LI Tao, MENG Dandan, YANG Weiping, GUO Shuiliang, FAN Jiequn. Early diagnosis of mesosulfuron-methyl phytotoxicity on wheat[J]. Chinese Journal of Pesticide Science, 2022, 24(4): 805-811. DOI: 10.16801/j.issn.1008-7303.2022.0041
    Citation: LI Tao, MENG Dandan, YANG Weiping, GUO Shuiliang, FAN Jiequn. Early diagnosis of mesosulfuron-methyl phytotoxicity on wheat[J]. Chinese Journal of Pesticide Science, 2022, 24(4): 805-811. DOI: 10.16801/j.issn.1008-7303.2022.0041

    Early diagnosis of mesosulfuron-methyl phytotoxicity on wheat

    • The phytotoxicity to current and subsequent crops is an important factor affecting the application of sulfonylurea herbicides. Mesosulfuron-methyl is one of the commonly used herbicides in wheat fields. For early diagnosis of phytotoxicity on wheat by mesosulfuron-methyl, the plant height, shoot fresh weight, malondialdehyde (MDA) content, proline (Pro) content, soluble sugar content, chlorophyll content, Fv/Fm, and root morphology were determined by a dose-response experiment in the greenhouse. The results showed that the wheat seedlings did not show dwarfing and inhibition until 10 days after mesosulfuron-methyl 30g/L OD (9-45 g/hm2) application. However, the contents of MDA, Pro, and soluble sugar, Fv/Fm, and root morphology had shown obvious changes 5 days after mesosulfuron-methyl application. The contents of MDA and Pro increased with the increase of mesosulfuron-methyl dosages. After being treated with mesosulfuron-methyl at 27 g/hm2 or more, the contents of MDA and Pro were significantly higher than control. The content of soluble sugar and Fv/Fm were more sensitive to the stress of mesosulfuron-methyl. After being treated with mesosulfuron-methyl at 9 g/hm2 or more, the soluble sugar content was significantly higher than control, while the Fv/Fm was significantly lower than control. Mesosulfuron-methyl applied at 9-45 g/hm2 also reduced the number of root tips, total root length, total root surface area, and total root volume of wheat seedlings. MDA, Pro, soluble sugar, Fv/Fm, and root morphology can be used as sensitive indicators for early diagnosis of mesosulfuron-methyl phytotoxicity on wheat seedlings.
    • loading

    Catalog

      /

      DownLoad:  Full-Size Img  PowerPoint
      Return
      Return