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-I gene are both required in early maturation phase for germination suppression and the accumulation of storage globulins encoded by the gene Gibl. (27).In the present report, we focus on two major embryo storage proteins encoded by the single gene Glbl (formerly, Pro or Prot, 15), looking at the effects of ABA and germination suppression on the synthesis and accumulation of these maturation phase markers. The Glbl primary translation product, preGLB 1, (molecular mass 60-65 kD) is sequentially modified and processed to produce GLBI' (65-70 kD) and its derivative, GLB1 (60-65 kD), which accumulate in storage bodies during embryo development (15, 16). MATERIALS AND METHODSAbscisic acid plays a dual role in plant embryo development. Experiments using isolated embryos (or embryonic organs) of cotton, soybean, rapeseed, and wheat show that the application of exogenous ABA increases or maintains the expression of specific proteins characteristic of embryo maturation while it suppresses precocious germination (2,3,5,7,8,10,13,24
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