Hot-water Treatment and Indole-3-butyric Acid Stimulates Rooting and Shoot Development of Tropical Ornamental Cuttings

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  • 1 Dept. of Entomology, College of Tropical Agriculture and Human Resources, University of Hawaii at Manoa, 461 West Lanikaula St. Hilo, HI 96720.
  • | 2 Dept. of Horticulture, College of Tropical Agriculture and Human Resources, University of Hawaii at Manoa, 461 West Lanikaula St. Hilo, HI 96720.
  • | 3 Dept. of Entomology, College of Tropical Agriculture and Human Resources, University of Hawaii at Manoa, 461 West Lanikaula St. Hilo, HI 96720.

Frangipani (Plumeria hybrid `Donald Angus') cuttings immersed in hot water (49C for 10 min) followed by 0.8% indole-3-butyric acid (IBA) basal treatment (hot water + IBA) had greater root length and weight compared to the nontreated control, hot water, or IBA treatment alone. Greater percentage of rooting and number of roots per cutting were observed for hot-water-treated + IBA-treated cuttings compared to the non-treated control and hot-water treatment alone. In a second study, Dracaena fragrans (L.) Ker-Gawl. `Massangeana', D. deremensis Engl. `Warneckii', D. deremensis Engl. `Janet Craig', D. marginata Lam., and cape jasmine (Gardenia jasminoides Ellis) cuttings displayed results similar to those observed with Plumeria cuttings. In addition to enhancing rooting, hot water + IBA also stimulated the number of shoots per cutting on anthurium (Anthurium andraeanum Andre `Marian Seefurth'), croton [Codiaeum variegatum (L.) Blume var. pictum (Lodd.) Mull. Arg.], D. marginata, D. fragrans, Plumeria, and ti (Cordyline terminalis `Ti') cuttings.

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