Abstract: Crop production is a process of photosynthates transportation from source to sink. The movement of photosynthates in plant vascular bundle could drive the movement of plant signaling molecules, such as hormone, transcription factor, peptides and RNAi. In reverse-breeding programs, two key steps including inhibition of chromosome recombination and selective elimination of chromosome could be manipulates by these signal. Recent advances in identifying these long-distance signals targeting flower tissues can be applied to reverse-breeding technique.

Key words: source-path-sink, vascular bundle, phloem, reverse breeding, long distance movement