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Composition of tomatoes and tomato products in antioxidants (WG1) page 53
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concentrations were large enough to have potential consequences for insect herbivores
feeding on tomato plants.
Nitrogen availability was also found by Stout et al.(1998) to have a strong effect on
constitutive levels of phenolics in tomato seedlings grown in sand in a greenhouse. Leaflets
from a given position on 3- to 5-leaf stage plants in the low-N treatment ([N]≤2 mM) had
levels of phenolics more than twice those found in corresponding leaflets from high-N plants
([N]≤8 mM), with plants in the intermediate-N treatment ([N]≤4 mM) having intermediate
levels.
Effect of Phosphorus
In tomato plants, cv. Marglobe, cultivated by Peñalosa et al.(1989) in sand pots in
glasshouse, deficient P levels (0.2 and 0.5 mmol P/l) in the nutrient solution resulted in a
flavonol glycosides decrease in leaves in comparison with adequate P supply (2.0 mmol P/l).
High P level (4.0 mmol P/l) in nutrient solution also led to a decrease in flavonol glycosides
content of leaves at flowering.
6.4.3.3. Fruit development and ripening stage
Hunt and Baker (1980) have identified chalconaringenin, naringenin, naringenin-7glucoside,
and m- and p-coumaric acids as phenolic constituents of tomato fruit cuticles of
three cultivars (Aisa Craig, Alicante and Grower’s Pride). The phenolic content of the cuticles
increased substantially during fruit development, those from immature green and mature ripe
fruit of cv. Ailsa Craig yielding respectively 2.8 and 61 µg/cm² (1.4 and 6% of the total
membrane wt). Phenolics were minor constituents (