What determines the volume of seed cells?

[Anthony_Toronto]

Some years my tomatoes are very solid with small seed cells, other years the volume of seed cells is significant in comparison to the volume of flesh. One variety (that I believe to be Arkansas Traveller, or a hybrid thereof) has tomatoes that are almost solid flesh some years, and almost all gel in other years (or at different times throughout the season). Just wondering if anyone knew the reason, or a reason.