Hydrogen peroxide promotes seed germination, but the molecular mechanisms underlying this process are unclear. This study presents the results of eggplant (Solanum melongena) germination analyses conducted at two different temperatures and follows the effect of hydrogen peroxide treatment on seed germination and the seed proteome. Hydrogen peroxide was found to promote eggplant germination in a way not dissimilar to that of increased temperature stimuli. LC-MS profiling detected 729 protein families, 77 of which responded to a temperature increase or hydrogen peroxide treatment. These differentially abundant proteins were found to be involved in a number of processes, including protein and amino acid metabolism, carbohydrate metabolism, and the glyoxylate cycle. There was a very low overlap between hydrogen peroxide and temperature-responsive proteins, highlighting the differences behind the seemingly similar outcomes. Furthermore, the observed changes from the seed proteome indicate that hydrogen peroxide treatment diminished the seed endogenous hydrogen peroxide pool and that a part of manifested positive hydrogen peroxide effect might be related to altered sensitivity to abscisic acid.

CEITEC Central European Institute of Technology Faculty of AgriSciences Mendel University in Brno 613 00 Brno Czech Republic

Department of Molecular Biology and Radiobiology Faculty of AgriSciences Mendel University in Brno Zemedelska 1 CZ 61300 Brno Czech Republic

Institute of Biophysics AS CR 613 00 Brno Czech Republic

Rouse Life Sciences Department of Biological Sciences Auburn University Auburn AL 36849 USA

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