Mechanisms and flexibility in plant asymmetric cell division

Asymmetric cell division (ACD) is a central mechanism that generates cellular diversity and tissue patterning in plants. Because they are constrained by rigid cell walls, plant cells often employ precisely oriented divisions to generate distinct daughter-cell fates. While classic studies have identified where ACD occurs and genetic studies have uncovered key regulators, the mechanisms linking early asymmetries to fate specification remain incompletely understood. Here, we synthesize insights from diverse plants and algae about symmetry-breaking in their zygotes and specialized cell lineages. We then discuss how initial asymmetries are translated into stable daughter-cell identities and how cells integrate positional information, lineage, and signaling networks to decide between self-renewal and differentiation. We also highlight emerging tools that could be applied to resolve current blind spots in symmetry breaking, asymmetric inheritance, and fate specification. Together, these perspectives reveal how plants repeatedly reinvent asymmetry to pattern tissues reproducibly yet flexibly, providing a framework to probe the mechanisms and evolution of plant ACD.