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Journal of Experimental Botany, Vol. 53, No. 373, pp. 1445-1452, June 2002
© 2002 Oxford University Press

Original Papers

Developmentally and stress-induced small heat shock proteins in cork oak somatic embryos

Pere Puigderrajols1, Anna Jofré1, Gisela Mir, Maria Pla, Dolors Verdaguer, Gemma Huguet and Marisa Molinas2

Laboratori del Suro, Facultat de Ciències, Universitat de Girona, 17071 Girona, Spain

The timing and tissue localization of small heat shock proteins (sHSPs) during cork oak somatic embryo development was investigated under normal growing culture conditions and in response to stress. Western blot analyses using polyclonal antibodies raised against cork oak recombinant HSP17 showed a transient accumulation of class I sHSPs during somatic embryo maturation and germination. Moreover, the amount of protein increased at all stages of embryo development in response to exogenous stress. The developmentally accumulated proteins localized to early differentiating, but not the highly dividing, regions of the root and shoot apical meristems. By contrast, these highly dividing regions were strongly immunostained after heat stress. Findings support the hypothesis of a distinct control for developmentally and stress-induced accumulation of class I sHSPs. The possible role of sHSPs is discussed in relation to their tissue specific localization.

Key words: Embryo development, HSP17, small heat shock proteins, somatic embryogenesis, tissue specificity.


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