An evaluation of some physiological and biochemical parameters resulting from interaction of herbicide trifluralin and mychorrizal colonization by Glomus versiforme in sunflower plants (cv. Lakomka)
Effects of different concentrations of herbicide trifluralin on physiological characters and growth of root and shoot, total protein, proline and free amino acids content in mycorrhizal (M) and non-mycorrhizal (NM) sunflower plants were studied under greenhouse conditions. Six different concentrations of trifluralin (0, 5, 10, 15, 20, 25 ppm) were used. The obtained results of 5-week-old plants indicated that the length of shoots and roots as well as their fresh and dry weight decreased in herbicide treated plants, and this was significant in high herbicide concentrations (15, 20, 25 ppm). Also, growth inhibition in M plants was less obvious than NM plants. The amounts of total protein content decreased both in roots and shoots according to the amount of applied herbicide. Total protein contents of roots were higher in M than NM plants. By increasing herbicide concentrations, proline and free amino acids content in shoots and roots increased. According to these results, it is suggested that this fungus (Glomus versiforme) can help sunflower plants to tolerate trifluralin toxicity.
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