UV-B-induced cADPR and IP3 synthesis was mediated by ABA.
cADPR and IP3 were involved in UV-B-ABA-induced isoflavone accumulation.
cADPR and IP3-induced isoflavone accumulation may be mediated by Ca2+.
ABA, cADPR, IP3 and Ca2+ could activate proteins expression of CHS and IFS.