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Effects of Zinc Deficiency on the Multiplication and Expansion of Sugarbeet Leaf Cells¹

The effects of zinc deficiency on cell number, mean cell volume, and dry weight of sugarbeet (Beta vulgaris L.) leaves was determined using plants cultured hydroponically in growth chambers. Zinc deficiency reduced the number of cells in the first-formed leaf (leaf 1) 48 to 70% of the control and in the fourth-formed leaf (leaf 4) 39 to 43% of the control. Mean cell volume was not significantly changed by zinc deficiency in leaf 1 but was decreased 30 to 38% of the control in leaf 4. Leaf dry weight was decreased more by zinc deficiency in leaf 4 than hi leaf 1. The results showed that zinc deficiency, in its initial stages, retarded cell division and dry matter accumulation of leaves but had little effect on cell expansion. As zinc deficiency became more severe, cell expansion was also decreased.

Key Words: Beta vulgaris L. • "Little leaf."

² Graduate student and Assistant Professor of Environmental Plant Physiology, University of California, Berkeley, CA 94720.

Received for publication September 14, 1973.