Apical meristem arrest is associated with 2 things in tomato. One is old seed. I have several hundred of these this year as I planted a bunch or 8 to 10 year old seed. The other factor is genetics with inter-species crosses the culprit. I've got quite a bit of seed that are from inter-species crosses. This often shows up in those varieties. One example is Burgundy Traveler which will often produce seedlings with no growing point even with fresh seed.
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