Fig. 4. Vascular pattern development in the first leaf of wild type (A-D) and fkd1 (E-H). Formation of the midvein (mv) and distal secondary veins (ds) in wild type (A,B) is indistinguishable from fkd1 (E,F). Subsequent secondary veins (s) initiate from existing vascular tissue in wild type (C) but initiate freely in fkd1 (G), leading to the development of vascular islands (vi) in the immature leaf. Tertiary veins (t) fill in the developing vascular pattern (D,H). Arrows indicate basal free vein ends. Scale bar: 250 µm.

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