Journal
DEVELOPMENT
Volume 143, Issue 7, Pages 1120-1125Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/dev.130021
Keywords
Endoreduplication; Ploidy; Cell volume; Mesophyll tissue; Epidermis; ATML1
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Funding
- CREST grants from the Japan Science and Technology Agency
- Ministry of Education, Culture, Sports, Science and Technology (MEXT/JSPS KAKENHI)
- JSPS
- Grants-in-Aid for Scientific Research [26291067, 25113002, 15J07264, 15H05962] Funding Source: KAKEN
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Growth and developmental processes are occasionally accompanied by multiple rounds of DNA replication, known as endoreduplication. Coordination between endoreduplication and cell size regulation often plays a crucial role in proper organogenesis and cell differentiation. Here, we report that the level of correlation between ploidy and cell volume is different in the outer and inner cell layers of leaves of Arabidopsis thaliana using a novel imaging technique. Although there is a well-known, strong correlation between ploidy and cell volume in pavement cells of the epidermis, this correlation was extremely weak in palisade mesophyll cells. Induction of epidermis cell identity based on the expression of the homeobox gene ATML1 in mesophyll cells enhanced the level of correlation between ploidy and cell volume to near that of wild-type epidermal cells. We therefore propose that the correlation between ploidy and cell volume is regulated by cell identity.
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