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2013 ASHS Annual Conference

13975:
K-Iba Concentration Regulated Rooting Quality and Plant Vigor of Prunus laurocerasus L.

Thursday, July 25, 2013: 3:00 PM
Springs Salon D/E (Desert Springs J.W Marriott Resort )
Yujie Yang, Central South University of Forestry and Technology, Changsha, Hunan, China
Donglin Zhang, University of Georgia, Athens, GA
Jinying Dong, University of Georgia, Athens, GA
Zhihui Li, Central South University of Forestry and Technology, Changsha, Hunan, China
Prunus laurocerasus L. is an evergreen species of Rosaceae, native to southwestern Asia and southeastern Europe. It is a widely cultivated ornamental plant in gardens and parks in temperate regions. A new type of branch sprout with 2–4 cm long and 0.5–1.5 cm broad leaves was collected and regenerated with the stem cuttings in November 2012. All cuttings were treated with K-IBA at 1000, 3000, and 8000 mg·L-1. K-IBA concentrations had significant influence on rooting quality and after growth of Prunus laurocerasus. The rooting percentage was very high, ranging from 94.4% to 100% after two months. Although the rooting percentage did not show a great difference, the number of roots and root length were highly affected. As the K-IBA concentrations increased, the number of roots increased significantly from 6 to 11 to 17.  However, root length had the opposite trend than that of root numbers. The longest root length, 21.9 cm, was obtained from cuttings treated with K-IBA at 1000 mg·L-1. Cuttings treated with K-IBA 1000 mg·L-1 had a mean root length of 6.2 cm, 4.8 and 1.9 cm for 3000 mg·L-1 and 8000 mg·L-1, respectively. Rooted cuttings were transplanted to one-gallon pots and placed in a heated greenhouse. The survival rate was recorded and dead cuttings were examined. The highest survival rate was 95.5% under K-IBA 1000 mg·L-1 treatment, while those treated with K-IBA 3000 mg·L-1 and 8000 mg·L-1 was 78.8% and 50.0%, respectively. Higher K-IBA concentrations might increase the number of roots, but kill the rooted cuttings or reduce the plant vigor afterward. For the propagation of Prunus laurocerasus, stem cuttings treated with K-IBA 1000 mg·L-1 are recommended.
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