Abstract
Cellular and tissue volumes were measured in caps of primary roots of Zea mays. There is an 850% increase in cellular volume as cellular function changes from that of being meristematic (i.e., calyptrogen cells) to graviperception (i.e., columella cells), and a 22% increase in cellular volume during the functional transition from graviperception to the production and secretion of mucilage. Cellular volume does not change significantly after cells cease mucilage production and are sloughed from the cap. Root caps of Z. mays allocate 7.5% of their volume for regeneration, 14.9% for graviperception, 24.3% for the transition of function from graviperception to mucilage production and secretion, and 38.7% for the production and secretion of mucilage. The remaining 14.5% of the cap volume is comprised of cells being sloughed from the cap.
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