Figure 1.dnf2-4 displays typical features of defense reactions. Pictures show Wild Type (WT) R108 (A and C) and dnf2-4 (B) nodules 4 weeks after inoculation with Sinorhizobium meliloti 2011 (A and B) or its ΔnifH derivative (C). WT R108 shows big, pink nodules with WT strain and small, white nodules with Sm2011ΔnifH strain. In contrast to the fix- nodule shown in (C), dnf2 nodules show necrotic aspect. Scale bars: 1 cm.
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