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ENVIRONMENTAL STRESS AND ADAPTATION TO STRESS

Improved Resistance to Controlled Deterioration in Transgenic Seeds^1,[W],[OA]

Instituto de Recursos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, 41080 Seville, Spain

We show that seed-specific overexpression of the sunflower (Helianthus annuus) HaHSFA9 heat stress transcription factor (HSF) in tobacco (Nicotiana tabacum) enhances the accumulation of heat shock proteins (HSPs). Among these proteins were HSP101 and a subset of the small HSPs, including proteins that accumulate only during embryogenesis in the absence of thermal stress. Levels of late embryogenesis abundant proteins or seed oligosaccharides, however, were not affected. In the transgenic seeds, a high basal thermotolerance persisted during the early hours of imbibition. Transgenic seeds also showed significantly improved resistance to controlled deterioration in a stable and transgene-dependent manner. Furthermore, overexpression of HaHSFA9 did not have detrimental effects on plant growth or development, including seed morphology and total seed yield. Our results agree with previous work tentatively associating HSP gene expression with phenotypes important for seed longevity. These findings might have implications for improving seed longevity in economically important crops.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Juan Jordano (fraga{at}cica.es).

^[W] The online version of this article contains Web-only data.

^[OA] The online version of this article contains Web-only data.

www.plantphysiol.org/cgi/doi/10.1104/pp.106.087817

^* Corresponding author; e-mail fraga{at}cica.es; fax 34–954–624002.

Received August 3, 2006; accepted September 14, 2006; published September 22, 2006.

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