• Propogation and Nursery Production Studies With New Arid Land Species

      Miller, W. B.; Bailey, D. A.; Palzkill, D. A.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
      Several species of low -water requiring species have been successfully propagated through vegetative and sexual means. Auxin treatments and bottom healing were beneficial in many cases. Development of improved propagation schemes, and subsequent growing practices, will increase grower success and profitability, eventually increasing availability of new low water use plants to the Arizona consumer. The long-term result of this work will be the availability of new, low-water use plant species which may be utilized by the homeowner and landscape contractor. The addition of new and exciting plant materials to the consumer market, it is hoped will accelerate the use of arid species in the Arizona landscape, resulting in water savings throughout the state, particularly in urban areas.
    • Propogation of Baja Fairy Duster (Calliandra Californica) by Stem Tip Cuttings

      Bailey, D. A.; Miller, W. B.; Palzkill, D. A.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
      Stem tip cuttings of Calliandra californica were treated, prior to rooting with 0, 4,000, 4000, 12,000 or 16,000 ppm IBA in a talc formulation. Rooting was enhanced by application of 12,000 and 16,000 ppm IBA. Root system fresh weight increased with increasing concentration of IBA. No treatment effected percent survival of cuttings.
    • Rooting of Stem Cuttings of Mortonia scabrella

      Palzkill, D. A.; DePaul, L.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
      Mortonia scabrella can be successfully propagated by stem -tip cuttings during May to September. Better rooting seems to occur during the less stressful months of May and September than in mid-summer. A wide range of rooting response occurs between different clones; the best will root in the range of 70-80%, which should be acceptable in a commercial propagation situation. In one cycle of selection in which the best 3 out of 16 clones were selected for a repeat study, average rooting success increased from 6% to 33 %. Apparently genetic differences for rooting potential occur. Further selection from larger populations, and/or breeding for this trait should result in cutting propagation becoming relatively easy for this species.
    • Seed Germination Response of Penstemon spp. To Gibberellic Acid

      Palzkill, D. A.; DePaul, L.; Sivilli, C.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
      Treatment of seed with gibberellic acid (GA) resulted in significant increases in germination percent for Penstemon ambiguous, P. barbatus, P. eatoni, P. palmeri, P. parryi. P. pseudospectabilis, P. secundiflorus, and P. strictus in one or both of two experiments which were conducted. Germination of several other species increased with GA treatment, but differences were not significant.