Differences in the sensitivity to UVB radiation of two cultivars of rice (Oryza Sativa L.) based on observation of long-lived radicals

Jun Kumagai, Hiromi Katoh, Tetsuo Miyazaki, Jun Hidema, Tadashi Kumagai

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Free radicals with a long lifetime were observed in the leaves of two rice cultivars (Oryza sativa L.), Sasanishiki (UVB resistant) and Norin-1 (UVB sensitive), by electron spin resonance spectroscopy. The leaves of both cultivars grown with visible light show very similar ESR spectra composed of radical 1 (R1) and radical 2 (R2), which may be attributable to P700 cation radicals in the reaction center of photosystem I, and tyrosine cation radicals in the reaction center of photosystem II, respectively. The ESR spectrum composed of R1 and R2 radicals in the leaves of Sasanishiki grown under visible light with supplemental UVB was similar to that in the plant grown without supplemental UVB. On the other hand, the amount of R2 radicals in the leaves of Norin-1 grown under visible light with supplemental UVB was significantly smaller than that in the plant grown without supplemental UVB. It is suggested that the loss of R2 radicals in Norin-1 upon UVB irradiation is related to the instability of the plant.

Original languageEnglish
Pages (from-to)303-310
Number of pages8
JournalJournal of radiation research
Volume40
Issue number4
DOIs
Publication statusPublished - 1999 Dec

Keywords

  • Long-lived radical
  • Norin-1
  • Photosynthesis
  • Sasanishiki
  • UVB irradiation

ASJC Scopus subject areas

  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Health, Toxicology and Mutagenesis

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