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    • Figure 1. 

      Schematic illustration of intra- and interspecific hybridization by interference of self-incompatible (SI) and unilaterally incompatible (UI) responses. (a) Intraspecific and interspecific pollination could not produce ovules due to SI or UI barriers. (b) Intraspecific and interspecific hybridization by interfering with SI and UI responses. Knocking down SRK and FER signaling by AS-ODN and application of ROS scavenger and NO donor both enable the ovule development in interspecific or intraspecific hybridization.