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Rooting response of 'Rspberry Ice' bougainvillea (Bougainvillea spectabilis Willd.) to indole butyric acid treatment and cutting type
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Nematollah Etemadi *   , Mehdi Ghaedamini , Maryam Haghighi , Rahim Amirikhah , Leyla Cheheltanan |
| Department of Horticulture, Collage of Agriculture, Isfahan University of Technology |
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Abstract: (189 Views) |
'Raspberry ice' bougainvillea with colorful and beautiful bracts has great significance in landscape design and green spaces. Cutting propagation is the most cost-effective method in this plant but the cuttings are difficult to root. Therefore, the aim of this research was to investigate the effect of two types of cutting (hardwood and semi- hardwood cuttings) and different concentrations of indole butyric acid (0, 1000, 2000, 3000, 4000 mg L-1) to improve the rooting of 'Raspberry Ice' bougainvillea cuttings. This experiment was carried out in a factorial design based on completely randomized design with three replications. The results showed that the rooting percentage, root and shoot length, number of roots, leaves and lateral branches, root and shoot fresh and dry weight in hardwood cuttings were higher than in semi-hardwood cuttings. The starch and soluble carbohydrate content in semi- hardwood cuttings were 35.10% and 73.24% higher than in hardwood cuttings, respectively. The highest percentage of rooting was related to the application of 1000 mg L-1 indole butyric acid in woody cuttings, which showed an 84.53% increase compared to the corresponding control treatment. The lowest percentage of rooting was related to the application of indole butyric acid at 4000 mg. L-1 on semi-hardwood cuttings, not significantly different comparec to control treatment. The application of 1000 mg L-1 indole butyric acid resulted in a 41.58% and 45.28% increase in the number of lateral branches and leaves compared to the control. The application of higher concentrations of indole butyric acid, especially at 4000 mg L-1, had a negative effect on the root and growth characteristics of the plant. Furthermore, the lowest starch and soluble carbohydrate content were related to the treatments of 2000 and 1000 mg L-1 of indole butyric acid, indicating the breakdown of these compounds to provide the necessary materials for improving root formation and growth of 'Raspberry Ice' bougainvillea cuttings. In general, the use of hardwood cuttings and the application of 1000 and 2000 mg L-1 indole butyric acid had a positive effect on the growth and rooting characteristics of 'Raspberry Ice' bougainvillea. |
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| Keywords: 'Raspberry Ice' bougainvillea, Indole butyric acid, Rooting, Semi-Hardwood cutting, Hardwood cutting |
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Type of Study: Research |
Subject:
Special
Received: 2024/06/16 | Accepted: 2024/12/30 | Published: 2025/04/28
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