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American Journal of Botany, Vol 84, 1042, Copyright © 1997 by Botanical Society of America, Inc.

STRUCTURE AND DEVELOPMENT

Quantitative determination of calcium oxalate and oxalate in developing seeds of soybean (Leguminosae)

H Ilarslan, RG Palmer, J Imsande and HT Horner

Developing soybean seeds accumulate very large amounts of both soluble oxalate and insoluble crystalline calcium (Ca) oxalate. Use of two methods of detection for the determination of total, soluble, and insoluble oxalate revealed that at +16 d postfertilization, the seeds were 24% dry mass of oxalate, and three-fourths of this oxalate (18%) was bound Ca oxalate. During later seed development, the dry mass of oxalate decreased. Crystals were isolated from the seeds, and X-ray diffraction and polarizing microscopy identified them as Ca oxalate monohydrate. These crystals were a mixture of kinked and straight prismatics. Even though certain plant tissues are known to contain significant amounts of oxalate and Ca oxalate during certain periods of growth, the accumulation of oxalate during soybean seed development was surprising and raises interesting questions regarding its function.


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Copyright © 1997 by the Botanical Society of America, Inc.