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The phytohormone abscisic acid (ABA) and the lipoxygenases (LOXs) pathway play important roles in seed germination and seedling growth and development. Here, we reported on the functional characterization of  Arabidopsis CPR5  in the ABA signaling and LOX pathways. The  cpr5  mutant was hypersensitive to ABA in the seed germination, cotyledon greening and root growth, whereas transgenic plants overexpressing  CPR5  were insensitive. Genetic analysis demonstrated that  CPR5  gene may be located downstream of the  ABI1  in the ABA signaling pathway. However, the  cpr5  mutant showed an ABA independent drought-resistant phenotype. It was also found that the  cpr5  mutant was hypersensitive to NDGA and NDGA treatment aggravated the ABA-induced delay in the seed germination and cotyledon greening. Taken together, these results suggest that the  CPR5  plays a regulatory role in the regulation of seed germination and early seedling growth through ABA and LOX pathways independently.

Arabidopsis CPR5 Independently Regulates Seed Germination and Postgermination Arrest of Development through LOX Pathway and ABA Signaling