Integration of Cold Signal Transduction Pathway Related to ABA 8'-hydroxylase in Arabidopsis
Abscisic acid (ABA) is one of plant hormones, playing essential roles in developmental regulation and stress signal transduction pathways, such as seed dormancy, seed germination, and environmental stress responses, etc. In recent years, the ABA 8’-hydroxylase was considered to play key role for ABA degradation. Arabidopsis P450 CYP707A subfamily genes were identified by reverse genetic approach to encode ABA 8’-hydroxylases (Kushiro et al., 2004; Saito et al., 2004). CYP707A subfamily includes four members in Arabidopsis, named CYP707A1 (At4g19230), CYP707A2 (At2g29090), CYP707A3 (At5g45340), and CYP707A4 (At3g19270). CYP707A genes were up-regulated by ABA, salinity, drought and osmotic stresses (Saito et al., 2004). However, there are no reports available about the interaction between CYP707A transcripts and cold stress.
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