Abstract
This is the first report of induction of haploid callus with significant antioxidant activity from unpollinated ovary cultures of tea. Out of the five cultivars tested, TV18 gave the highest percentage of callus induction. Within 1 wk of induction, ovules swelled to almost double their original size, and white, friable callus emerged. A high cytokinin/auxin ratio, provided by 8.5 μM benzyl adenine and 4.5 μM 2,4-dichlorophenxyacetic acid, and high-temperature treatment (33°C) for 10 d in the dark promoted maximum callus induction. Callus was maintained on MS medium containing 22.2 μM benzyl adenine and 9.8 μM indolebutyric acid (callus line RM 1) in the light at 25°C. Well-developed tracheids were formed within 4 wk in callus subcultured on MS medium containing 1.8 μM thidiazuron and 5.0 μM 2,3,5-triiodobenzoic acid (line RM 2). Flow cytometric analysis revealed that most cells were haploid. Both RM 1 and RM 2 produced phenolic compounds with significant antioxidant capacity. Phenolic content showed a positive linear correlation with antioxidant activity. The total phenolic content of RM 1 was 3.47 ± 0.21 gallic acid equivalents (GAE) mg/g dry weight and that of RM 2 was 2.39 ± 0.12 GAE mg/g dry weight. Antioxidant activity was measured using IC50, a measure of inhibitory concentration; a lower IC50 value reflects greater antioxidant activity. The IC50 value of RM 1 was 2,530 μg/ml and that of RM 2 was 3,170 μg/ml. The results suggested that the phenolic compounds contributed significantly to the antioxidant capacity of the in vitro cell lines.
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We gratefully acknowledge the Department of Biotechnology (DBT), Government of India for providing financial assistance and Tocklai Experimental Station, Tea Research Association (TRA), Jorhat, Assam for providing access to the plant material.
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Editor: Pamela Weathers
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Rekha, H.R., Rakhi, C. Establishment of dedifferentiated callus of haploid origin from unfertilized ovaries of tea (Camellia sinensis (L.) O. Kuntze) as a potential source of total phenolics and antioxidant activity. In Vitro Cell.Dev.Biol.-Plant 49, 60–69 (2013). https://doi.org/10.1007/s11627-013-9490-3
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DOI: https://doi.org/10.1007/s11627-013-9490-3