Fig. 4.

Semi-thin sections of midribs from infected wild-type and mutant A. thaliana lines. Different A. thaliana lines were indicated as follows: (A) wild-type, (B) Atseor1ko, (C) Atseor2ko, (D) Atseor1ko/Atseor2kd, (E) Atseor1kd/Atseor2ko, and (F) Atpp2-a1ko. In infected leaf tissues, massive production of new phloem components caused phloem hyperplasia. No obvious difference was recorded among the different plant lines. For each condition, at least five non-serial cross-sections from five samples were observed. p, phloem; x, xylem. Scale bars: 50 µm. (This figure is available in colour at JXB online.)