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Parenchyma Cell Death in Elongating Corn Cobs¹

The pattern of cell death in the parenchyma tissue of the central portion of the corn cob was followed during ear elongation using a pith condition rating system based on the amount of white tissue observed in the cob when it was cut through the longitudinal axis. The white tissue was composed of dead cells. Cell death began in the central region and cells died more rapidly along the longitudinal axis than did those closer to the outer cylinder of vascular tissue surrounding the central parenchyma tissue. Although the pattern for cell death was similar in ears of plants grown on low or high N levels, ears grew longer and cells died earlier in the high N level.

Key Words: Nitrogen fertilizer

² Assistant Professor, Department of Biology, Queensborough Community College, Bayside, New York 11364; Associate Professor, Department of Botany; Professor, Department of Chemistry; and Associate Professor, Department of Plant Industries, Southern Illinois University, Carbondale, Illinois 62901, respectively.

Received for publication November 14, 1970.