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Differential Starch Accumulation in the Leaf Mesophyll Layers of Soybean¹

This study was undertaken to examine a common assumption that starch is uniformly distributed in soybean [Glycine max( L.) Merr.] leaves. Observations from leaf samples collected during 4 years, including at least 12 cultivars and a shading experiment, showed this assumption to be false. In fact, a consistent hierarchy was found in the distribution of starch. Starch was first deposited in the abaxial palisade layer, followed by the spongy mesophyll, and then each of the remaining palisade layers in sequence. Unloading occurred in the reverse order in a shading experiment. Seldom was starch observed in the paraveinal mesophyll layer.

Key Words: Starch remobilization • Leaf anatomy • Photosynthesis • Glycine max (L.) Merr

² Current Addresses: Dep. of Business Administration, Univ. of Calif., Berkeley, CA 94720; Section of Plant Biology, Plant Science Bldg., Cornell University, Ithaca, NY 14853; and Agronomy Physiology Lab., Agronomy Dep., University of Florida, Gainesville, FL 32611.

Received for publication February 22, 1982.