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Stomatal regulation is important for water transpiration from plants. Stomatal opening and closing are controlled by many transporter proteins in guard cells. AtABCG22 is a member of the ATP-binding cassette (ABC) transporters and is a stomatal regulator; however, the function of AtABCG22 has not yet been determined fully, although a mutant phenotype included a significant effect on stomatal status. Here, we further investigated the function of the  AtABCG22  gene and its functional relationships with other subfamily genes. Among close family members, we found a functional relationship of stomatal phenotypes with  AtABCG21 , which is also expressed specifically in guard cells. Based on an analysis of double mutants, adding the  atabcg21  mutation to  atabcg22  mutant partially suppressed the open-stomata phenotype of  atabcg22 . Multiple-mutant analyses indicated that this suppression was independent of abscisic acid signaling in guard cells. We also found that  atabcg22  mutant showed a unique time course-dependent phenotype, being defective in maintenance of stomatal status after initial stomatal opening elicited by light signaling. The function of AtABCG22 and its relationship with AtABCG21 in stomatal regulation are considered.

Functional relationship of AtABCG21 and AtABCG22 in stomatal regulation