| molecular characterization of heterochromatic regions around the tm-2 locus in chromosome 9 of tomato. | the gene tm-2 (tomato mosaic virus (tomv) resistant), which is tightly linked to a morphological marker gene nv (netted virescent), resides in a heterochromatic region near the centromere of chromosome 9 in tomato. tm-2 and tm-2a are known to be allelic, and exhibit similar phenotypes to each other, but can be differentiated by their response to different tomv strains. an inoculation experiment demonstrated that tm-2 helped a mutant strain of tomv to infect a heterozygous tomato (tm-2/tm-2a). ai ... | 1996 | 9039437 |