Differential auxin concentration effects on rooting performance of various cutting types in Tecomella undulata (Roxb.) Seem

Document Type : Scientific Letters

Author

Natural Resources and Watershed Management Research Division, Bushehr Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Bushehr, Iran

10.22092/irn.2025.369428.1649

Abstract

The limitations of sexual reproduction and severe degradation of Tecomella undulata natural habitats in Iran require the development of vegetative propagation methods using rooting hormones. Semi-hardwood and hardwood cuttings (aerial and rhizome) were collected from natural habitats during May. A factorial completely randomized design was employed with two cutting types (stem and rhizome), two cutting types (semi-hardwood and hardwood), and three auxin treatments at varying concentrations (0, 1500, and 3000 mg L⁻¹), with six replicates. Cuttings were treated for 5 minutes with solutions containing indole-3-butyric acid (IBA), naphthalene acetic acid (NAA), or their combination (NAA+IBA), each mixed with 10 mL of Carbomer 940 gel to enhance solution adhesion. Treated cuttings were planted in plastic pots containing moist sandy substrate. Results showed that the NAA+IBA combination induced a 3-5 fold increase in rooting percentage of aerial cuttings compared to controls (16.33%). In contrast, rhizome cuttings exhibited consistent rooting success (>83.33%) regardless of auxin treatment, showing no statistically significant differences (p ≤ 0.05). These findings indicate that for T. undulata propagation: (1) aerial semi-hardwood and hardwood cuttings require NAA+IBA treatment at 1500 mg L⁻¹ for optimal rooting, while (2) rhizome cuttings root effectively without hormonal treatment.

Keywords

References

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Iran Nature
Volume 10, Issue 3 - Serial Number 52
September and October 2025
Pages 35-42

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