Effect of 2,4-D on Seedling Physiology and Cytogenetical Studies in Triticum aestivum and Phalaris minor (Gramineae)

Effects of 2,4-D on seedling growth and chromosomal abnormalities were studied in Triticum aestivum and Phalaris minor. Seeds were soaked at different concentrations of 2,4 -D (0.01%, 0.1%, 1.0% ) for 4, 8, 12 and 16 hours. 2,4-D suppressed the germination more severely in P. minor than in T. aestivum. Shoot and root length was retarded with the increase of concentration and time of treatment in both species. Generally radical was more negatively affected than coleoptile and emergence of radical was not observed at 1.0% concentration at 8, 12, and 16 hours of treatment in T. aestivum while in P. minor there was a total lack of radical emergence at 1.0% concentration for all durations of treatment. Stiff and curled roots and undifferentiated callus like scutellar tissues were observed in T. aestivum, while in P. minor the coleoptile obtained was lean, pale green in colour and was lying flat on filter paper. Mitotic index decreased, while chromosomal abnormalities, bridges and laggards were increased with the increase of concentration and soaking time however, laggards were not observed in T. aestivum. Clumping and chain formation of chromosomes at metaphase was also noticed in P. minor.

作 者： Muhammad Rashid Khan Khawaja Muhammad Aslam   作者單位： Muhammad Rashid Khan(Department of Biological Sciences, Quaid-i-Azam University, Islamabad)

Khawaja Muhammad Aslam(Department of Botany, Azad Jammu and Kashmir University, Muzaffarabad, A. K) 

刊 名： 云南植物研究  ISTIC PKU 英文刊名： ACTA BOTANICA YUNNANICA  年，卷(期)： 2006 28(4)  分類號(hào)： Q945  關(guān)鍵詞： Triticum aestivum   Phalaris minor   2,4-D   Seedling grow   Chromosomal abnormality  

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