The Strigolactone-Related Mutants have Enhanced Lamina Joint Inclination Phenotype at the Seedling Stage

Strigolactones(SLs)are a class of newly discovered plant hormones and play diverse roles in plant growth and development.Recently,it has been demonstrated that SLs negatively regulate shoot branching by inhibiting bud outgrowth in plants(Umehara et al.,2008).Several genes involved in SL biosynthesis or signaling had been identified in both monocots and dicots.Loss-of-function mutants corresponding to these genes exhibit enhanced shoot branching phenotype(Beveridge and Kyozuka,2010).In rice,the SL biosynthetic mutants,d17/htd1 and d10,are caused by mutation of carotenoid cleavage dioxygenase 7(CCD7)and carotenoid cleavage dioxygenase 8(CCD8),respectively(Zou et al.,2006;Arite et al,2007).The SL biosynthetic mutant,d27,is caused by a mutation of an