Environ Exp Biol (2018) 16: 315

Orginal Paper

Effect of Calcarisporium arbuscula on adventitious root development and peroxidase activity in two elepidote rhododendron cultivars

Kristine Dokane^1,2*, Dace Megre^1,3, Lelde Stirna^1,4, Karlis Dumins^1,5, Uldis Kondratovics^1,6

¹ Faculty of Biology, University of Latvia, Jelgavas 1, Riga LV–1004, Latvia
² Institute of Biology, University of Latvia, Miera 3., Salaspils LV–2169, Latvia
³ Department of Plant Ecophysiology, National Botanical Garden, Miera 1, Salaspils, LV–2169, Latvia
⁴ Latvian Plant Protection Research Centre, Struktoru 14A., Riga LV–1039 Latvia
⁵ Latvian State Forest Research Institute “Silava”, Rīgas 111, Salaspils, LV–2169 Latvia
⁶ Botanical Garden, University of Latvia, Kandavas 2, Riga LV–1083, Latvia
^* Corresponding author, E-mail: kristine.dokane@lu.lv

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Abstract

Effect of Calcarisporium arbuscula on adventitious root development in leaf-bud cuttings of two elepidote rhododendron cultivars was studied. Guaiacol peroxidase activity was determined and anatomical study was performed in untreated cuttings (control), and cuttings treated with 1% indole-3-butyric acid (IBA) or C. arbuscula. In rhododendron cv. ‘Babītes Lavanda’ both IBA and C. arbuscula treatment slightly delayed adventitious root formation; the overall rooting percentage remained high (94 and 92%, respectively) but lower than in the control (96%). IBA and C. arbuscula treatments had a strongly positive effect on long term survival of rooted cuttings (73 and 70%) compared to the control (58%). There was no difference in peroxidase activity between the treatments. In rhododendron cv. ‘Nova Zembla’, IBA and C. arbuscula treatments promoted formation of adventitious root initials and primordia as well as strongly increased rooting percentage (63 and 70%) compared to the control (38%). In addition, peroxidase activity was significantly higher in C. arbuscula treated cuttings during the whole experiment.

Key words: anatomy, fungal endophyte, leaf-bud cuttings, rhizogenesis.

Environ Exp Biol (2018) 16: 315–322

DOI: http://doi.org/10.22364/eeb.16.23

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Faculty of Biology, University of Latvia
				Hard copy: ISSN 1691–8088 On-line: ISSN 2255–9582 Environ Exp Biol (2018) 16: 315–322 DOI: https://doi.org/10.22364/eeb.16.23
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