Induction of dwarfing in bougainvillea cv Mahara by use of growth regulators
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Keywords:
Daminozide, Dwarfing, Flower index, Growth index, Internode distance, Maleic hydrazide, PaclobutrazolAbstract
Bougainvillea (Bougainvillea spectabilis) is a very popular evergreen landscape plant in tropical and subtropical areas. Because of the vigorous growth habit, bougainvillea needs a lot of labor-intensive pruning when being used as a potted plant. PGRs could be alternatives to frequent pruning on bougainvillea to reduce labor costs. But, little research has been carried out on the use of plant growth retardants (PGRs) for controlling the growth and flowering. The present investigations were carried out to study the effect of growth regulators mainly; paclobutrazol, daminozide and maleic hydrazide on bougainvillea cv Mahara to induce dwarfing. The experiment was laid out in completely Randomized Block Design with 11 treatments and four replications. The rooted cuttings of bougainvillea were planted on 7 July 2012 in earthen pot (10” diameter) containing potting media consisting of sand: soil: FYM in a ratio of 1:2:1. The plants were pruned to a uniform height of 10+2 inches on 3rd September 2012. The growth regulators were applied in the form of foliar spray or drench and data was recorded for vegetative and flowering traits. After 14 weeks, it was observed that there was a significant reduction in plant height and plant spread when paclobutrazol was applied in the form of spray or drench. However, application of maleic hydrazide inhibited the plant growth, on the contrary increased plant height and plant spread over control (Distilled water spray) was observed with 5000 ppm Daminozide (B-9) application. Drench application of paclobutrazol @30 ppm resulted in highest flower index as compared to other treatments.
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References
Aldrich J H and Norcini J E. 1996. Effect of plant growth regulators on growth of Barbara Karst bougainvillea. Proc. Fla. State Hort. Soc. 109: 3–4.
Barett J E and Nell T A. 1989. Comparison of paclobutrazol and uniconazole on floriculture crops. Acta Horticulturae 251: 275–290 DOI: https://doi.org/10.17660/ActaHortic.1989.251.38
Horowitz M. 1990. Comparison of paclobutrazol and uniconazole applied as a foliar spray and soil drench. Journal Mededelingen van de Faculteit Landbouwwetenschappen, Rijksuniversiteit. 55 (3): 1 241–8.
Karaguzel O. 1999. Effects of paclobutrazol on growth and flowering of Bougainvillea spectabilis WILLD. Turkish Journal of Agriculture and Forestry 23 (2): 527–32.
King R W, Seto H and Sachs R M. 2000. Response to gibberellins structural variants shows that ability to inhibit flowering correlates with effectiveness for promoting stem elongation of some plant species. Journal Plant Growth Regulators 19: 437– 44. DOI: https://doi.org/10.1007/s003440000015
Kobayashi K D, McConnel J and Griggis J. 2007. University of Hawaii at Manoa Ornamental and Flowers, Cooperative Extension Service OF-38.
Mansuroglu S, Karaguzel O, Ortacesme V and Selcuk Sayan M. 2009. Effect of paclobutrazol on flowering, leaf and flower colour of Consolida orientalis. Pakistan Journal of Botany 41(5): 2 323–32.
Rademacher W. 2000. Growth retardants: effects on gibberellin biosynthesis and other metabolic pathways. Annual Review of Plant Physiology 51: 501 (Abstract). DOI: https://doi.org/10.1146/annurev.arplant.51.1.501
Shao Z, Yang Y and Qiu S. 2006. The study of advance of flowering time regulator of Bougainvillea glabra. Chinese Agriultural Science Bulletin 22: 326–9.
Steffen J D, Sachs R M and Hackett W P. 1988. Bougainvillea inflorescence meristem development: comparative action of GA3 in vivo and in vitro. American Journal of Botany 75: 1225– 7. DOI: https://doi.org/10.1002/j.1537-2197.1988.tb08836.x
Tang Y, Zhu J, Huang Y and Liu Z. 2006. Flower period control techniques on Bougainvillea spp. Journal of China Forest Science 35: 36–9.
Whipker Brian E. 2013. New PGR Information Resources. Growers talk: Plant growth regulator guide, 37 p.
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