TITLE:
Indolbutyric Acid and Time of the Year Influence on Rooting of Chrysanthemum Cuttings
AUTHORS:
Marina Romano Nogueira, Marcos Vieira Ferraz, Amanda Kelly Dias Bezerra, Renata Bachin Mazzini-Guedes, Carla Rafaele Xavier Costa, Lívia Caroline Praseres de Almeida, Suzana Targanski Sajovic Pereira, Kathia Fernandes Lopes Pivetta
KEYWORDS:
Dendranthema grandiflora, Cutting, Asexual Propagation
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.3,
February
27,
2018
ABSTRACT: The objective of this study was to analyze the
effect of the seasons and indol butyric acid (IBA), as well as the preparation of IBA
solutions on rooting growth of “Fine Time” chrysanthemum cuttings. The
first experiment was arranged in a 4 × 2 factorial
scheme: IBA concentrations (0, 1000, 2000 and 3000 mg·L-1) during summer and winter with 4
replicates of two pots and six cuttings per pot. In the second experiment, the storage
of IBA solution (1000 mg·L-1) at 15°C was studied with four replicates of 10
cuttings per plot in a period of four weeks. In the third experiment, dilution
and supply of IBA (1000 mg·L-1 or 1000 mg·kg-1)
were studied; there were eight treatments: (1) IBA mixed with industrial talc;
(2) IBA diluted in 50% alcohol and oven dried at 30°C; (3) IBA diluted in 50% alcohol and oven dried at 70°C; (4) IBA diluted in NaOH and supplied via
aqueous solution; (5) IBA diluted in acetone and supplied via aqueous solution;
(6) IBA diluted in alcohol 92.8% and supplied via alcoholic solution; (7) IBA
diluted in alcohol 50% and supplied via alcoholic solution; (8) IBA mixed and
supplied via lanolin; with four replicates of 10 cuttings per plot. Twenty-one
days after cutting implementation, the following variables were evaluated:
rooting percentage, number, average length and root dry mass. Statistical
analysis and time-of-year averages were compared using the Tukey test at 5%;
polynomial regression for IBA concentration and preparation data. The means of
dilution and delivery were compared by the Scott-Knott test. Treatment with IBA
at a concentration of 3000 mg·kg-1 resulted in 90% rooting in the winter and 100% in the
summer for all treatments. Results suggest the concentration of 2000 mg·L-1 in the summer and 2000 and 3000 mg·L-1 during the winter provided better
quality for the root system. Cuttings treated with IBA diluted in 50% alcohol
and oven dried at 30°C showed higher number, length and vigor of
the roots.