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Benjamin D. Taylor and Benjamin K. Hoover

Indole-3-butyric acid (IBA) is frequently used to promote adventitious root development in plant propagation from cuttings. We evaluated the effects of 0, 1000, or 3000 ppm IBA applied as a liquid foliar spray or talc-based basal dip on adventitious rooting of wall germander (Teucrium chamaedrys) cuttings. An initial experiment was conducted in Fall 2016, followed by a replication in Spring 2017. Two-dimensional root area, primary root count, root dry weight, and a rooting index (0 to 5 scale) were assessed as measures of root growth. By all metrics and for both experiments, cuttings benefited from IBA application and exhibited equal or greater root growth after the foliar spray treatment compared with the talc dip. In both experiments and for all metrics, the talc dip method achieved no greater root growth at 3000 ppm IBA than the foliar spray method at 1000 ppm IBA. These results suggest that for wall germander, IBA application by the foliar spray method is equal or superior to the talc dip method presently in widespread use in the horticulture industry.

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Youping Sun, Genhua Niu, and Christina Perez

moderately tolerant to salinity. Niu and Rodriguez (2006a) found that Delosperma cooperi and Gazania rigen had a relatively high tolerance to salinity; Teucrium chamaedrys and Ceratostigma plumbaginoides were moderately tolerant; and Penstemon

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Genhua Niu and Raul I. Cabrera

tissues being lower in those cultivars that were deemed more salt-tolerant on the basis of lesser foliar salt damage ( Cabrera, 2009 ). Fig. 1. Shoot and root ion concentrations of Gazania rigens , Delosperma cooperi , Teucrium chamaedrys , and

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María José Gómez-Bellot, Pedro Antonio Nortes, María Fernanda Ortuño, María Jesús Sánchez-Blanco, Karoline Santos Gonçalves, and Sebastián Bañón

ornamental plants such as Lantana camara , Delosperma cooperi , and Teucrium chamaedrys ( Bañón et al., 2011 ; Niu and Rodríguez, 2006 ). Thus, the excess salinity of reclaimed water may affect each part of the plant differently ( Álvarez et al., 2012

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Iryna Andrenko, Thayne Montague, Cynthia McKenney, and Russell Plowman

increases ( Acosta-Motos et al., 2015 ). For G. villosa plants, the root-to-shoot ratio increased as salinity levels increased ( Fig. 7D ). Niu and Rodriguez (2006b) also reported an increase in the root-to-shoot ratio of Teucrium chamaedrys (wall