Kerr, E. A.
Following reports of the gf, green flesh (Kerr, TGC6:17), and Nr, never ripe (Rick, TGC6:22) mutants, three other somewhat similar mutants, which arose independently, were sent to Vineland for test. These were No. 274 from Thompson of the University of Illinois (TGC7:15), No. 54-1293-4 from Paddock of Ohio State University and the variety Evergreen from Glecklers Seedsmen, Metamora, Ohio. Various crosses were grown in 1957. The table gives the resulting phenotypes.
Cross Ripe Fruit Type
Evergreen X green, no red - gf, r
Evergreen x gf r green, no red - gf, r
Evergreen x r green disappears, - gf^+, r
no red
Evergreen x gf green + red - gf, r^+
Evergreen x No. 274 green + red - gf, r^+
Evergreen x No. 54-1293-4 green disappears, - gf^+, r^+, gr^+
red
gf X green + red - gf
gf x No. 274 green + red - gf
gf x normal green disappears, - gf^+
red
gf x No. 54-1293-4 green disappears, - gf^+, gr^+
red
gf x Nr green partly - Nr
disappears
No. 274 X green + red - gf
No. 274 x normal green disappears, - gf^+
red
No. 274 x No. 54-1293-4 green disappears, - gf^+, gr^+
red
No. 274 x Nr green partly - Nr
disappears
No. 54-1293-4 X outer wall green, - gr
center red
No. 54-1293-4 x normal green disappears, - gr^+
red
These data indicate (1) that Nr is the only dominant mutant in this group, (2)
that No. 274 and Evergreen both have the gene gf and (3) that chlorophyll
retention in No. 54-1293-4 is recessive.An F2 population of the cross gf a c d r y x No. 54-1293-4 was grown in pots in the greenhouse. Inconclusive results on the inheritance of chlorophyll retention in No. 54-1293-4 were obtained. The tests will be continued inder field conditions where a succession of maturities on each plant can be compared.
Paddock (personal communication) reports that his green-fruited mutant first appeared in 1952 in a chimeral fruit having green and red sectors. He and Alexander propose the name "green ripe" for the mutant with gr as the gene symbol.