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The effects of 2,4-dichlorophenoxy acetic acid and isoproturon herbicides on the mitotic activity of wheat (Triticum aestivum L.) root tips

The effects of the herbicides 2,4-dichlorophenoxy acetic acid and isoproturon on 3 wheat (Triticum aestivum L.) varieties (HUW 234, HUW 468, and HUW 533) were studied with regards to mitotic abnormalities and chromosomal behavior. | Turk J Biol 34 (2010) 55-66 © TÜBİTAK doi:10.3906/biy-0802-5 The effects of 2,4-dichlorophenoxy acetic acid and isoproturon herbicides on the mitotic activity of wheat (Triticum aestivum L.) root tips Sanjay KUMAR1,*, Shashi Kiran ARYA2, Bijoy Krishna ROY2, Atul Kumar SINGH3 1Department of Botany, Nagaland University, Headquarter, Lumami, Nagaland-798601, INDIA 2Center of Advance Study in Botany, Banaras Hindu University, Varanasi-221005, INDIA 3College of Biotechnology and Allied Science, Allahabad Agricultural Institute, Deemed University, Allahabad-211007, INDIA Received: 08.02.2008 Abstract: The effects of the herbicides 2,4-dichlorophenoxy acetic acid and isoproturon on 3 wheat (Triticum aestivum L.) varieties (HUW 234, HUW 468, and HUW 533) were studied with regards to mitotic abnormalities and chromosomal behavior. Pre-soaked seeds were treated with both herbicides at concentrations of 50-1200 ppm. Both 2,4-D and isoproturon were highly mito-inhibitory and induced chromosomal abnormalities, such as precocious movement, stickiness, and chromosome bridges, with and without laggards and fragments at the anaphase and telophase. The frequency of chromosomal anomalies in almost all the targets used was high at the maximum dose of both herbicides, individually as well as in combination. Isoproturon was more toxic, as it resulted in high-level chromosomal damage in all the varieties. Both herbicides had a dose-dependent impact on the mitotic index (MI) and relative abnormality rate (RAR). These parameters collectively indicate that variety HUW 468 was more susceptible to the mito-depressive and chromotoxic action of the 2 herbicides. Key words: Isoproturon, 2,4-dichlorophenoxy acetic acid, Tritium aestivum L., chromosomal abnormalities, mitosis, relative division rate (RDR), relative abnormality rate (RAR) Buğday kök uçlarına (Triticum aestivum L.) 2,4-diklorofenoksi asetik asit ve izoproturon herbisitinin etkisi Özet: Üç buğday (Triticum aestivum L.) .