THE INFLUENCE OF GROWING SEASON ON PROTEIN AND MINERAL CONTENT OF SEVERAL BRASSICA CROPS

Tissues from two Portuguese cabbages, Troncha de Mirandela and Penca de Chaves, and two primitive leaf cultivars, Galega kale and a shoot type Couve-nabiça, were analysed for protein, Ca, Mg, P, K, Fe, S, Mn and Zn, in comparison with a hybrid white cabbage Predena, following growth in Spring/Summer and Summer/Winter seasons in Vila Real, north of Portugal.
The headed cultivars were analysed separated for outer leaves and heads.

The average protein concentrations in the heads were 390.0, 379.2 and 328.2 g kg^-1 DW, respectively for Penca, Troncha and Predena, which were higher than in the leaves.
The leaves of Couve-nabiça and Galega showed higher concentrations, respectively 554.7 and 533.2 and g kg^-1 DW, than the leaves of Penca, Troncha and Predena.
Summer/Winter seasons induced higher protein concentrations than Spring/Summer.

Calcium, Mg, K, S, Fe and Mn concentrations were higher in the leaves than in the heads, while the oposite trend was noted for P and Zn.
The mineral concentrations tended to be higher in Summer/Winter than in Spring/Summer.
Penca and Predena showed the highest Ca and Mg concentrations in leaves and heads, while the highest S, Mn, and Zn contents in leaves were in Galega, and the highest K, P, and Fe was in leaves of Couve-nabiça.
The heads of the two Portuguese cabbages, Troncha and Penca, revealed the highest K, P, S, Fe, Mn, and Zn concentrations.

ISHS Brassica Symposium – IX Crucifer Genetics Workshop

E. Rosa, D. Almeida

https://doi.org/10.17660/ActaHortic.1996.407.32