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Endogenous jasmonates in dry and imbibed sunflower seeds from plants grown at different soil moisture contents

Published online by Cambridge University Press:  01 June 2007

Ana Vigliocco
Affiliation:
Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales Universidad Nacional de Río Cuarto. 5800-Río Cuarto, Argentina
Sergio Alemano
Affiliation:
Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales Universidad Nacional de Río Cuarto. 5800-Río Cuarto, Argentina
Otto Miersch
Affiliation:
Institut für Pflanzenbiochemie, Weinberg 3, 06120-Halle, Germany
Daniel Alvarez
Affiliation:
Instituto Nacional de Tecnología Agropecuaria, INTA-EEA, Manfredi, Argentina
Guillermina Abdala*
Affiliation:
Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales Universidad Nacional de Río Cuarto. 5800-Río Cuarto, Argentina
*
*Correspondence Fax: +54 358 4676230 Email: gabdala@exa.unrc.edu.ar

Abstract

In this study, we characterized two sunflower (Helianthus annuus L.) lines with differential sensitivity to drought, the sensitive line B59 and the tolerant line B71. Using both lines, we compared the content of endogenous jasmonates (JAs) in dry and imbibed seeds from plants grown under irrigation and drought. Jasmonic acid (JA), 12-oxo-phytodienoic acid (OPDA), 11-hydroxyjasmonate (11-OH-JA) and 12-hydroxyjasmonate (12-OH-JA) were detected in dry and imbibed sunflower seeds. Seeds from plants grown under drought had a lower content of total JAs and exhibited higher germination percentages than seeds from irrigated plants, demonstrating that environmental conditions have a strong influence on the progeny. OPDA and 12-OH-JA were the main compounds found in dry seeds of both lines. Imbibed seeds showed an enhanced amount of total JAs with respect to dry seeds produced by plants grown in both soil moisture conditions. Imbibition triggered a dramatic OPDA increase in the embryo, suggesting a role of this compound in germination. We conclude that JAs patterns vary during sunflower germination and that the environmental conditions experienced by the mother plant modify the hormonal content of the seed progeny.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2007

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