Microscopic hypersensitive response (HR) in hpa1
-transformed T-34 and untransformed Z35 20 days after root inoculations with Verticillium dahliae. (a) Leaves of uninoculated untransformed Z35. (b) Leaves of uninoculated hpa1
-transformed T-34. (c) Leaves of untransformed Z35 inoculated with V. dahliae. (d) Leaves of hpa1
-transformed T-34 inoculated with V. dahliae (red arrow indicates microscopic HR). (a), (b), (c), and (d) scale bars = 1 μm. The experiment was repeated three times.