Figure 2.

Priming decrease longevity in S. lycopersicum seeds while it is enhanced by heat shock treatment. Germination during storage (A) longevity (B) and seed vigor—t50—at 45 days in S. lycopersicum seeds control non-primed, primed and primed+heat shock treatment (38 °C/32 % RH). Germination during storage was fitted with Boltzmann sigmoid $[y=\mathrm{t}\mathrm{o}\mathrm{p}+(\mathrm{b}\mathrm{o}\mathrm{t}\mathrm{t}\mathrm{o}\mathrm{m}\text{-}\mathrm{t}\mathrm{o}\mathrm{p})/1+[v50-(x/\mathrm{s}\mathrm{l}\mathrm{o}\mathrm{p}\mathrm{e})]].$*Significance difference (P ≤ 0.05) by t-test between primed and primed+heat shock samples (n = 4). Error bars show standard deviation.