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Potato (Solanum tuberosum) tubers exhibit an increase in translational activity in response to mechanical wounding. The response is biphasic, with an initial stimulation apparent within the first 2 h after wounding and a second increase occurring 12 to 24 h after wounding. Increased activity is apparent by measurement of protein synthesis both in vivo and in vitro using a cell-free extract. Accumulation of the translational elongation factor 1 subunit [alpha] (EF-1[alpha]) parallels translational activity. Changes in the steady-state level of EF-1[alpha] mRNA, and expression of a chimeric EF-1[alpha] promoter/[beta]-glucuronidase construct in transgenic potato tubers, indicate that the gene encoding EF-1[alpha] is transcribed during both periods of translational stimulation. These results indicate that stimulation of translational activity is coordinated with increased expression and accumulation of translation factors.

plant physiology

Biphasic Stimulation of Translational Activity Correlates with Induction of Translation Elongation Factor 1 Subunit [alpha] upon Wounding in Potato Tubers