Artículo
Spatiotemporal variations in salicylic acid and hydrogen peroxide in sunflower seeds during transition from dormancy to germination
Vigliocco, Ana Edit
; del Bel, Zoé
; Perez Chaca, Maria Veronica; Molina, Alicia; Zirulnik, Fanny; Andrade, Andrea Mariela
; Alemano, Sergio Gabriel
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Fecha de publicación:
05/2020
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Physiologia Plantarum
ISSN:
0031-9317
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Phytohormones and reactive oxygen species mediate processes such as germination and dormancy. The elucidation of the physiological and biochemical events implicated in the transition from dormancy to germination in different plant species such as sunflower becomes a topic of interest. In this study, we investigated the spatiotemporal variation of salicylic acid (SA), hydrogen peroxide (H2O2) and the activity of two antioxidant enzymes (catalase, CAT – EC 1.11.1.6 and ascorbate peroxidase – EC 1.11.1.11) in embryonic axis and cotyledons of dry and imbibed seeds of dormant (B123) and non-dormant (B91) sunflower lines. The results showed that embryonic axis had higher level of SA and H2O2 than cotyledons in both lines. In dry seeds, B123 embryo (embryonic axis + cotyledons) showed a higher SA content than B91. After dry storage at room temperature, SA decreased in B123 embryos to a value close to that registered in B91 embryos. B123 embryonic axis of dry seeds presented higher H2O2 levels than B91. Dry storage led to an increase of H2O2 levels and a decrease of CAT activity in B123 embryonic axis. During imbibition, B123 seeds stored for 33 days displayed an increase in SA level in the embryonic axis (3 h of imbibition) and this lower level correlated with a decrease in H2O2 (6 h of imbibition). Thus, the embryo-imposed dormancy in B123 dry seeds was associated with high levels of SA and low H2O2, whereas the dormancy release was linked with SA decrease and increase of H2O2 as a consequence of lower CAT activity.
Palabras clave:
SALICYLIC ACID
,
HYDROGEN PEROXIDE
,
SUNFLOWER
,
DORMANCY
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Identificadores
Colecciones
Articulos (INIAB)
Articulos de INSTITUTO DE INVESTIGACIONES AGROBIOTECNOLOGICAS
Articulos de INSTITUTO DE INVESTIGACIONES AGROBIOTECNOLOGICAS
Citación
Vigliocco, Ana Edit; del Bel, Zoé; Perez Chaca, Maria Veronica; Molina, Alicia; Zirulnik, Fanny; et al.; Spatiotemporal variations in salicylic acid and hydrogen peroxide in sunflower seeds during transition from dormancy to germination; Wiley Blackwell Publishing, Inc; Physiologia Plantarum; 169; 1; 5-2020; 27-39
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