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Growth and Water Movement in Silver Maple Seedlings Affected by Cadmium¹

ABSTRACT

Effect of cadmium chloride on dry weight accumulation, height growth, and relative conductivity of stems of silver maple (Acer saccharinum L.) seedlings exposed to 0, 5, 10, or 20 ppm CdCl₂ · 2 H₂O (on weight basis of rooting media) was determined. Leaf, stem, and root dry weight were significantly reduced by all CdCl₂ treatments. Seedling height at 8 weeks was severely reduced and strongly correlated with applied CdCl₂ levels. Relative conductivity of excised stem sections was significantly reduced by Cd treatment. The reduction was caused by (i) a progressive decrease in the proportion of xylem tissue available for water conduction, (ii) reduced size of vessels and tracheids, and (iii) partial blockage of xylem elements by cellular debris or gums. These findings are discussed in relation to water stress.

Key Words: relative conductivity • Acer saccharinum

¹ This work was supported by a grant (GI-35106) from the National Science Foundation (RANN) and the Purdue Agric. Exp. Stn., Purdue Univ., West Lafayette, IN 47907. J. Pap. No. 6549.

² Graduate Research Assistant and David Ross Fellow, and Associate Professor of Physiological Ecology, Dep. of Forestry and Natural Resour., Purdue Univ., respectively.

Received for publication August 17, 1976.