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. 1980 Jan;65(1):81–84. doi: 10.1104/pp.65.1.81

Enzymic Mechanism of Starch Breakdown in Germinating Rice Seeds

9. DE NOVO SYNTHESIS OF β-AMYLASE

Kazuo Okamoto 1, Takashi Akazawa 1
PMCID: PMC440271  PMID: 16661149

Abstract

Germinating rice seeds were fed with [35S]methionine and the incorporation of 35S into β-amylase demonstrated by quantitative immunoprecipitation using rabbit anti-β-amylase immunoglobulin G fraction. Separation of the antigen-antibody complex by Na-dodecylsulfate gel electrophoresis and subsequent radioautography clearly showed the radioactive labeling of the β-amylase molecule. The specific radioactivity of β-amylase derived from scutellum by immunoprecipitation was significantly greater than that of the endosperm. The results strongly indicate that at the onset of germination of rice seeds β-amylase is synthesized de novo in the scutellum and that in later stages there occurs activation of an inactive, latent form of the enzyme associated with starch granules in the endosperm. In later stages of germination this activated form of the enzyme becomes dominant.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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