Hypoxis hemerocallidea cormlet production in response to corm cutting and exogenous application of plant growth regulato
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RESEARCH REPORT
Hypoxis hemerocallidea cormlet production in response to corm cutting and exogenous application of plant growth regulators Motiki Meshack Mofokeng1,2 · Hintsa Tesfamicael Araya1,2 · Stephen Oluwaseun Amoo1 · Christian Phillipus du Plooy1 · Phatu William Mashela2 Received: 10 September 2019 / Revised: 22 May 2020 / Accepted: 17 June 2020 © Korean Society for Horticultural Science 2020
Abstract The study was undertaken to understand the effect of plant growth regulators (PGRs) on cormlet production in Hypoxis hemerocallidea corm cuttings. In the first experiment, conducted in spring and summer, whole corms and corms subjected to chipping into four or eight segments or to scooping were used. These were soaked in 1.0 g L − 1 indole-3-butyric acid (IBA), − 1 − 1 − 1 0.5 g L α-naphthalene acetic acid (NAA), a combination of 1.0 g L IBA and 0.5 g L NAA, or distilled water (control) for 16 h. In the second experiment, corms cut by chipping into eight segments were soaked in 25, 50, or 100 mg L− 1 of 6-benzyladenine (BA) or gibberellic acid (GA3), as well as their combinations (100 mg L− 1 GA3 + 25 mg L− 1 BA, 100 mg L− 1 BA + 25 mg L− 1 GA3) for either 30, 60, or 120 min. Soaking corm cuttings chipped into equal segments in distilled water significantly increased the number of cormlets compared to soaking in IBA or NAA. Chipping into eight segments and soaking in distilled water resulted in a significantly higher number of cormlets in the summer experiment. There were no significant differences in the number of cormlets when the eight segments of corm cuttings were soaked in BA and G A 3. − 1 Soaking the corm cuttings for 120 min in GA3 at 25 mg L resulted in all eight segments of the cuttings producing one cormlet each. This is the first report on vegetative propagation of H. hemerocallidea showing that PGRs’ had no positive effect on cormlet production. Keywords African potato · Benzyladenine · Gibberellic acid · Indole-3-butyric acid · Naphthalene-acetic acid · Vegetative propagation
1 Introduction Plant growth regulators (PGRs) are organic compounds applied in small quantities to promote, inhibit, or modify physiological processes in plants (Boldt 2008). They play an essential role in breaking dormancy, manipulating growth, sprouting, and promoting the production of good quality corms (Baskaran et al. 2009). Natural PGRs’ are important for plant growth and development, but they can Communicated by Tae-Ho Han, Ph.D. * Motiki Meshack Mofokeng [email protected] 1
Agricultural Research Council - Vegetable and Ornamental Plants (ARC-VOP), Private Bag X293, Pretoria 0001, South Africa
Green Technologies Research Centre, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa
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be substituted by synthetic ones (Roy et al. 2017). Application of cytokinins, for example, can stimulate the growth of axillary buds (Sajjad et al. 2015), gibberellic acid (GA3) can enhance cell division and elongation, and auxins can influence adventitious root formation in pl
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