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Bañón S., Miralles J., Ochoa J., Sánchez-Blanco M.J., 2012. Th e eff ect of salinity and high boron on growth, photosynthetic activity and mineral contents of two ornamental shrubs. Hort. Sci. (Prague) 39: 188-194.Simultaneous salinity and boron (B) excess often occur due to irrigation with water containing high levels of salts, including B. Th e eff ects of excess of NaCl and B in the nutrient solution on some agronomical and physiological parameters of Viburnum tinus (laurustinus) and Metrosideros excelsa (metrosideros) were studied. Potted plants were grown in a factorial combination of B (1 and 6 mg/l) and NaCl (2 and 6 dS/m). B toxicity (6 mg/l) caused tip/edge burn in the lower leaves of laurustinus, while these symptoms were absent in metrosideros. Toxicity by B reduced dry biomass in the two species, particularly the aerial part in metrosideros and the roots in laurustinus. Metrosideros accumulated a similar content of B in all leaves, while the laurustinus tended to accumulate more B in the lower leaves. Th e leaf B content in laurustinus was reduced by salinity to a greater extent than in metrosideros; however, this was not suffi cient to prevent injuries to the laurustinus photosynthetic system.

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