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Unexpected abscission of flowers or fruits is a major limiting factor for crop productivity. Key genes controlling abscission in plants, especially in popular fruit trees, are largely unknown. Here we identified a litchi ( Litchi chinensis  Sonn.) IDA-like (INFLORESCENCE DEFICIENT IN ABSCISSION-like) gene  LcIDL1  as a potential key regulator of abscission.  LcIDL1  encodes a peptide that shows the closest homology to  Arabidopsis  IDA, and is localized in cell membrane and cytoplasm. Real-time PCR analysis showed that the expression level of  LcIDL1  accumulated gradually following flower abscission, and it was obviously induced by fruit abscission-promoting treatments. Transgenic plants expressing  LcIDL1  in  Arabidopsis  revealed a role of  LcIDL1  similar to  IDA  in promoting floral organ abscission. Moreover, ectopic expression of  LcIDL1  in  Arabidopsis  activated the expression of abscission-related genes. Taken together, our findings provide evidence that  LcIDL1  may act as a key regulator in control of abscission.

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Identification and molecular characterization of an IDA-like gene from litchi, LcIDL1, whose ectopic expression promotes floral organ abscission in Arabidopsis