الفهرس 
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Abstract
The present study has been carried out to investigate the interference of metribuzin, chlorimuronethyl and brominal with certain physiological and cytological aspects of flax (Linum usitatissimum L. Sakha 1). Broad bean (Vicia faba L. Giza 3) was added in the cytological studies as a comparable test plant. <U+2022> The application of all herbicides resulted in decreases in the fresh weight of shoots and roots and also appeared to exert a marked inhibitory action upon dry matter accumulation in shoots and roots of flax seedlings. The highest diminution was evident due to treatment with brominal. <U+2022> Chlorophyll a and b contents of flax seedlings were significantly reduced by all herbicides; the degree of reduction in chlorophyll a was greatest with metribuzin while the highest diminution in chlorophyll b content was found due to brominal. Also, Carotenoids content was significantly decreased in flax seedlings treated with all herbicides. <U+2022> In shoots of flax seedlings, anthocyanin content was subjected to non significant increase during the first three days after treatment with the three herbicides, afterwards, metribuzin and brominal induced significant increases up to the end of experiment. On the other hand, chlorimuronethyl induced non significant decreases in anthocyanin content up to the 6th day thereafter, a significant decrease was recorded. In roots, anthocyanin was increased with brominal and to a lesser extent with metribuzin. For chlorimuronethyl, non significant increase in anthocyanin content was recorded up to the 6th day and thereafter significant decreases were observed.<U+2022> Glucose in shoots and roots of flax seedlings were non significantly affected by chlorimuronethyl while both metribuzin and brominal caused significant decreases in glucose content. The content of sucrose in shoots and roots increased non significantly from the control after treatment with chlorimuronethyl allover the experimental period. On the other hand, metribuzin and brominal induced a significant reduction in sucrose content in shoots and roots. Total soluble sugars in both shoots and roots were significantly reduced by metribuzin and brominal. For chlorimuronethyl, the used dose induced non significant reduction in the content of total soluble sugars either in shoots or roots of flax seedlings. Polysaccharides content in shoots and roots of flax seedlings was variably reduced with metribuzin, chlorimuronethyl and brominal.