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deoxyribonucleic acid water vapor pressure in the leaf (e,; or el in Sect. 2.5 of the Chapter 4A) or atmosphere (ea); also emissivity of a surface transpiration rate tortuosity rate of nutrient supply to the root surface; also chlorophyll fluorescence, minimal fluorescence (F0), maximum (Fm), in a pulse of saturating light (Fm'), variable (Fv) flavine adenine dinonucleotide (reduced form) fresh mass far-red diffusive conductance for CO2 (gc) and water vapor (gw); boundary layer conductance (ga); mesophyll conductance (gm); stomatal conductance (gs); boundary layer conductance for heat transport (gah) gibberellic acid glucose equivalent glutamine 2-oxoglutarate aminotransferase hydroxycyclohexenone high-irradiance response irradiance, above (Io) or beneath (I) a canopy; irradiance absorbed; also nutrient inflow maximum rate of nutrient inflow indoleacetic acid short-wave infrared radiation rate of photosynthetic electron flow maximum rate of photosynthetic electron flow measured at saturating I and Ca water flow rate of root elongation; extinction coefficient for light carrying capacity (e.g., Kspecies) catalytic constant of an enzyme inhibitor concentration giving half-maximum inhibition substrate concentration at half Vmax (or Imax) leaf area index rooting density; also latent heat of evaporation; also length of xylem element root hydraulic conductance leaf area index leaf area ratio low-fluence response light-harvesting complex leaf mass per unit area leaf mass ratio long-wave infrared radiation that is incident (LRin), reflected (LRr), emitted

(LRem), absorbed (SRabs), or net incoming (LRnet); also leaf respiration on an area

(LRa) and mass (LRm) basis messenger ribonucleic acid micro ribonucleic acid energy dissipated by metabolic processes malic enzyme mean residence time mol fraction, that is, the number of moles of water divided by the total number of moles nicotinamide adenine dinucleotide(phosphate) (in its oxidized form)

nicotinamide adenine dinucleotide(phosphate) (in its reduced form)

net assimilation rate normalized difference vegetation index net ecosystem production near-infrared reflectance; net rate of ion uptake nuclear magnetic resonance net primary production nonphotochemical quenching nitrogen-use efficiency, or nutrient-use efficiency

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