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Subramanian Venkatesan Poomaruthai Masilamani Tamilmani Eevera Ponnusamy Janaki Sendrayaperumal Sundareswaran Perumal Rajkumar

Abstract

Poor seed germination is a major issue in teak (Tectona grandis) propagation. Teak seed dormancy is thought to be the reason for delayed germination. So far, specific dormancy mechanisms have not yet been identified. In order to study the influence of presowing treatments on germination, seedling vigour, and biochemical attributes of fresh teak drupes collected from the seed production area of Top Slip in Tamil Nadu. The collected drupes were subjected to different presowing treatments viz., T1 - control, T2 - soaking and drying for 6 days, T3 – T18 (soaking and drying for 5 days + soaking in different concentrations of thiourea, potassium nitrate,  hydrogen peroxide and calcium oxychloride for 12 hours). Treated drupes were placed for germination in earthen pots and kept in open sunlight. In parallel, true seeds extracted from untreated drupes were also subjected to germination under in vitro conditions as a check. A higher percentage of germination (40%) was recorded in true seeds under in vitro conditions when compared to the treated and untreated drupes under in vivo conditions. Among the treated drupes sown under in vivo conditions, the drupes given soaking + drying for 5 days + soaking in 2% calcium oxychloride (CaOCl2) recorded higher germination (17.16) with better seedling vigour. Analysis of teak true seeds and mesocarp extract in high-performance liquid chromatography showed that gibberellic acid was found only in true seeds, whereas the other compounds, viz., indole-3-acetic acid, indole butyric acid, abscisic acid and coumarin, were not present in the true seed or mesocarp.

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Keywords

Biochemical constituent, Germination, Presowing treatment, Teak drupe, True seeds

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Venkatesan, S. ., Masilamani, P. ., Eevera, T. ., Janaki, P. ., Sundareswaran, S. ., & Rajkumar, P. . (2022). Effect of presowing seed treatments on teak (Tectona grandis L. F) drupes dormancy and germination. Journal of Applied and Natural Science, 14(1), 172–179. https://doi.org/10.31018/jans.v14i1.3316
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