Ornamental plants growing in urban areas are exposed to soil salinity that negatively
affects their quality. Identifying species that retain high ornamental value despite
salt stress is therefore of high practical importance. Curly kale (Brassica oleracea
L. var. sabellica L.) is an attractive plant with leaves of both edible and ornamental
character. The aim of the study was to evaluate a response of ornamental curly kale
to different concentrations of NaCl. The study material was ‘Scarlet’ cultivar. The
plants were grown in pots in a plastic tunnel. They were irrigated with NaCl solution
at the following concentrations: 50, 100, 200, 400, and 800 mM mmol·dm-3. NaCl
treatment resulted in a significant increase in pH and electrical conductivity (EC)
of the substrate. Salt stress significantly affected plant growth and number, width
and length of leaves, and the effects depended on NaCl concentration. Fifteen days
after the salt supply ceased, relative chlorophyll content in leaves (SPAD) decreased
due to NaCl treatment in a concentration-dependent manner. Treatments with 200,
400, and 800 mmol·dm-3 NaCl reduced stomatal conductance, and the changes were
greater on the 5th day following the stress cessation than on the 15th day. Irrigation
with a 200, 400, and 800 mmol·dm-3 NaCl solution negatively affected plant bonitation score. The plants treated with 50 i 100 mmol·dm-3 NaCl were not significantly
different visual score from the control plants.
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