NO - Besoin d'assistance

Composition of tomatoes and tomato products in antioxidants (WG1) page 38
__________________________________________________________________________________________
Keithly et al.(1990) applied DCPTA to tomato (cv. Pixie) as a pre-germination seed
treatment, at 5 rates ranging 0-3-15-30-150 µM (0-1-5-10-50 mg/kg) for 6h at 24°C with
Tween 80 (0.1%, w/v). The seedling were then cultivated in soil pots in greenhouse at
24/18°C day/night temperature. Ripe fruit weight per plant was doubled from 0 to 10 mg/kg
DCPTA, while the total soluble solids increased from 3.75 to 4.68 % fresh matter. Lycopene
and β-carotene contents increased like 58.5-81-98-112-118 mg/kg and 2.2-3.2-4.3-5.2-5.7
mg/kg fresh matter respectively when DCPTA increased from 0 to 50 mg/kg. So 10 mg/kg
was most efficient.
Hsu and Yokohama (1991) cultivated tomatoes (cv. UCD-82) in soil pots under
greenhouse. Plants were treated either by seed imbibition or by foliar application at the threeleaf
stage with 0, 5, 10, 20 and 50 mg/kg of DCPTA solutions plus 0.01% Tween 80 only
once. DCPTA at 10 mg/kg almost doubled fruit yield and gave a 28% increase in lycopene
(from 1454 to 1857 mg/kg dry matter).
CPTA induced an increase in lycopene synthesis of in vitro cultured VFNT Cherry
tomato fruit which already naturally contained about 10-fold more lycopene than field-grown
tomatoes (Ishida et al, 1998, Table 19).
Table 19. Effect of CPTA on lycopene levels in Cherry tomatoes (after Ishida et al, 1998)
Lycopene
(mg/kg f. m.)
Fruit at 26°C greenhouse
-CPTA +CPTA green fruit red fruit
340
640
In field grown tomatoes cultivated by Graham and Ballestero (1980), Gibberellic acid
1.1
and above all Cycocel increased fruit β-carotene content.
Field tomato plants were sprayed twice (25 and 40 days after transplanting) with
chlormequat (CCC) or alar separately at 250, 500 or 1000 mg/kg by Gabr et al.(1985).
Chlorophylls a and b and carotenoids content (dry matter basis) of tomato plants were
200