There seems to be a lot of orange russian tomatoes that are high in beta-carotene. I tried some orange heart-shaped russian tomatoes this summer and most of them came with dark-orange-red flesh, rather than golden tangerine orange flesh. I'll take pictures and make a report here soon, some of them might be good candidates for your breeding project.
Strangely, I've grown Zolotoe Serdtse for 3 years and it has always came as a tangerine orange tomato for me, while it has been reported on this forum as a beta carotene orange tomato. Maybe I do not have the original strain.
David
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