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- W2023518220 abstract "A, assimilation ratea, fractionation against 13C for CO2 diffusion through airb, net fractionation against 13C during CO2 fixationCa, ambient CO2 concentrationCc, CO2 concentration at the chloroplastCi, intercellular CO2 concentrationD, vapour pressure deficitEn, needle transpiration rateEp, whole plant water usegw, leaf internal transfer conductance to CO2gs, stomatal conductance to water vapourL, projected leaf areaNUE, nitrogen use efficiencyPEP, phosphoenolpyruvateRubisco, ribulose-1,5-biphosphate carboxylaseTDR, time domain reflectometryWUE, water use efficiencyΔ, carbon isotope discriminationδ13C, carbon isotope abundance parameterδ13Ca, carbon isotopic composition of atmospheric CO2θ, volumetric soil water contentThe effect of nitrogen stress on needle δ13C, water-use efficiency (WUE) and biomass production in irrigated and dry land white spruce (Picea glauca (Moench) Voss) seedlings was investigated. Sixteen hundred seedlings, representing 10 controlled crosses, were planted in the field in individual buried sand-filled cylinders. Two nitrogen treatments were imposed, nitrogen stressed and fertilized. The ranking of δ13C of the crosses was maintained across all combinations of water and nitrogen treatments and there was not a significant genetic versus environmental interaction. The positive relationships between needle δ13C, WUE and dry matter production demonstrate that it should be possible to use δ13C as a surrogate for WUE, and to select for increased WUE without compromising yield, even in nitrogen deficient environments. Nitrogen stressed seedlings had the lowest needle δ13C in both irrigated and dry land conditions. There was a positive correlation between needle nitrogen content and δ13C that was likely associated with increased photosynthetic capacity. There was some indication that decreased nitrogen supply led to increased stomatal conductance and hence lower WUE. There was a negative correlation between intrinsic water use efficiency and photosynthetic nitrogen use efficiency (NUE). This suggests that white spruce seedlings have the ability to maximize NUE when water becomes limited. There was significant genetic variation in NUE that was maintained across treatments. Our results suggest that in white spruce, there is no detectable effect of anaplerotic carbon fixation and that it is more appropriate to use a value of 29‰ (‘Rubisco only’) for the net discrimination against 13C during CO2 fixation. This leads to excellent correspondence between values of Ci/Ca derived from gas exchange measurements or from δ13C." @default.
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- W2023518220 date "1999-03-01" @default.
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- W2023518220 title "The effects of nitrogen stress on the stable carbon isotope composition, productivity and water use efficiency of white spruce (Picea glauca (Moench) Voss) seedlings" @default.
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- W2023518220 doi "https://doi.org/10.1046/j.1365-3040.1999.00400.x" @default.
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