CKB1 is Involved in Abscisic Acid and Gibberellic Acid Signaling to Regulate Stress Responses in Arabidopsis Thaliana

Overview

Journal J Plant Res

Specialty Biology

Date 2017 Mar 26

PMID 28342111

Citations 4

Authors

Congying Yuan

Jianping Ai

Hongping Chang

Wenjun Xiao

Lu Liu

Cheng Zhang

Zhuang He

Ji Huang

Jinyan Li

Xinhong Guo

Affiliations

Soon will be listed here.

Abstract

Casein kinase II (CK2), an evolutionarily well-conserved Ser/Thr kinase, plays critical roles in all higher organisms including plants. CKB1 is a regulatory subunit beta of CK2. In this study, homozygous T-DNA mutants (ckb1-1 and ckb1-2) and over-expression plants (35S:CKB1-1, 35S:CKB1-2) of Arabidopsis thaliana were studied to understand the role of CKB1 in abiotic stress and gibberellic acid (GA) signaling. Histochemical staining showed that although CKB1 was expressed in all organs, it had a relatively higher expression in conducting tissues. The ckb1 mutants showed reduced sensitivity to abscisic acid (ABA) during seed germination and seedling growth. The increased stomatal aperture, leaf water loss and proline accumulation were observed in ckb1 mutants. In contrast, the ckb1 mutant had increased sensitivity to polyaluminum chloride during seed germination and hypocotyl elongation. We obtained opposite results in over-expression plants. The expression levels of a number of genes in the ABA and GA regulatory network had changed. This study demonstrates that CKB1 is an ABA signaling-related gene, which subsequently influences GA metabolism, and may play a positive role in ABA signaling.

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