Dissecting Maize Aerial Meristems

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Abstract
The plant kingdom displays a wide array of shapes, and this morphology is tightly linked to function and productivity. For example, leaf size, shape, and arrangement around the stem define canopy architecture, influencing light interception and photosynthetic capacity. Understanding how final morphology is determined is, therefore, not only important for our basic understanding of various plant species, but also an essential tool in the development of new crop varieties. All aerial organs in flowering plants arise on the flanks of meristems throughout development. In Zea mays (maize) , these meristems are deeply enclosed within successive leaf layers, making their identification and isolation technically challenging. Successful dissection requires accurate staging, recognition of anatomical landmarks, and careful tissue handling to avoid damage or desiccation. These challenges can present a significant barrier to researchers attempting maize developmental biology studies. Here, we provide a practical, step-by-step guide for identifying and dissecting vegetative shoot apical, tassel, and ear meristems. The protocol integrates external morphological cues, nodal position, stem texture, and diagnostic cross-sectional features to distinguish cuts made above, through, or below the meristem. Detailed strategies are described to sequentially remove enclosing leaf primordia, while preserving meristem integrity. By formalizing techniques often transmitted informally within laboratories, this protocol lowers the barrier to entry for maize meristem research, supporting downstream applications including imaging, gene expression analysis, and developmental phenotyping.

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