Figure 4.

Resistance Spectrum of Xa3/Xa26-2 and Xa3/Xa26-3 to Xoo at Adult (Booting) and Seedling (Six-Leaf) Stages.All the transgenic plants carried a single copy of transgene. D101OM43, D103OM26, and D103OM42 are resistance T₁ transgenic plants. D101OM1-4 is resistance T₂ transgenic plants. D101OM1-20 and M103OM26-9 are homozygous resistance transgenic lines (T₃ generation). Rb49 is a resistance transgenic line carrying Xa3/Xa26 regulated by its native promoter with the genetic background of Mudanjiang 8 (Cao et al. 2007a). Bars represent mean (6–10 replicates for D101OM and D103OM and 3–5 replicates for Rb49 and wild-type at booting stage and 3–6 replicates at six-leaf stage) ± standard deviation. The ‘a’ or ‘b’ indicates that a significant difference between transgenic and wild-type was detected at P < 0.01 or P < 0.05, respectively. The ‘c’ or ‘d’ indicates that a significant difference between the Xa3/Xa26-2-carrying or Xa3/Xa26-3-carrying plants and Xa3/Xa26-carrying plants was detected at P < 0.01 or P < 0.05, respectively.