Sublethal Heavy Metal Stress Stimulates Innate Immunity in Tomato

Figure 2

Nitric oxide visualization in the leaf petiole sections of tomato by DAF-2DA stain, 24 h after CuCl₂ treatment. Generation of NO was detected by green fluorescence. (a) Control; (b) treatment with 1 mM CuCl₂; (c) treatment with 2.5 mM CuCl₂; and (d) treatment with 5 mM CuCl₂.

(a)  

(b)

(c)

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