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Differences in Starch Accumulation among Dry Bean Cultivars¹

During ontogeny, most plants store some forms of carbohydrate reserve, which may or may not be used at later stages of development (e.g., fruit growth). Little has been reported on the amount of reserve carbohydrate based on genotypic differences. The purpose of this experiment was to assess levels and changes in levels of starch stored in root and stem tissue of a diverse set of dry bean (Phaseolus vulgaris L.) cultivars in relation to seed yields. Starch associated with cultivars and stages of development was monitored with an iodine-potassium iodide starch-indicator solution. Starch in roots and stems varied significantly among cultivars, the range extending from undetectable amounts to abundant starch. Similarly, starch varied significantly with stage of development, usually declining as seed-filling was completed. Significant stage x cultivar interactions occurred in both root and stem. No one pattern of change in starch was always associated with either high or low-yielding cultivars.

Key Words: Mobilization • Sink demand • Phaseolus vulgaris L.

² Professor of crop science, research associate, and former graduate student, respectively. Crop and Soil Sciences, Michigan State Univ., E. Lansing, MI 48824.

Received for publication April 13, 1977.