Differentiation During Normal Development in Shoots

2 Differentiation During Normal Development in Shoots 4.2.2.1 Xylem 

Wangermann (1967) excised Coleus leaves and found that fewer tracheary cells differentiated in the trace to the excised leaf, thus confirming, but with convincing quantitative data, the much earlier report of JosT (1893) on Phaseo-lus. The entire effect of the leaf on normal tracheary differentiation she found 

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