Journal
PLANT AND CELL PHYSIOLOGY
Volume 52, Issue 1, Pages 37-48Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcq129
Keywords
CLV3/ESR-related (CLE); cytokinin; signal transduction; protoxylem; Arabidopsis thaliana
Categories
Funding
- Ministry of Education, Science, Sports, and Culture of Japan, Japan [1906009]
- Japan Society for the Promotion of Science [20247003]
- Bio-oriented Technology Research Advancement Institution
- Grants-in-Aid for Scientific Research [19060016] Funding Source: KAKEN
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Cell-cell communication is critical for tissue and organ development. In plants, secretory CLAVATA3/EMBRYO SURROUNDING REGION-related (CLE) peptides function as intercellular signaling molecules in various aspects of tissue development including vascular development. However, little is known about intracellular signaling pathways functioning in vascular development downstream of the CLE ligands. We show that CLE peptides including CLE10, which is preferentially expressed in the root vascular system, inhibit protoxylem vessel formation in Arabidopsis roots. GeneChip analysis displayed that CLE10 peptides repressed specifically the expression of two type-A Arabidopsis Response Regulators (ARRs), ARR5 and ARR6, whose products act as negative regulators of cytokinin signaling. The arr5 arr6 roots exhibited defective protoxylem vessel formation. These results indicate that CLE10 inhibits protoxylem vessel formation by suppressing the expression of type-A ARR genes including ARR5 and ARR6. This was supported by the finding that CLE10 did not suppress protoxylem vessel formation in a background of arr10 arr12, a double mutant of type-B ARR genes. Thus, our results revealed cross-talk between CLE signaling and cytokinin signaling in protoxylem vessel formation in roots. Taken together with the indication that cytokinin signaling functions downstream of the CLV3/WUS signaling pathway in the shoot apical meristem, the cross-talk between CLE and cytokinin signaling pathways may be a common feature in plant development.
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