FIG. 3.

Foliar chlorosis of G. max cv. Lee inoculated with B. elkanii USDA94 (A), ΔrtxC (B), and Δrtx::Ω1 (C), photographed 30 days after inoculation. The contents of serinol in upper shoots were as follows: with USDA94, 4.5; with ΔrtxC, 2.8; with Δrtx::Ω1, <0.1 (nmol/g of fresh weight). The contents of dihydrorhizobitoxine in upper shoots were as follows: with USDA94, 8.4; with ΔrtxC, 5.1; with Δrtx::Ω1, <0.2 (nmol/g of fresh weight). The contents of rhizobitoxine in upper shoots were as follows: with USDA94, 3.6; with ΔrtxC, <0.1; with Δrtx::Ω1, <0.1 (nmol/g of fresh weight).