Polyphenols profile in globe artichoke as affected by intraspecific competition
The polyphenols, a large group of secondary metabolites widely distributed in plants, have received considerable attention, as they act as powerful scavengers of harmful radicals and thus can be protective against chronic diseases such as cancer and cardiovascular malfunction. Currently, the perceived safety problems with synthetic antioxidants led to an increased interest for the recovery and exploitation of natural antioxidants. In globe artichoke (Cynara cardunculus var. scolymus) the leaves, floral stems and outer bracts, could be a good source of natural antioxidants. The content of phenolic substances is influenced by a large number of biotic and abiotic factors such as genotype, climatic condition, agro-technical processes, stage of ripeness, postharvest manipulation, etc. With this study, the influence of intraspecific competition on polyphenols profile in the receptacle and leaves was analysed. The field-experiment was conducted in Sicily (Italy) on two genotypes: Violet of Provence and Harmony. The different level of intraspecific competition was determined by planting densities (1.0, 1.2, 1.4, and 1.8 plants m‑2) and two arrangements (single or twin rows). The polyphenols profile was determined by HPLC analysis. Effects of plant competition were shown by a significant increase of phenolic compounds in receptacle, ranging from 2.76 to 4.21 g kg‑1 of dry matter (from 1.0 to 1.4 plants m‑2, respectively). In contrast, in leaves the content of these compounds decreased when passing from the lower to the higher plant density. This trend, similar for each plant part, was more marked for the genotype Harmony. However, regardless of plant arrangement and plant density, Harmony plant parts displayed a higher content of total measured polyphenols than Violet of Provence (5.24 and 4.73 g kg‑1 of dry matter), for both leaves and receptacle.
Pandino, G., Lombardo, S., Bonomo, A. and Mauromicale, G. (2020). Polyphenols profile in globe artichoke as affected by intraspecific competition. Acta Hortic. 1284, 227-234
Cynara cardunculus, plant density, plant arrangement, flavonoids, caffeoylquinic acids