Abstract
Abstract Ornamental plants are used to improve the aestheticquality of urban and rural landscapes, recreational areas, interiorscapes and commercial sites. Any negative effects of salts on ornamental plant growth have to be taken into consideration mainly for their negative influences on aesthetic value of ornamental plants. The research was conducted to determine the effects of different concentrations of calcium nitrate on some stress parameters (i.e. leaf relative water content, chlorophyll, stomatal conductance, ion leakage in the leaf tissues) and some plant growth parameters (total leaf number, number of dried leaf, main stem diameter, plant crown diameter, plant height, fresh and dry weight of root) of ornamental kale (Brassica oleracea L. var. acephala) plant grown under saline conditions. Four doses of NaCl (NaCl1:30, NaCl2:60, NaCl3:90, NaCl4:120 mM), three doses of Ca(NO3)2 (CaN1:5, CaN2:10, CaN3:15 mM), groups combined together in all doses of NaCl and Ca (NO3)2 and control (NaCl0:0 + CaN0:0) were applied into the pots with three replications. Ca (NO3)2 was applied to the leaf surface of the plants in the pots to be applied as Ca (NO3)2 spray. When the plants reached a certain maturity (two weeks after transfer to the pot), salt stress applications were started. Ca (NO3)2 treatments have applied after one week from salt stress applications. Calcium nitrate treatements applied under salt stress conditions had positive effects and increasing in effect on all parameters examined except for chlorophyll and ion leakage in leaf tissues of the plant. With increasing in calcium nitrate concentration, morphological and physiological characteristics of plants were observed increases in general. It was concluded that the increase of the number of leaves by NaCl2+CaN3 application can be minimized with CaN3 (with 15 mM Ca (NO3)2) stress caused by 60 mM salt concentration According to the results of the research, calcium nitrate applications can be recommended for ornamental kale plants grown under salt stress conditions especially limiting the negative effects of stress and to minimize such damage.
Highlights
Materials and MethodsSalinity stress is an environmental stress factor in terms of culture plants and belongs to the chemical stress group
When all the results obtained from the study are evaluated together, it is seen that Ornamental kale
It was determined that salt stress was decreased in the values of some plant growth and physiological parameters such as total leaf number, main stem diameter, plant crown diameter, plant height, fresh and dry weight of root, chlorophyll and stomal conductivity
Summary
Materials and MethodsSalinity stress is an environmental stress factor in terms of culture plants and belongs to the chemical stress group. Growth medium is problem if containing salt causing many negative effect on plant. These negative effects can be listed as enzyme activation disorder, nutrient imbalance, membrane dysfunction, disruptions in the general metabolic process, osmotic incompatibility and imbalance in water intake, oxidative stress and general development insufficiency (Acosta-Motos et al, 2017; Yadav et al, 2019). Salt tolerance is generally assessed based on the growth or decrease in yield of certain plant parts such as seeds, roots, fruits or leaves (Xu and Mou, 2016; Yadav et al, 2019). Aesthetic value is more important than that of growth rate for landscape plants (Cetin et al, 2018). The visual quality is an important parameter to evaluate the salt tolerance of landscape plants
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