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Fig. 2. (A) Longitudinal section stained with Safranin, Fast Green, and Orange G, of a 5-wk-old oat plant grown at 13°C under controlled conditions; this was a nonhardened plant corresponding to the plant "A" in Fig. 1. (B) Longitudinal section of an oat plant grown for 5 wk at 13°C and then 3 wk at 3°C to induce cold-hardening; this section corresponds to the plant "B" in Fig. 1 and is the control tissue to which all other sections were compared. (C) Part of the crown core showing parenchyma, tracheids, metaxylem, and fibers. (D) Part of the crown core showing a longitudinally sectioned vessel bundle. Note longitudinal metaxylem vessels adjacent to those in cross section. The unlabeled bar in each subpanel is 100 µm.
