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Spring Small Grain Anatomical Response to Top Growth Clipping¹

Synopsis: Stems of top growth clipped field plants of 1 wheat, 3 oats, and 3 barley varieties had vascular bundles more closely arranged and smaller in diameter than those of undipped plants. High temperature (78 F.) reduced stele diameters, number of xylem strands and number of metaxylem vessels. No single causal factor for lodging was isolated although several associations were observed.

² Formerly graduate student in Agronomy, University of Wisconsin, now Deputy Director of Central Sugarcane Research Station, Bihar, India; Professor of Agronomy; and Associate Professor of Botany.

Received for publication November 18, 1955.