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Transient ethylene treatment alters subsequent guard cell orientation. A, In normal air control (7-d seedlings), the division plane between guard cells is predominantly longitudinal and never transverse to the long axis of the hypocotyl (n = 91). B, After a 2-d ethylene treatment at 10 μL L−1 on day 3 followed by 2 d in normal air, guard cell orientation is highly variable (n = 154).
