Glyphosate Tolerance Comparision of Field Bindweed (Convolvulus arvensis) Population from Different Areas

Effects of glyphosate on growth and shikimiac acid content of field bindweed(Convolvulus arvensis) in Beijing and Hebei province population were studied under greenhouse.Field bindweed populations in different areas presented a widely tolerance to glyphosate.Hebei yuanshi population presented the maximal tolerance to glynhosate with a GR50 value of 957.65 g a.i./hm2,while Beijing haidian population presented a relatively sensitivety to glyphosate with a GR50 value of 957.65 g a.i./hm2.Shikimic acid accumulation in hebei yuanshi population was slow and the plants could be recorered to maintain normal growth after 14 days for glyphosate treatment with a dosage of 922.5 g a.i./hm2;nevertheless,that of Beijing haidian population rapidly reached to maximum value after 7 days for glyphosate treatment and the plant growth was inhibited to some extent.Shikimic acid content and accumulation and tolearance to glyphosate in field bindweed presented a negative relationship,so the level of glyphosate tolerance of field bindweed in different population could be determined by detecting the content of shikimic acid after glyphosate treatment.