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Molecular Biology and Gene Regulation

Developmental Regulation of -Conglycinin in Soybean Axes and Cotyledons ¹

Plant Biology Program, Department of Biology, Washington University, St. Louis, Missouri 63130

Analysis of the expression of genes encoding the -conglycinin seed storage proteins in soybean has been used to extend our understanding of developmental gene expression in plants. The , ', and subunits of -conglycinin are encoded by a multigene family which is organ-specific in its expression. In this study we report the differentially programmed accumulation of the , ', and subunits of -conglycinin. Multiple isomeric forms of each subunit are present in the dry seed, but the timing of their accumulation is unique for each subunit. The previously reported variation in amount of ' and subunits in axis and cotyledons is also reflected in the amount of subunit specific mRNA which is present in each tissue. The subunit, previously undetected in soybean axes, is found to be synthesized but rapidly degraded. These differences in -conglycinin protein accumulation may be reflected by the morphological differences observed in protein bodies between these two tissues.

³ Present address: Department of Botany and Microbiology, Oklahoma State University, Stillwater, OK 74078.

¹ This work was supported by grants from the National Science Foundation (PCM-8203122) and Department of Energy (DE-AC02-81ER1088) to R. N. B. B. F. L. was supported by a fellowship from the National Institutes of Health (NIH-NRSA).

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