Viability Loss of Recalcitrant Brant’s Oak (Quercus brantii Lindl.) Acorns during Overwintering
محورهای موضوعی : Ecology
Ali Soltani
1
(Department of Forest Science, Faculty of Natural Resources and Earth Sciences, Shahrekord University,
Shahrekord, Iran P.O.Box: 115)
کلید واژه: Zagros, Cold Storage, Seed moisture, Seed fate,
چکیده مقاله :
The lack of germination success and subsequent seedling recruitment of recalcitrant acorns of Brant’s oak (Quercus brantii) has been described as one of the main reasons for the cessation of sexual regeneration in Zagros forests. What happens to acorns whose viability is immediately lost is examined in the form of overwintering. In this study, overwintering conditions following seed dispersal were simulated by subjecting freshly harvested acorns with three moisture content levels (85, 90 and 100% fully hydration) at 3°C for up to three months. The results indicated that Brant’s oak acorns are totally recalcitrant and show no signs of dormancy. Their viability depended entirely on the moisture content. Fully hydrated acorns maintained a viability rate of more than 80% after three months of overwintering. This time period for acorns with 95% full hydration lasted only one month. At 90% fully hydration, the viability rate of acorns decreased almost immediately to less than 80%, and to less than 50 and 20% after 1 and 3 months, respectively. The passage of time was deteriorating during overwintering and its negative effects accelerated after one month, even for fully hydrated acorns.
Aizen MA, Woodcock H (1996) Effects of acorn size on seedling survival and growth in Quercus rubra following simulated spring freeze. Canadian Journal of Botany. 74(2), 308-314.
Akbari H, Gudarzi D, Sohrabi SR (2001) A study of the effect of moisture -temperature factors on germination of oak (Quercus brantit) seeds in khorramabad, lorestan province. Iranian Journal of Natural Resources. 54(3), 247-255.
Alvaninejad S, Tabari M, Taghvae M, Espahbodi K, Hamzepour M (2009) Effect of desiccation on germination and vigor of Manna Oak (Quercus brantii Lindl.) acorns. Iranian Journal of Forest and Poplar Research. 16(4), 574-582.
Benamirouche S, Chouial M, Messaoudene M (2018) Storage of Cork oak (Quercus suber L., 1753) acorns and effect of storage duration on seedlings vigour: artificial regeneration implications. Revue d'Ecologie. 73(1), 80-95.
Carvell KL, Tryon EH (1961) The Effect of environmental factors on the abundance of oak regeneration beneath mature oak stands. Forest Science. 7(2), 98-105.
Chaharmahal Va Bakhtiari Meteorological Administration (2020) Ardal Synoptic Meteorological Station. Partly available online at www.chbmet.ir.
Fattahi M (1994) Investigation of the Zagros oak forest and the most important factors of its destruction. Research Institute of Forests and Rangelands Press, Tehran - Iran
Finch-Savage WE, Clay HA (1994) Water relations of germination in the recalcitrant seeds of Quercus robur L. Seed Science Research. 4(3), 315-322.
Ganatsas P, Tsakaldimi M (2013) A comparative study of desiccation responses of seeds of three drought-resistant Mediterranean oaks. Forest Ecology and Management. 305,189-194.
Heydari M, Atar Roushan S, Mahdavi A (2012) The relationship between natural regeneration oak (Quercus brantii) and the environmental factors in Ghalarang's forests, Ilam province. Journal of Sciences and Techniques in Natural Resources. 7(1), 27-42.
Jazireie MH, Ebrahimi Rostaghi M (2013) Silviculture in Zagros. University of Tehran Press, Tehran - Iran. pp. 560.
Johnson PS, Shifley SR, Rogers R, Dey DC, Kabrick JM (2019) The Ecology and Silviculture of Oaks. CABI Publications. Oxfordshire. pp. 573.
Landis TD (1990) The Container Tree Nursery Manual - Volume 674. U.S. Department of Agriculture, Forest Service, p.199.
Leon-Lobos P, Ellis R (2018) Comparison of seed desiccation sensitivity amongst Castanea sativa, Quercus ilex and Q. cerris. Seed Science and Technology. 46(2), 233-237.
Macchia F, Cavallaro V, Vita F, Sburlino G (1992) Acorn Dormancy and Aridity as Factors of Quercus Cerris L. Distribution. In: Teller A, Mathy P, Jeffers JNR (eds) Responses of Forest Ecosystems to Environmental Changes. Springer, Dordrecht. pp. 633-634
Matsuda K, McBride JR (1989) Germination characteristics of selected California oak species. The American Midland Naturalist. 122(1), 66-76.
Noland T, Morneault A, Dey D, Deugo D (2013) The effect of storage temperature and duration on northern red oak acorn viability and vigour. Forestry Chronicle. 89,769-776.
Sagwal SS (2020) Forest Tree Seeds: Handbook. Scientific Publishers, Jodhpur. pp. 98.
Soltani A, Sadeghi Kaji H, Kahyani S (2020) Effects of different land-use systems (grazing and understory cultivation) on growth and yield of semi-arid oak coppices. Journal of Forestry Research. 31(6), 2235-2244.
Steele MA (2021) Oak Seed Dispersal: A Study in Plant-Animal Interactions. Johns Hopkins University Press, Baltimore, Maryland. pp. 431.
Suszka B Storage conditions for woody plant seed with a high water content. Proceeding IUFRO International symposium "Forest tree seed storage", Petawawa, Ontario, Canada, September 23-27, 1980 1980. Petawawa National Forestry Institute.
Suszka B, Tylkowski T (1980) Storage of acorns of the English oak (Quercus robur L.) over 1-5 winters. Arboretum Kórnickie. 25,199-229.
Vahdati K, Aslamarz AA, Rahemi M, Hasani D, Leslie CA (2011) Mechanism of seed dormancy and its relationship to bud dormancy in Persian walnut. Environmental and Experimental Botany. 70, 74– 82.
Yadegari L, Seyedi N (2019) Effect of altitude on seed germination and biomass of Quercus brantii. Journal of Forest Research and Development. 5(2), 405-417.
Zolfaghari R, Fayyaz P, Nazari M, Valladares F (2013) Interactive effects of seed size and drought stress on growth and allocation of Quercus brantii Lindl. seedlings from two provenances. Turkish Journal of Agriculture and Forestry. 37(2), 361-368.
