Morphology of mutant plants. nbs1 and tert homozygotes were crossed and from segregating F2 seedlings double homozygotes tert/nbs1 were selected along with wild type plants (wt), TERT/nbs1, and tert/NBS1 mutants. (A) G6 wild type plant, (B) double homozygous tert/nbs1 mutants from G3, G4, and G5, line K12. (C) G6 homozygote tert/nbs1, Line L2. Inset - dwarf phenotypes of double mutant mutants, generation G6, Line K12. Note that the lower plant produced siliques with infertile seeds on a very short stem (arrow). (D) tert plant, line 69–2, G6. (E) nbs1 plant, G6. All images represent 3 to 4 week old plants.