Organic hydrogen-carbon isotope signatures of terrestrial higher plants during biosynthesis for distinctive photosynthetic pathways

Y. Chikaraishi, H. Naraoka

研究成果: Contribution to journalArticle査読

25 被引用数 (Scopus)

抄録

Stable isotopic compositions of organic hydrogen (δD) have positive correlations (r2 > 0.95) with those of carbon (δ13C) among several compound fractions of terrestrial plant leaves possessing distinctive photosynthetic pathways (C3, C4 and CAM). The δD/δ13C slopes of C3 plants vary from ∼25 to 42, which are larger than those of C4 plants (11 to 12). CAM plants have intermediate δD/δ13C slopes (∼17 to 20) between C3 and C4 plants. Using a δD-δ13C diagram, photosynthetic metabolisms are clearly discriminated, even though they sometimes cannot be distinguished from each other only by carbon isotopes. Relative to bulk organic matter, hydrogen and carbon of lipid fraction are more depleted in 13C than those of pigment fraction, respectively. Furthermore, δD values of lipid and pigment fractions relative to bulk organic hydrogen have negative correlations with δ13C values of corresponding fractions among the three photosynthetic pathways. This isotopic covariance among each fraction may be attributable to kinetically-controlled molecular biosyntheses using similar enzymes but with different isotope fractionations. Or the intermediate molecules for the biosyntheses have isotopically different pools in hydrogen and carbon.

本文言語英語
ページ(範囲)451-458
ページ数8
ジャーナルGEOCHEMICAL JOURNAL
35
6
DOI
出版ステータス出版済み - 2001
外部発表はい

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 地球化学および岩石学

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