Journal Article

Changes in Levels of Thylakoid Components in Chloroplasts of Pine Needles of Different Ages

Kenji Shinohara and Akio Murakami

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 37, issue 8, pages 1102-1107
Published in print December 1996 | ISSN: 0032-0781
e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029060
Changes in Levels of Thylakoid Components in Chloroplasts of Pine Needles of Different Ages

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  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Levels of thylakoid components in chloroplasts and transcripts of photosynthesis-related genes were compared in leaves of different ages, namely, current, 1-year-old and 2-year-old needles, of a Japanese black pine tree (Pinus thunbergii). Levels of thylakoid components, PSI, PSII and Cyt b6/f complexes, measured as P700, Cyt b559 and Cyt f, respectively, were lowest in current needles, on a per needle basis, and were almost eight times higher in 1-year-old needles. Levels of PSI and Cyt b6/f complexes were slightly lower in 2-year-old needles while the level of PSII remained unaltered or was even slightly higher than in 1-year-old needles. The ratio of PSI to PSII decreased markedly as needles aged. By contrast, levels of cab, psaA/B, psbA, rbcS and rbcL transcripts were the highest in current needles, and the levels decreased with increasing age. The extent of the reduction was the greatest for psaA/B transcripts, with the level in 2-year-old needles being about 30% of that in current needles. The smallest reduction was observed in the level of psbA transcripts with about 90% of the current-year level in 2-year-old needles. These results suggest that PSII complex accumulates more slowly than PSI complex during leaf development, and that PSI and Cyt b6/f complexes decay before PSII during the initial period of senescence.

Keywords: Japanese black pine (Pinus thunbergii); Levels of transcripts; Needles of different ages; Photosynthesis-related genes; Ratio of PSI to PSII; Thylakoid components

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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