UVB-induced cyclobutyl pyrimidine dimer and photorepair with progress of growth and leaf age in rice

Jun Hidema, Tadashi Kumagai

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


We have examined the susceptibility to cyclobutyl pyrimidine dimer (CPD) induction by UVB radiation, the ability to photorepair cyclobutyl pyrimidine dimers (CPDs), and the levels of ultraviolet (UV)-absorbing compounds in various developing stages of leaves in UVB-resistant (Sasanishiki) and -sensitive (Norin 1) rices (Oryza sativa L.). UVB produces more CPDs in the second, third and fourth fully expanded leaves than in the fifth and sixth fully expanded leaves. In leaves in which the levels of UV-absorbing compounds are lower, more CPDs are produced. The ability to photorepair CPDs in fully expanded leaves of different stages of each cultivar remains approximately constant, although the photorepair capacity in the fourth leaf rapidly increases from leaf emergence until full expansion. The photorepair capacity is lower in Norin 1 than that in Sasanishiki in all the leaf stages or different aged leaves. These results therefore suggest that lice plants could be more susceptible to CPD induction at the stage when the second, third or fourth leaves are developing, and UVB sensitivity correlates with low CPD photorepair.

Original languageEnglish
Pages (from-to)121-127
Number of pages7
JournalJournal of Photochemistry and Photobiology B: Biology
Issue number2
Publication statusPublished - 1998 May 15


  • Cyclobutyl pyrimidine dimer(s)
  • Leaf stage and age
  • Photorepair
  • Rice
  • UV-absorbing compounds
  • UVB radiation

ASJC Scopus subject areas

  • Radiation
  • Radiological and Ultrasound Technology
  • Biophysics
  • Radiology Nuclear Medicine and imaging


Dive into the research topics of 'UVB-induced cyclobutyl pyrimidine dimer and photorepair with progress of growth and leaf age in rice'. Together they form a unique fingerprint.

Cite this