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Background  IDA (INFLORESCENCE DEFICIENT IN ABSCISSION)-like signaling peptides and the associated HAE (HAESA)-like family of receptor kinases were originally reported in the model plant  Arabidopsis thaliana  (Arabidopsis) to be deeply involved in the regulation of abscission. Actually, IDA peptides, as cell-to-cell communication elements, appear to be implicated in many developmental processes that rely on cell separation events, and even in the responses to abiotic stresses. However, the knowledge related to the molecular machinery regulating abscission in economically important crops is scarce. In this work, we determined the conservation and phylogeny of the  IDA -like and  HAE -like gene families in relevant species of the Solanaceae family and analyzed the expression of these genes in the allopolyploid  Nicotiana benthamiana,  in order to identify members involved in abscission, stem growth and in the response to drought conditions.    Results  The phylogenetic relationships among the  IDA -like members of the Solanaceae studied, grouped the two pairs of NbenIDA1 and NbenIDA2 protein homeologs with the Arabidopsis prepropeptides related to abscission. Analysis of promoter regions searching for regulatory elements showed that these two pairs of homeologs contained both hormonal and drought response elements, although  NbenIDA2A  lacked the hormonal regulatory elements. Expression analyses showed that the pair of  NbenIDA1  homeologs were upregulated during corolla abscission.  NbenIDA1  and  NbenIDA2  pairs showed tissue differential expression under water stress conditions, since  NbenIDA1  homeologs were highly expressed in stressed leaves while  NbenIDA2  homeologs, especially  NbenIDA2B , were highly expressed in stressed roots. In non-stressed active growing plants, nodes and internodes were the tissues with the highest expression levels of all members of the  IDA -like family and their putative  HAE -like receptors.    Conclusion  Our results suggest that the pair of  NbenIDA1  homeologs are involved in the natural process of corolla abscission while both pairs of  NbenIDA1  and  NbenIDA2  homeologs are implicated in the response to water stress. The data also suggest that IDA peptides may be important during stem growth and development. These results provide additional evidence that the functional module formed by IDA peptides and its receptor kinases, as defined in Arabidopsis, may also be conserved in Solanaceae.

bmc plant biology

Differential expression of IDA (INFLORESCENCE DEFICIENT IN ABSCISSION)-like genes in Nicotiana benthamiana during corolla abscission, stem growth and water stress