Fig. 1.

Proportion of seeds germinating in seed lots harvested in the indicated years and stored at 5 °C and 3–50 % RH. Germination was measured in 2018 (diamonds), and samples that were assessed for RNA integrity are indicated by circled points. Data for 2017 germination assessments of watermelon (E) and tomato (F) are also provided (triangles) and these points are connected to 2018 assessments by a vertical line. Some tomato seed lots had seeds lacking normal thin trichomes on seed coats; these are indicated by coloured points. Data for each crop were fitted to the Avrami model (solid curve), which was used to calculate longevity parameters (P50, dashed lines).