From the article:

>Because of the self-incompatible nature of the F1 hybrid cultivar, we had to maintain Tg lines by vegetative propagation. However, the bright fuorescence of Tg fowers was kept for at least 18 months, i.e., from the beginning of shoot formation until the preparation of this manuscript.

Looks like its a no on passing to the next generation, but the plants stay alive for a long time.