||The coordination of ploidy and cell size differs between cell layers in leaves.
Development (Cambridge, England)
||Katagiri Yohei Y,Hasegawa Junko J,Fujikura Ushio U,Hoshino Rina R,Matsunaga Sachihiro S,Tsukaya Hirokazu H
||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 ofArabidopsis thalianausing 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 geneATML1in 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.