Seed production and germination of late generation double mutants. (A) Comparison of siliques from wt (G6) and G2 to G6 double homozygotes tert/nbs1, Line K12. Seeds from G5 plants were 45 % sterile in both lines, K12 and L2. G6 seeds were completely sterile. (B) nbs1 siliques (G6) compared to tert, line 69–2 (G2 to G6). The fertility of nbs1 and tert seeds was almost 100 %, irrespective of seed generation. (C-D) Seedlings of G7 plants on agar MS cultures, line K12. (C) Heterozygote TERT/nbs1. (D) tert/nbs1 genotype seedlings did not germinate.