Isoprene emissions and pigment content in Sphagnum from peatlands in relation to N deposition – Whim bog

Background

  • Isoprene and pigments are C-based natural compounds that play different roles in plants (e.g., thermotolerance, antioxidants, photoprotection, etc.)
  • 90% of isoprene emissions are from terrestrial plants
  • Isoprene are non-essential isoprenoid, while carotenoids are essential isoprenoids. Their metabolic routes share several steps: Opportunistic hypothesis
  • Isoprene plays an important role in atmospheric chemistry, and thus climate, and in the C cycle
  • Peatlands store ~1/3 of the total soil C as organic matter and global change can compromise their role as C sinks
  • The relationship between N deposition and isoprene emissions in Sphagnum-dominated peatbogs remains unknown

Questions

  • Is isoprene emission in S. capillifolium affected by N deposition?
  • Is pigment content (including carotenoids) in S. capillifolium affected by increased N deposition?
  • Is there any difference in the response (in terms of isoprene emission and pigment content) of green and red pigmented S. capillifolium to N deposition ?
  • Is there any relationship between carotenoid content and isoprene emission, as predicted by the opportunistic hypothesis?
  • Is the relative investment in isoprene and carotenoids affected by increased N deposition?

Study site

  • Whim Bog (Scotland Borders, UK, 3°16’W, 55°46’N, 280 m asl): transition between upland blanket bog and lowland raised bog. Sphagnum and Eriophorum are the main peatforming species

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