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Originally Posted by Fred Hempel
In looking at the plants, it makes sense now that the heterosis is only evident in determinates. Essentially, it by making the plant more vegetative, it makes a determinate plant grow a bit bigger, instead of stopping.
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Yes, there is an interaction of some kind between the two mutations that increases tomato production beyond what you would expect.
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I think this is an area where hybrids are very promising, compared to OP lines -- because you can balance "flower production" mutations like multiflora with a second parent. Multiflora is useful for producing flowers, but it also leads to the early cessation of vegetative growth. So reducing it's effect is sometimes desired.
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Yes, I am on record as not appreciating the multiflora trait in the homozygous condition, but as a parent for F1's with the heterozygous trait I can absolutely see the value.