Glyphosate-resistant Cotton and the Temporal and Spatial Expression of Resistance against Glyphosate

Abstract

Abstract: As a nonselective herbicide, glyphosate control weeds through the competitive inhibition on the activity of 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPS) in the shikimic acid pathway. Although glyphosate- resistant (GR) cotton can be developed in several ways, the most popular GR cotton that has been utilized in agricultural production is transgenic cotton containing CP4-EPSPS gene from Agrobacterium spp under the cauliflower mosaic virus (CaMV)-35s promoter. GR cotton exhibits an excellent vegetative resistance to glyphosate throughout the growing season. However, exposing GR cotton to glyphosate after the 4th-leaf stage can decrease boll setting due to reduced self pollination, suggesting occurrence of temporal and special changes in glyphosate-resistance. The sensitivity of the male reproductive organs to glyphosate is explained by reduced expression of CP4-EPSPs genes, and increased accumulation of glyphosate in these reproductive organs relative to vegetative organs. Enhancement of strong expression in the whole plant is an efficient way to improve reproductive resistance of GR cotton to glyphosate.

CLC Number:

S562

Dong Hezhong, Dai Jianlong,. Glyphosate-resistant Cotton and the Temporal and Spatial Expression of Resistance against Glyphosate[J]. Chinese Agricultural Science Bulletin, 2007, 23(2): 355-355.

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