Table II.

Effect of IAA on shoot growth of wild-types, never ripe, and flacca tomato plants

Tomato PlantsPlant HeightShoot Fresh Wt
cm g shoot−1
Wild type (Ailsa Craig)
 Control15.5 ± 0.2 (100)a6.69 ± 0.22 (100)a
 IAA, 10 μm 13.0 ± 0.1 (84)b3.02 ± 0.12 (45)b
 IAA, 50 μm 11.2 ± 0.1 (72)c1.94 ± 0.10 (29)c
Never ripe mutant
 Control13.0 ± 0.3 (100)a5.14 ± 0.24 (100)a
 IAA, 10 μm 12.7 ± 0.4 (97)a4.56 ± 0.24 (89)a
 IAA, 50 μm 10.7 ± 0.3 (82)b2.64 ± 0.19 (51)b
Wild type  (Rheinlands Ruhm)
 Control20.6 ± 0.4 (100)a5.19 ± 0.11 (100)a
 IAA, 50 μm 17.7 ± 0.3 (86)b3.93 ± 0.08 (76)b
 IAA, 100 μm 15.2 ± 0.7 (74)c2.81 ± 0.20 (54)c
Flacca mutant
 Control18.2 ± 0.1 (100)a2.89 ± 0.07 (100)a
 IAA, 50 μm 17.1 ± 0.4 (94)a2.67 ± 0.06 (93)a
 IAA, 100 μm 14.5 ± 0.4 (80)b2.20 ± 0.16 (76)b

Plants at the third leaf stage were root-treated with compounds in hydroponics. After 6 d of IAA treatments, shoot fresh wt. and plant height were measured as growth parameters. Data are means of 15 plants (five hydroponic vessels), compiled from an experimental series. Means with a common letter are not significantly different (P = 0.01; Duncan's multiple range test). In parenthesis, values in percent of control.