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Figure 1. Morphology of 100-µm cross-sections taken from immature, elongating (a, c, and e) and mature, post-elongation (b, d, and f) stem internodes of alfalfa and Medicago truncatula. Thin sections were viewed by light microscopy. Panels a and b are from alfalfa clone 718, panels c and d are from M. truncatula inbred line A17, and panels e and f are from M. truncatula inbred line DZA315.16. epi, epidermis; col, collenchyma; chl, chlorenchyma; pf, phloem fibers; pi, pith; xf, xylem fibers; xv, xylem vessels. Bars represent 100 µm.
