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Background  The plant hormone abscisic acid (ABA) regulates diverse processes of plant growth and development. It has recently been proposed that GCR2 functions as a G-protein-coupled receptor (GPCR) for ABA. However, the structural relationships and functionality of GCR2 have been challenged by several independent studies. A central question in this controversy is whether  gcr2  mutants are insensitive to ABA, because  gcr2  mutants were shown to display reduced sensitivity to ABA under one experimental condition (e.g. 22°C, continuous white light with 150 µmol m -2  s −1 ) but were shown to display wild-type sensitivity under another slightly different condition (e.g. 23°C, 14/10 hr photoperiod with 120 µmol m −2  s −1 ). It has been hypothesized that  gcr2  appears only weakly insensitive to ABA because two other  GCR2 -like genes in Arabidopsis,  GCL1  and  GCL2 , compensate for the loss of function of  GCR2 .    Principal Findings  In order to test this hypothesis, we isolated a putative loss-of-function allele of  GCL2 , and then generated all possible combinations of mutations in each member of the  GCR2  gene family. We found that all double mutants, including  gcr2 gcl1 ,  gcr2 gcl2 ,  gcl1 gcl2 , as well as the  gcr2 gcl1 gcl2  triple mutant displayed wild-type sensitivity to ABA in seed germination and early seedling development assays, demonstrating that the  GCR2  gene family is not required for ABA responses in these processes.    Conclusion  These results provide compelling genetic evidence that GCR2 is unlikely to act as a receptor for ABA in the context of either seed germination or early seedling development.

The GCR2 Gene Family Is Not Required for ABA Control of Seed Germination and Early Seedling Development in Arabidopsis