Bridges Meristem and Organ Primordia Boundaries through , , and during Flower Development in

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The shoot apical meristem is the stem cell pool in plants that gives rise to all above-ground organs including leaves, flowers and fruits. Between the meristem and the newly formed organ primordia, a boundary with specialized cells is formed to separate them. Boundary genes are specifically expressed in boundaries and function in boundary formation and maintenance. Previous studies showed that boundary genes interact with meristem regulators and primordia genes during embryogenesis or leaf development. But whether and how boundaries communicate with meristem and organ primordia during flower development remains largely unknown. Here we combined genetic, molecular and biochemical tools to explore interactions between the boundary gene HANABA TARANU (HAN) and two meristem regulators BREVIPEDICELLUS (BP) and PINHEAD (PNH), and three primordia-specific genes PETAL LOSS (PTL), JAGGED (JAG) and BLADE-ON-PETIOLE (BOP) during flower development. We showed that boundary-expressing HAN communicates with the meristem through PNH, regulates floral organ development via JAG and BOP2, and maintains boundary morphology through CYTOKININ OXIDASE 3 (CKX3)-mediated cytokinin homeostasis. Thus, our findings shed light on the “bridge” role of boundaries between meristem and organ primordia during flower development in Arabidopsis.

Vyšlo v časopise: Bridges Meristem and Organ Primordia Boundaries through , , and during Flower Development in. PLoS Genet 11(9): e32767. doi:10.1371/journal.pgen.1005479
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1005479

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