tailieunhanh - The effects of heavy metals on pollen germination and pollen tube length in the tobacco plant
This study was carried out to determine the effects of heavy metals (Ni, Fe, Pb, Co, Cd, Hg, Al, Zn and Cu) on pollen germination and pollen tube length in the tobacco plant (Nicotiana tabacum L.) cv. Karaba¤lar. The results showed that enhanced concentrations of heavy metals, except Fe, decreased the pollen germination rates and the pollen tube lengths. | Turk J Biol 26 (2002) 109-113 © TÜB‹TAK The Effects of Heavy Metals on Pollen Germination and Pollen Tube Length in the Tobacco Plant A. Levent TUNA, Betül BÜRÜN Mu¤la University, Faculty of Arts and Sciences, Department of Biology, Mu¤la - TURKEY ‹brahim YOKAfi Mu¤la University, Ortaca Vocational School, Mu¤la - TURKEY Esin ÇOBAN Mu¤la University, Faculty of Arts and Sciences, Department of Biology, Mu¤la - TURKEY Received: Abstract: This study was carried out to determine the effects of heavy metals (Ni, Fe, Pb, Co, Cd, Hg, Al, Zn and Cu) on pollen germination and pollen tube length in the tobacco plant (Nicotiana tabacum L.) cv. Karaba¤lar. The results showed that enhanced concentrations of heavy metals, except Fe, decreased the pollen germination rates and the pollen tube lengths. With Fe concentrations, on the other hand, first a positive, and then a negative relation was determined between the pollen characteristics examined. The most toxic effect on pollen germination was seen with the applications of Cu, Ni and Hg; on pollen tube length, on the other hand, a similar tendency was determined with the applications of Hg, Cd and Ni. The toxic effects of Co, Al and Fe were found to be low on both of the pollen characteristics. As a result, all the heavy metals examined prevented pollen germination and tube growth in the tobacco plant, but their toxicity levels varied. Key Words: Pollen Germination, Pollen Tube Length, Heavy Metals, Tobacco A¤›r Metallerin Tütün Bitkisinde Polen Çimlenmesi ve Polen Tüpü Uzunlu¤una Etkileri Özet: A¤›r metallerin (Ni, Fe, Pb, Co, Cd, Hg, Al, Zn ve Cu) tütün (Nicotiana tabacum L.) bitkisinde polen çimlenmesi ve polen tüpü uzunlu¤u üzerine etkileri araflt›r›lm›flt›r. Araflt›rma bulgular›na göre; Fe d›fl›nda di¤er a¤›r metallerin artan konsantrasyonlar›na ba¤l› olarak polen çimlenme oran› ve polen tüpü uzunlu¤unda azalma konsantrasyonlar› ile incelenen polen özellikleri aras›nda önce pozitif sonra .
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