Plant-derived smoke solutions stimulate the growth of Lycopersicon esculentum roots in vitro |
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Authors: | JLS Taylor J van Staden |
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Institution: | (1) Natal University Research Unit for Plant Growth and Development, Department of Botany, University of Natal Pietermaritzburg, Private Bag X01, Scottsville, 3209, South Africa |
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Abstract: | Aqueous extracts of smoke, derived from Themeda triandra, a fire-climax grass, and Passerina vulgaris, a fynbos plant, stimulated the growth of primary root sections of tomato roots in suspension culture. The optimal dilution for both extracts was 1:2000. Several of the fractions obtained from TLC separation of the Themeda and the Passerina extracts significantly promoted primary root growth. The auxins naphthaleneacetic acid (NAA), indolebutyric acid (IBA) and indoleacetic acid (IAA) were found to stimulate the growth of the primary root axis, with IAA and NAA significantly promoting lateral root number. Similarly, the naturally occurring cytokinins, zeatin and its derivatives (zeatin-O-glucoside; dihydrozeatin and zeatin riboside) stimulated primary root length. Zeatin and dihydrozeatin promoted secondary root growth, but only at very low concentrations. |
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Keywords: | auxin cytokinin lateral root initiation plant-derived smoke solutions root growth tomato root suspension culture |
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