期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 16, 页码 6337-6342出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1117537109
关键词
peptide signal; pedicel elongation; cell-cell communication
资金
- National Science Foundation [IOS-0744892]
- Japan Science and Technology Agency
- Japanese Ministry of Education, Culture, Sports, Science, and Technology [22370019, 19060007, 22657015, 20770035, 22770038]
- Sumitomo Foundation
- Grants-in-Aid for Scientific Research [22657015, 22370019, 24570050, 22770038, 19060007, 20770035, 19060005] Funding Source: KAKEN
Multicellular organisms achieve final body shape and size by coordinating cell proliferation, expansion, and differentiation. Loss of function in the Arabidopsis ERECTA (ER) receptor-kinase gene confers characteristic compact inflorescence architecture, but its underlying signaling pathways remain unknown. Here we report that the expression of ER in the phloem is sufficient to rescue compact er inflorescences. We further identified two EPIDERMAL PATTERNING FACTOR-LIKE (EPFL) secreted peptide genes, EPFL4 and EPFL6/CHALLAH (CHAL), as redundant, upstream components of ER-mediated inflorescence growth. The expression of EPFL4 or EPFL6 in the endodermis, a layer adjacent to phloem, is sufficient to rescue the er-like inflorescence of epfl4 epfl6 plants. EPFL4 and EPFL6 physically associate with ER in planta. Finally, transcriptome analysis of er and epfl4 epfl6 revealed a potential downstream component as well as a role for plant hormones in EPFL4/6- and ER-mediated inflorescence growth. Our results suggest that inter-cell layer communication between the endodermis and phloem mediated by peptide ligands and a receptor kinase coordinates proper inflorescence architecture in Arabidopsis.
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