Fig. 2.

Inhibition of ethylene action reduces the numbers of SCNs that develop on soybean roots, and addition of ethylene increases the number. (A) Continuous exposure of SCN-inoculated monoxenic roots to no inhibitors (control), 2 μl l⁻¹ 1-MCP, 5000 μl l⁻¹ NBD, or 1 μl l⁻¹ ethylene. (B) Exposure of monoxenic roots to 5000 μl l⁻¹ NBD for 10 d intervals preceded or followed by exposure to air with no inhibitor, or continuous exposure of roots to 5000 μl l⁻¹ NBD for 30 d or to 5000 μl l⁻¹ NBD plus 100 μl l⁻¹ ethylene. (C) Continuous exposure of monoxenic roots to 2000 μl l⁻¹ NBD or 2000 μl l⁻¹ NBD plus 25 μl l⁻¹ ethylene.