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Relation of Coleoptile Structure to Coleoptile Strength and Seedling Emergence Under Compacted Soil Conditions in Six Varieties of Winter Wheat¹

Coleoptile length under soil compaction as a percent of length under no compaction was used to measure coleoptile strength. Varieties that produced long coleoptiles under no compaction produced the longest coleoptiles under compaction. Correlations were found between cell diameter and several morphologic structures of the coleoptile. As soil compaction increased, coleoptile length was reduced; total plants emerged and rate of emergence also decreased.

Key Words: coleoptile morphology • anatomical • paraffin tissue preparation • coleoptile sheath • parenchyma cell • F.A.A. • E.R.I. index • soil pressure • soil compaction selection technique

² Professor of Plant Breeding; formerly Research Assistant, Plant Science Division, University of Wyoming (now Assistant Professor of Agronomy, Washington State University, Pullman); Assistant Professor of Botany; and Research Assistant.

Received for publication January 18, 1967.

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