A stromule is a microscopic structure found in plant cells. Stromules (stroma-filled tubules) are highly dynamic structures extending from the surface of all plastid types, including proplastids, chloroplasts, etioplasts, leucoplasts, amyloplasts, and chromoplasts.â€ś
Source : Wikipedia
They are ubiquitous, being found extending from the surface of plastids in all multicellular plants - however :
â€ť[â€¦] their function is still largely a matter of conjecture. They may increase the plastid surface area to facilitate movement of materials into or out of plastids, be involved in sensing the cellular environment, and/or have signaling functions due to close apposition of stromules and nuclei, plasma membrane and other cell organelles. Stromule formation appears unrelated to chloroplast division or to light-intensity-dependent chloroplast movement.â€ś
Source : Plastid Development in Leaves during Growth and Senescence pp 169-186
Currently, there are at least ten hypotheses regarding their possible functions, and several more suggesting how they might form. See : Plant Physiology,Volume 176, Issue 1, January 2018, Pages 128â€“137
Also see :
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