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Earth-Kind is a special designation given to select rose cultivars with superior stress tolerance (heat, drought, and pest tolerance) and outstanding landscape perfor- mance. The responses of Earth-Kind roses to high salinity stress are unknown. A greenhouse study was conducted to evaluate 18 Earth-Kind rose cultivars (Belinda's Dream, Cecile Brunner, Climbing Pinkie, Ducher, Duchesse de Brabant, Else Poulsen, Georgetown Tea, La Marne, Madame Antoine Mari, Marie Daly, Monsieur Tillier, Mrs. Dudley Cross, Mutabilis, Perle d'Or, Reve d'Or, Sea Foam, Souvenir de St. Anne's, and Spice) in College Station and 10 of the same 18 cultivars in El Paso in response to two salinity levels at electrical conductivity (EC) of 1.2 (control, nutrient solution) and 10.0 dS·m L1 (EC 10). In both locations, 'Belinda's Dream' and 'Climbing Pinkie' in EC 10 had no or little reduction in shoot growth, flower number, and leaf SPAD readings. The net photosynthetic rate (Pn), stomatal conductance (gS), and transpiration (E) did not decrease in these two cultivars at EC 10 in El Paso. In College Station, 'Mrs. Dudley Cross', 'Reve d'Or', and 'Sea Foam' in EC 10 also had no or little reduction in shoot growth, flower number, and leaf SPAD readings. In both locations, 'Cecile Brunner' and 'Else Poulsen' in EC 10 had severe visual foliar salt damage, and they had the greatest reductions in shoot growth and flower number. In addition to these two cultivars, the lowest relative shoot dry weight (DW) and flower number was observed in 'Madame Antoine Mari', 'Perle d'Or', 'Spice', and 'Souvenir de St. Anne's' in College Station. In summary, 'Belinda's Dream', 'Climbing Pinkie', ' Mrs. Dudley Cross', 'Reve d'Or', and 'Sea Foam' were the most salt-tolerant cultivars, whereas 'Cecile Brunner', 'Else Poulsen', 'Madame Antoine Mari', 'Perle d'Or', 'Spice', and 'Souvenir de St. Anne's' were the least salt-tolerant among the cultivars investigated.

Response of 18 Earth-Kind® Rose Cultivars to Salt Stress