperature treatment only after imbibition [35 percent] or in non-flooded soil conditions [40 percent]. The fluctuating temperature requirement was not clearly related to the foregoing conditions in the successional grassland seeds. Maximum germination could also be attained with red light pulses to seeds from mountain and successional grasslands. Results show that the fluctuating temperature requirement might help floodplain seeds to germinate after floods, indicating a unique feature of the dormancy of S. parviflora seeds from floodplains, which suggests an adaptive advantage aimed at postponing emergence during inundation periods. In contrast, the fluctuating temperature required for germination among seeds from mountain and successional grasslands show its importance for gap detection. 
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