OsMADS6-OsMADS32 and REP1 control palea cellular heterogeneity and morphogenesis in rice

We report that the transcription factor (TF) REP1 promotes epidermal cell proliferation and differentiation in the BOP, resulting in hard silicified protrusion cells, by regulating the cyclin-dependent kinase gene, OsCDKB1;1. Conversely, TFs OsMADS6 and OsMADS32 are expressed exclusively in the MRP, where they limit cell division rates by inhibiting OsCDKB2;1 expression and promote endoreduplication, yielding elongated epidermal cells. Furthermore, reciprocal inhibition between the OsMADS6-OsMADS32 complex and REP1 fine-tunes the balance between cell division and differentiation during palea morphogenesis. We further show the functional conservation of these organ identity genes in heterogeneous cell growth in Arabidopsis, emphasizing a critical framework for controlling cellular heterogeneity in organ morphogenesis.PMID:38593802 | DOI:10.1016/j.devcel.2024.03.026

Source: Developmental Cell - April 9, 2024 Category: Cytology Authors: Xuelian Zhang Qiang Cai Ling Li Li Wang Yun Hu Xiaofei Chen Dabing Zhang Staffan Persson Zheng Yuan Source Type: research