“…The DWARF27 (D27) gene, first characterized in rice, encodes an isomerase that acts at the initial steps of this pathway by transforming trans-b-carotene to 9-cis-b-carotene (Lin et al, 2009;Alder et al, 2012;Waters et al, 2012a). CAROTENOID CLEAVAGE DIOXYGENASE7 (CCD7) and CCD8 (HTD1/D17/ DAD3/RMS5/MAX3 and D10/DAD1/RMS1/MAX4, respectively) (Sorefan et al, 2003;Booker et al, 2005;Snowden et al, 2005;Johnson et al, 2006;Zou et al, 2006;Arite et al, 2007;Drummond et al, 2009;Pasare et al, 2013) produce carlactone, a putative intermediate compound in the pathway (Alder et al, 2012;Seto et al, 2014). The MORE AXILLARY GROWTH1 (MAX1) gene, so far identified only in Arabidopsis, encodes a cytochrome P450 monooxygenase that acts downstream of CCD7 and CCD8 (Booker et al, 2005).…”