Cover illustration: The red dye in this fresh cross-section shows the path water takes as it moves upward after leaving the elongating region of a growing maize leaf. Water moves through a vascular transition from the protoxylem in the elongating region (single large vessel at top) to newly differentiating metaxylem above the elongating region (two large vessels at the side) through newly differentiating tracheids (small vessels between the large ones). The impact of this differentiation on growth-induced water potentials is described by Tang and Boyer (pp. 489-503).
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