Artículo
Molecular mechanisms underlying the entrance in secondary dormancy of Arabidopsis seeds
Ibarra, Silvia Elizabeth
; Tognacca, Rocío Soledad
; Dave, Anuja; Graham, Ian A.; Sanchez, Rodolfo Augusto
; Botto, Javier Francisco
Fecha de publicación:
01/2016
Editorial:
Wiley
Revista:
Plant, Cell and Environment
e-ISSN:
1365-3040
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
As seasons change, dormant seeds cycle through dormant states until the environmental conditions are favourable for seedling establishment. Dormancy cycle is widespread in the plant kingdom allowing the seeds to display primary and secondary dormancy. Several reports in the last decade have focused on understanding the molecular mechanisms of primary dormancy, but our knowledge regarding secondary dormancy is limited. Here, we studied secondary dormancy induced in Arabidopsis thaliana by incubating seeds at 25 °C in darkness for 4 d. By physiological, pharmacological, expression and genetics approaches, we demonstrate that (1) the entrance in secondary dormancy involves changes in the content and sensitivity to GA, but the content and sensitivity to ABA do not change, albeit ABA is required; (2) RGL2 promotes the entrance in secondary dormancy through ABI5 action; and (3) multivariate analysis with 18 geographical and environmental parameters of accession collection place suggests that temperature is an important variable influencing the induction of secondary dormancy in nature.
Palabras clave:
Aba
,
Ga
,
Natural Variation
,
Primary Dormancy
,
Secondary Dormancy
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Articulos(IFEVA)
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Citación
Ibarra, Silvia Elizabeth; Tognacca, Rocío Soledad; Dave, Anuja; Graham, Ian A.; Sanchez, Rodolfo Augusto; et al.; Molecular mechanisms underlying the entrance in secondary dormancy of Arabidopsis seeds; Wiley; Plant, Cell and Environment; 39; 1; 1-2016; 213-221
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