Bundle Sheath Leakiness and Light Limitation during C4 Leaf and Canopy CO2 Uptake 1[W][OA]
نویسندگان
چکیده
Physiological Ecology Group, Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom (J.K., H.G.); Biobased Products, Agrotechnology and Food Science Group, Wageningen University and Research Center, 6708 PD Wageningen, The Netherlands (H.E.S.); Botany Department, School of Natural Sciences, Trinity College Dublin, Dublin 2, Ireland (F.A., N.F., F.C., M.B.J.); Teagasc, Oak Park Crops Research Centre, Carlow, Ireland (J.F.); and Teagasc, Johnstown Castle Environmental Research Centre, Wexford, Ireland (G.J.L.)
منابع مشابه
Bundle sheath leakiness and light limitation during C4 leaf and canopy CO2 uptake.
Perennial species with the C(4) pathway hold promise for biomass-based energy sources. We have explored the extent that CO(2) uptake of such species may be limited by light in a temperate climate. One energetic cost of the C(4) pathway is the leakiness () of bundle sheath tissues, whereby a variable proportion of the CO(2), concentrated in bundle sheath cells, retrodiffuses back to the mesophyl...
متن کاملAcclimation of C4 metabolism to low light in mature maize leaves could limit energetic losses during progressive shading in a crop canopy
C4 plants have a biochemical carbon-concentrating mechanism that increases CO2 concentration around Rubisco in the bundle sheath. Under low light, the activity of the carbon-concentrating mechanism generally decreases, associated with an increase in leakiness (ϕ), the ratio of CO2 retrodiffusing from the bundle sheath relative to C4 carboxylation. This increase in ϕ had been theoretically assoc...
متن کاملAntisense Reduction of NADP-Malic Enzyme in Flaveria bidentis Reduces Flow of CO2 through the C4 Cycle [W][OA]
An antisense construct targeting the C4 isoform of NADP-malic enzyme (ME), the primary enzyme decarboxylating malate in bundle sheath cells to supply CO2 to Rubisco, was used to transform the dicot Flaveria bidentis. Transgenic plants (a-NADP-ME) exhibited a 34% to 75% reduction in NADP-ME activity relative to the wild type with no visible growth phenotype. We characterized the effect of reduci...
متن کاملLoss of photosynthetic efficiency in the shade. An Achilles heel for the dense modern stands of our most productive C4 crops?
The wild progenitors of major C4 crops grew as individuals subjected to little shading. Today they are grown in dense stands where most leaves are shaded. Do they maintain photosynthetic efficiency in these low light conditions produced by modern cultivation? The apparent maximum quantum yield of CO2 assimilation (ΦCO2max,app), a key determinant of light-limited photosynthesis, has not been sys...
متن کاملInfluence of clouds and diffuse radiation on ecosystem-atmosphere CO2 and CO O exchanges
[1] This study evaluates the potential impact of clouds on ecosystem CO2 and CO2 isotope fluxes (‘‘isofluxes’’) in two contrasting ecosystems (a broadleaf deciduous forest and a C4 grassland) in a region for which cloud cover, meteorological, and isotope data are available for driving the isotope-enabled land surface model (ISOLSM). Our model results indicate a large impact of clouds on ecosyst...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008