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Compartmentation and fluxes of carbon in leaf blades and leaf sheaths of Poa annua L. and Poa x jemtlandica (Almq.) Richt
Author(s) -
BORLAND A. M.,
FARRAR J. F.
Publication year - 1988
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1988.tb01792.x
Subject(s) - poa annua , carbon fibers , botany , carbon cycle , fructan , biology , carbon dioxide , flux (metallurgy) , chemistry , poaceae , ecology , ecosystem , materials science , fructose , composite number , composite material , biochemistry , organic chemistry
The allocation of photosynthetically fixed carbon in the leaf blades and sheaths of Poa annua (a ruderal grass) and Poa x jemtlandica (a sub‐arctic grass) was followed over a light‐dark cycle. Labelling with 14 Carbon and gas exchange measurements provide data for an eight‐compartment model describing the partitioning of carbon between spatially and chemically separated pools and their rates of turnover. Soluble sugars and fructans were turned over rapidly in the leaf blades of both species. The flux of carbon through pools of storage carbohydrates was higher in the leaves of P. x jemtlandica than in P. annua. The exchange of carbon between pools was slower in the sheath than the blade. Carbohydrates stored in the sheath appeared to have no significant role in metabolism over the light‐dark cycle studied here.