Abstract
Poor seed germination is a significant problem for propagation of teak and it particularly hampers the deployment of genetically improved material into plantations. Seed dormancy is the putative cause for delayed and sporadic germination of teak seed but specific dormancy mechanisms have not been proven. In this paper we investigate whether physical or mechanical dormancy could affect teak germination. Physical dormancy was disproved when we observed water in every examined locule of fruit which had been immersed for 12–24 h (n = 1,700 fruits from six diverse sources). Mechanical dormancy was found to affect teak seed germination by means of valve structures which must open for the radicle to emerge. All 1,450 germinating seeds in 16 samples emerged from the endocarp via the detachment of a valve. Germination over 16 days was compared between extracted seeds (ex situ) and seeds within their endocarp (in situ) to determine the effect of mechanical dormancy on germination. Significantly greater germination of the ex situ seeds (62 ± 2% SE; n = 486) than of the in situ seeds (32 ± 2% SE; n = 564) indicated that mechanical dormancy is an important factor in the poor germination of teak.
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References
Agboola DA (2000) Studies on the germination inhibitors in the fruits of four tropical tree species. Glob J Pure App Sci 6:27–30
Dabral SL (1976) Extraction of teak seed from fruit, their storage and germination. Indian For 102:650–658
Evans J, Turnbull J (2004) Plantation forestry in the tropics. Oxford University Press
Graudal L, Kjaer ED, Suangtho V, Kaosa-ard A, Sa-ardarvut P, Ponoy B (1998) Conservation of forest resources of teak (Tectona grandis L.f.) in Thailand. Technical note No 51 Danida Forest Tree Centre, Humlebaek and Royal Forest Department, Bangkok
Gupta BN, Pathanath PG (1975) Factors affecting germination of teak seeds of eighteen Indian origins. Indian For 101:584–587
Hartmann HT, Kester DE, Davies FT, Geneve RL (1997) Plant propagation: principles and practices. Prentice Hall, Upper Saddle River
Hill AW (1933) The method of germination of seeds enclosed in a stony endocarp. Ann Bot 47:873–887
Joshi MD, Kelkar SP (1971) Germination of seed in dry teak (Tectona grandis L.). Preliminary studies in fruit development and seed dormancy. Indian For 97:210–216
Kadambi K (1972) Silviculture and management of teak. Bulletin 24 School of Forestry Stephen F. Austin State University, Nacogdoches 137 pp
Kaosa-ard A (1998) Teak breeding and improvement strategies. In: Teak for the future—proceedings of the second regional seminar on teak, 29 May–3 June 1995. FAO Regional office for Asia and the Pacific, Bangkok, Thailand, Yangon, Myanmar, pp. 61-81
Keiding H (1985) Seed Leaflet No. 4 Teak Tectona grandis Linn. f. Danida, Humlebaek, Denmark
Kittinanda SP (1967) Natural Regeneration of Teak in Lampang. In: Proceedings of the 1st for. Conference, Royal Forest Department, Bangkok
Mackenzie JA, Jones N (1998) Towards synchronous germination in teak. Paper presented in a workshop on “Teak Seed” from 28 to 31 May 1998 at tropical Forest Research Institute, Jabalpur (M.P.) India
Masilamani P, Dharmalingam C, Annadurai K (2002) Inhibitory effect of water extract of epicarp and mesocarp of teak on germination of some field crops. Ind J For 25:39–41
Nair CTS, Souvannavong O (2000) Emerging research issues in the management of teak. Unasylva 201
Ngulube M (1986) Preliminary study of germination of pretreated seed of teak (Tectona grandis) under nursery conditions in Zomba, Malawi. For Ecol Manage 17:147–151
Palupi ER, Owens JN (1998) Reproductive phenology and reproductive success of teak (Tectona grandis L.f.). Int J Plant Sci 159:833–842
Pandey D, Brown C (2000) Teak: a global overview. Unasylva 201
Prasad R, Kandya AK (1992) Handling of forestry seeds in India. Associated Publishing Company, New Delhi
Rajput A, Tiwari KP (2001) Effect of alternate chilling/heating on germination of fresh teak (Tectona grandis L.f.) drupes without scarification of felty mesocarp. Seed Sci Tech 29:57–64
Schmidt L (2000) Dormancy and pretreatment. Guide to Handling of Tropical and Subtropical Seed. Danida Forest Seed Centre, Humlebaek
Sivakumar V, Parthiban KT, Gurudev Singh B, Gnanambal VS, Anandalakshmi R, Geetha S (2002) Variability in drupe characters and their relationship on seed germination in teak (Tectona grandis L.f.). Silvae Genet 51:232–237
Suangtho V (1980) Factors controlling teak (Tectona grandis Linn. f.) seed germination and their importance to Thailand. Masters Thesis, Australian National University, Canberra
Tewari DN (1992) A monograph on teak (Tectona grandis Linn.f.). International Book Distributors, Dehra Dun
Tiwari CK, Sharma S, Verma RK (2004) Effect of fungicide and plant growth hormones on germination of teak (Tectona grandis). J Trop For Sci 16:25–34
Yadav JP (1992) Pre-treatment of teak seed to enhance germination. The Indian For 118:260–264
Acknowledgments
We thank Marie Connett and Elders Forestry Limited for funding this research and the PhD scholarship to support the principal author. We also thank Maxine Dawes and Peter Bligh-Jones for invaluable technical support and Bruce and Nathan Mager of Brooklet Nursery where some of the germination experiments were undertaken.
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Slator, N.J., Callister, A.N. & Doland Nichols, J. Mechanical but not physical dormancy is a cause of poor germination in teak (Tectona grandis L.f.). New Forests 44, 39–49 (2013). https://doi.org/10.1007/s11056-011-9298-0
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DOI: https://doi.org/10.1007/s11056-011-9298-0