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Planta

, 251:29 | Cite as

Biochemical analysis of a new sugary-type rice mutant, Hemisugary1, carrying a novel allele of the sugary-1 gene

  • Sumire Takahashi
  • Yu Kumagai
  • Hidenari Igarashi
  • Karin Horimai
  • Hiroyuki Ito
  • Toru Shimada
  • Yoji Kato
  • Shigeki HamadaEmail author
Original Article
  • 6 Downloads

Abstract

Main conclusion

A novel allele of the sugary-1 rice mutant was isolated. The single amino acid change led to isoamylase activity reduction and accumulation of high-molecular-weight phytoglycogen in seeds.

Abstract

A new sugary rice variety with an improved seed appearance has been isolated and designated Hemisugary1. This mutant, which was derived from Japonica-type cultivar Tsugaruroman treated with sodium azide, has about half the isoamylase activity of seeds in the original Tsugaruroman. The mutant also accumulates significant phytoglycogen, albeit approximately 40% of the total phytoglycogen in the existing sugary cultivar Ayunohikari which is defective in its most isoamylase activity. The site of mutation was identified using a re-sequence of the whole genome and a cleaved amplified polymorphic sequence (CAPS) marker. The hemisugary phenotypes of the F2 progeny were entirely consistent with the results of genotyping using the CAPS marker. Segregation analysis of the F2 population showed that the hemisugary phenotype was controlled by a single recessive gene, which was produced by a G → A single nucleotide polymorphism in the sugary-1 gene, resulting in a missense mutation from glycine to aspartic acid at amino acid position 333. Zymogram showed that this amino acid replacement resulted in a decrease in isoamylase activity with a concomitant reduction in the formation of isoamylase complexes. Phytoglycogen molecules from Hemisugary1 seeds were 3.5 times larger and contained more short glucan chains than did Ayunohikari seeds. Our data provide new insights into the relationship between isoamylase structure and phytoglycogen formation.

Keywords

Oryza sativa Isoamylase Sugary-1 Phytoglycogen Mutant 

Abbreviations

CAPS

Cleaved amplified polymorphic sequence

DBE

Starch debranching enzyme

ISA

Isoamylase

PUL

Pullulanase

Notes

Acknowledgements

This work was supported by a grant from Takano Life Science Research Foundation, Hirosaki University Grant for Exploratory Research by Young Scientists, and the Japanese Society for the Promotion of Science [KAKENHI, Grant Number 19K05989 (to SH)]. The work was carried out in part at the Teaching and Research Center for Bio-coexistence and Gene Research Center of Hirosaki University. We would like to thank Enago (www.enago.jp) for the English language review.

Supplementary material

425_2019_3321_MOESM1_ESM.docx (11 kb)
Supplementary material 1 (DOCX 10 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Sumire Takahashi
    • 1
  • Yu Kumagai
    • 1
  • Hidenari Igarashi
    • 1
  • Karin Horimai
    • 1
  • Hiroyuki Ito
    • 2
  • Toru Shimada
    • 3
  • Yoji Kato
    • 3
  • Shigeki Hamada
    • 1
    Email author
  1. 1.Faculty of Agriculture and Life ScienceHirosaki UniversityHirosakiJapan
  2. 2.Department of Chemical and Biological EngineeringNational Institute of Technology, Akita CollegeAkitaJapan
  3. 3.Faculty of EducationHirosaki UniversityHirosakiJapan

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