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Background  In saffron ( Crocus sativus ), new corms develop at the base of every shoot developed from the maternal corm, a globular underground storage stem. Since the degree of bud sprouts influences the number and size of new corms, and strigolactones (SLs) suppress growth of pre-formed axillary bud, it was considered appropriate to investigate SL involvement in physiology and molecular biology in saffron. We focused on two of the genes within the SL pathway,  CCD7  and  CCD8 , encoding carotenoid cleavage enzymes required for the production of SLs.    Results  The  CsCCD7  and  CsCCD8  genes are the first ones isolated and characterized from a non-grass monocotyledonous plant.  CsCCD7  and  CsCCD8  expression showed some overlapping, although they were not identical.  CsCCD8  was highly expressed in quiescent axillary buds and decapitation dramatically reduced its expression levels, suggesting its involvement in the suppression of axillary bud outgrowth. Furthermore, in vitro experiments showed also the involvement of auxin, cytokinin and jasmonic acid on the sprouting of axillary buds from corms in which the apical bud was removed. In addition,  CsCCD8  expression, but not  CsCCD7 , was higher in the newly developed vascular tissue of axillary buds compared to the vascular tissue of the apical bud.    Conclusions  We showed that production and transport of auxin in saffron corms could act synergistically with SLs to arrest the outgrowth of the axillary buds, similar to the control of above-ground shoot branching. In addition, jasmonic acid seems to play a prominent role in bud dormancy in saffron. While cytokinins from roots promote bud outgrowth. In addition the expression results of  CsCCD8  suggest that SLs could positively regulate procambial activity and the development of new vascular tissues connecting leaves with the mother corm.

Apical dominance in saffron and the involvement of the branching enzymes CCD7 and CCD8 in the control of bud sprouting