In contrast to belowground roots, relative growth rate did not strongly increase upon transition to the elongation zone, while elongating growth was often prolonged. Key Results: All the studied aerial roots had an open apical meristem, and mitoses were not restricted to the meristem. In 12 species, we studied the anatomical structure and distribution of cortex cell lengths and rhizoderm in the growth zone. Methods: Growth of aerial roots in 20 structurally dependent plant species from eight families was studied ex situ. Whether aerial roots of structurally dependent (=epiphytic/hemiepiphytic) species differ is virtually unexplored. This statement is based almost entirely on studies with soil-rooted plants. 4Functional Ecology Group, Institute of Biology and Environmental Sciences, University of Oldenburg, Oldenburg, Germanyīackground and Aims: In the roots of most vascular plants, the growth zone is small, the meristem and the elongation zone are sharply separated, and only meristematic cells divide.3Faculty of Biology, Saint Petersburg State University, Saint Petersburg, Russia.2Tzitzin Main Botanical Garden, Russian Academy of Sciences, Moscow, Russia. ![]()
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