Imperforate tracheary element classification for studies of xylem structure-function relations

Summary Discovering how xylem function emerges from structure requires approaches that are distinct those invented for wood identification. I exemplify this need different by discussing the classification of imperforate tracheary elements, cells go names such as “fibers,” tracheids, fiber-tracheids, and libriform fibers. Currently, there two systems, one identification championed Sherwin Carlquist research on function. emphasize neither is globally “correct” all applications, but instead each appropriate aims its field. Wood uses an easily-applied designed to remain stable over long term. This stability allows anatomists build large databases data maximally useful In contrast, functional biologists flexible definitions serve hypotheses element be tested, modified, tested again, in open-ended process refining knowledge structure-function relations. highlight some many open questions points to, morphological correlates conductive/nonconductive distinction, features associated with vessel grouping, whether fiber-fiber tracheid distinction arbitrary or not, other topics. Recognizing purpose a drive shifts focus away debates about given cell type onto empirical priorities study. While solid tradition within comparative anatomy training identification, train anatomists, who can guide interact physiologists more robust explanations