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Development and Growth Regulation

Abscisic Acid and the Developmental Regulation of Embryo Storage Proteins in Maize ¹

Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331

The relationship of abscisic acid (ABA) inhibition of precocious germination and ABA-induced storage protein accumulation was examined over the course of embryogenesis in wild-type and viviparous mutants of maize (Zea mays L.). We show that a high level of embryo ABA and the product of the Viviparous-1 gene are both required in early maturation phase for germination suppression and the accumulation of storage globulins encoded by the gene Glb1. Suppressing precocious germination with a high osmoticum is not sufficient to initiate Glb1 protein synthesis, although continued accumulation is contingent upon this inhibition; germination of immature or mature embryos leads to a decline in synthesis and the degradation of stored globulins. Late in embryogenesis, fragments of Glb1 protein accumulate, coinciding with the loss of ABA sensitivity. These results suggest that ABA influences storage globulin accumulation by initiating synthesis, suppressing degradation, and inhibiting precocious germination.

¹ Supported by U.S. Department of Agriculture Competitive Grant 85-CRCR-1-1644 to C. J. R. Initial funding from the Oregon Agricultural Research Foundation. Oregon Agricultural Experiment Station Technical Paper 9420.

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