Mustafa YILMAZ

Depth of dormancy and desicction tolerance inAcer trautvetteri Medv. Seeds

Özet: Acer trautvetteri Türkiye ve Kafkasya'da yayılış gösteren doğal yapraklı ağaç türlerinden biridir. Türün tohum fizyolojisi üzerine yapılan bu ilk çalışma göstermiştir ki türün tohumunda fizyolojik dormansi bulunmakta ve dormansinin giderilebilmesi için yaklaşık üç ay katlamaya alınması gerekmektedir. Çimlenme yüzdesi, katlama süresine bağlı olarak önemli oranda artmıştır. Bir, iki ve üç ay soğuk işlemden sonra çimlenme yüzdeleri sırasıyla % 38.67, % 76.00, ve % 96.00 olarak gerçekleşmiştir. Tohum en az % 10 neme kadar güvenle kurutulabilmektedir. Tohumun nem içeriği % 3'e indiğinde bütün tohumlar canlılığını kaybetmiştir. Akçaağaç türleri tohum dormansisinin varlığı ve kurumaya karşı duyarlılık bakımından farklılıklar göstermektedir. Bu araştırma, A. trautvetter/nin tohum dormansisi bulunan ve tohumları kurumaya karşı toleranslı olan Akçaağaç türlerinden biri olduğunu göstermiştir.

Acer trautvetteri Medv.' nin tohumlarında dormansinin derinliği ve kurumaya karşı duyarlılık

Abstract: This first exploratory study on the seed physiology of Acer trautvetteri, a broadleaved tree found in Caucasia and northern Turkey, demonstrated that A. trautvetteri seeds exhibit physiological dormancy and require about 3 months of chilling for complete dormancy loss. Germination percentages significantly increased with the chilling duration and were 38.67%, 76.00%, and 96.00% after 1, 2, and 3 months of chilling, respectively. Moreover, while the seeds can be safely dried to at least 10% moisture content, reducing the moisture content to 3% killed all the seeds. Acer species exhibit different seed characteristics in terms of seed dormancy existence and desiccation sensitivity. This research showed that A. trautvetteri is one of the Acer species the seeds of which have seed dormancy and are desiccation tolerant. '

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Bewley, J.D. and M. Black. 1994. Seeds: Physiology of Development and Germination. Plenum Press, New York.
Bourgoin, A. and J.D. Simpson. 2004. Soaking, moist-chilling and temperature effects on germination of Acer pensylvanicum seeds Canadian Journal of Forest Research, 34: 2181-2185.
Browicz, K. 1988. Chorology of Trees and Shrubs in South-West Asia and Adjacent Regions. Volume Six, Polish Academy of Sciences, Institute of Dendrology, Polish Scientific Publishers, Poznan.
Connor, K.F. and F.T. Bonner. 2001. The effects of desiccation on seeds of Acer saccharinurn and Aesculus pavia: recalcitrance in temperate tree seeds. Trees, 15: 131-136.
Cram, W.H. and H.A. Worden. 1979. Maturity of maple and ash seed. Tree Planters Notes. 30 17-19.
Ellis, R.H., T.D.. Hong and E.H. Roberts 1985. Handbook of Seed Technology for Genebanks. Volume II. Compendium of Specific Germination Information and Test Recommendations. International Board for Plant Genetic Resources, Rome.
Greggains, V., W.E. Finch-Savage, W.P. Quick, and N.M. Atherton. 2000. Putative desiccation tolerance mechanisms in orthodox and recalcitrant seeds of the genus Acer. Seed Science Research, 10, 317-327.
Hong, T.D. and R.H. Ellis. 1990. A comparison of maturation drying, germination and desiccation tolerance between developing seeds of Acer pseudoplatanus L. and Acer platanoides L, New Phytologist, 116: 589-596.
Hong, T.D. and R.H. Ellis. 1996. A protocol to determine seed storage behaviour. 1PGRI Technical Bulletin No: 1, Rome.
International Seed Testing Association. 1996. International Rules for Seed Testing. Seed Science and Technology, 27, Supplement, Switzerland.
Jones, S.F. and P.G. Gosling. 1994. "Target moisture content" prechill overcomes the dormancy of temperate conifer seeds. New Forests, 8: 309-321.
Muller, C. and M. Bonnet-Masimbert 1989. Breaking dormancy before storage: an improvement to processing of beechnuts (Fagus sylvatica L). SST 17, 15-26.
Muller, C, E. Laroppe and M. Bonnet-Masimbert 1999. Further developments in the redrying and storage of prechilled beechnuts {Fagus sylvatica L): Effect of seed moisture content and prechilling duration. Annals of Forestry Science, 56: 49-57.
Piotto, B. and A. Di Noi. 2003. Seed Propagation of Mediterranean Trees and Shrubs. APAT, Rome.
Roberts, E.H. 1973. Predicting the storage life of seeds. Seed Science and Technology, 1: 499-514.
Suszka, B., C. Muller and M. Bonnet-Masimbert 1996. Seeds of Forest Broadleaves, From Harvest to Sowing. INRA, France.
Thomsen, K.A. 1997. The effect of harvest time and drying on dormancy and storability in beechnuts. In: Basic and Applied Aspects of Seed Biology. Proceedings of The Fifth International Workshop on Seeds, Reading, 1995, 45-51.
Toth, J. and P.W. Garrett. 1989. Optimum Temperatures for Stratification of Several Maple Species. Tree Planters Notes, 9-12.
Yaltırık, F. 1970. Türkiye'de akçağaçların yetişme yeri istekleri Üzerine Toplu Bakış ve Yetiştirme (Silvikültür) İmkanlarının İrdelenmesi [Site Caharacteristics and Silvicultural Aspects of Turkish Acer Species]. İ.Ü. Orman Fakültesi Dergisi, Seri A, 20: 81-90.
Yaltırık, F. 1971. Yerli Akçaağaç {Acer L.) Türleri Üzerinde Morfolojik ve Anatomik Araştırmalar [The Taxonomical Study on the Macro- and Micro-Morphological Characteristics of Indigenous Maples (Acer I.) in Turkey]. İ.Ü. Publication No:1661/179, İstanbul.
Yılmaz, M. 2005. Doğu kayını (Fagus orientalis Lipsky.) tohumlarının fizyolojisi üzerine araştırmalar [The Researches on the Physiology of Oriental Beechnuts (Fagus orientalis Lipsky.)] PhD Thesis, İstanbul University, Institute of Science, p. 170.
Zasada, J.C. and T.F. Strong. 2006. Acer L. Maple. Woody Plant Seed Manual [online]. Available from http://www.nsl.fs.fed.us/ wpsm/Acer.pdf [cited 4 April 2006].