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dc.contributor.author
Bazin, J.
dc.contributor.author
Batlla, Diego
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dc.contributor.author
Dussert, S.
dc.contributor.author
El-Maarouf-Bouteau, H.
dc.contributor.author
Bailly, C.
dc.date.available
2020-02-14T20:42:18Z
dc.date.issued
2011-01
dc.identifier.citation
Bazin, J.; Batlla, Diego; Dussert, S.; El-Maarouf-Bouteau, H.; Bailly, C.; Role of relative humidity, temperature, and water status in dormancy alleviation of sunflower seeds during dry after-ripening; Oxford University Press; Journal of Experimental Botany; 62; 2; 1-2011; 627-640
dc.identifier.issn
0022-0957
dc.identifier.uri
http://hdl.handle.net/11336/97681
dc.description.abstract
The effect of various combinations of temperature and relative humidity on dormancy alleviation of sunflower seeds during dry after-ripening was investigated. The rate of dormancy alleviation depended on both temperature and embryo moisture content (MC). Below an embryo MC of 0.1 g H2O g-1 dw, dormancy release was faster at 15 °C than at higher temperatures. This suggests that dormancy release at low MC was associated with negative activation energy, supported by Arrhenius plots, and low Q10 values. At higher MC, the rate of dormancy alleviation increased with temperature, correlating well with the temperature dependence of biochemical processes. These findings suggests the involvement of two distinct cellular mechanisms in dormancy release; non-enzymatic below 0.1 g H2O g-1 dw and associated with active metabolism above this value. The effects of temperature on seed dormancy release above the threshold MC were analysed using a population-based thermal time approach and a model predicting the rate of dormancy alleviation is provided. Sunflower embryo dormancy release was effective at temperatures above 8 °C (the base temperature for after-ripening, TbAR, was 8.17 °C), and the higher the after-ripening temperature above this threshold value, the higher was the rate of dormancy loss. Thermodynamic analyses of water sorption isotherms revealed that dormancy release was associated with less bound water and increased molecular mobility within the embryonic axes but not the cotyledons. It is proposed that the changes in water binding properties result from oxidative processes and can, in turn, allow metabolic activities.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
AFTER-RIPENING
dc.subject
PHYSIOLOGICAL DORMANCY
dc.subject
RELATIVE HUMIDITY
dc.subject
SEED
dc.subject
SUNFLOWER
dc.subject
TEMPERATURE
dc.subject
THERMAL TIME
dc.subject
WATER STATUS
dc.subject.classification
Otras Ciencias Agrícolas
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dc.subject.classification
Otras Ciencias Agrícolas
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dc.subject.classification
CIENCIAS AGRÍCOLAS
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dc.title
Role of relative humidity, temperature, and water status in dormancy alleviation of sunflower seeds during dry after-ripening
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-02-07T13:42:03Z
dc.journal.volume
62
dc.journal.number
2
dc.journal.pagination
627-640
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Oxford
dc.description.fil
Fil: Bazin, J.. Universite de Paris VI; Francia
dc.description.fil
Fil: Batlla, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina
dc.description.fil
Fil: Dussert, S.. No especifica;
dc.description.fil
Fil: El-Maarouf-Bouteau, H.. Universite de Paris VI; Francia
dc.description.fil
Fil: Bailly, C.. Universite de Paris VI; Francia
dc.journal.title
Journal of Experimental Botany
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/jxb/erq314
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/jxb/article/62/2/627/593866
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