Online CO 2 and H 2 O oxygen isotope fractionation allows estimation of mesophyll conductance in C 4 plants, and reveals that mesophyll conductance decreases as leaves age in both C 4 and C 3 plants
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چکیده
منابع مشابه
Internal conductance to CO(2) diffusion and C(18)OO discrimination in C(3) leaves.
(18)O discrimination in CO(2) stems from the oxygen exchange between (18)O-enriched water and CO(2) in the chloroplast, a process catalyzed by carbonic anhydrase (CA). A proportion of this (18)O-labeled CO(2) escapes back to the atmosphere, resulting in an effective discrimination against C(18)OO during photosynthesis (Delta(18)O). By constraining the delta(18)O of chloroplast water (delta(e)) ...
متن کاملVariation in Quantum Yield for CO(2) Uptake among C(3) and C(4) Plants.
The quantum yield for CO(2) uptake was measured on a number of C(3) and C(4) monocot and dicot species. Under normal atmospheric conditions (330 microliters per liter CO(2), 21% O(2)) and a leaf temperature of 30 degrees C, the average quantum yields (moles CO(2) per einstein) were as follows: 0.052 for C(3) dicots, 0.053 for C(3) grasses, 0.053 for NAD-malic enzyme type C(4) dicots, 0.060 for ...
متن کاملQuantum Yields for CO(2) Uptake in C(3) and C(4) Plants: Dependence on Temperature, CO(2), and O(2) Concentration.
The quantum yields of C(3) and C(4) plants from a number of genera and families as well as from ecologically diverse habitats were measured in normal air of 21% O(2) and in 2% O(2). At 30 C, the quantum yields of C(3) plants averaged 0.0524 +/- 0.0014 mol CO(2)/absorbed einstein and 0.0733 +/- 0.0008 mol CO(2)/absorbed einstein under 21 and 2% O(2). At 30 C, the quantum yields of C(4) plants av...
متن کاملPhotophosphorylation by mesophyll and bundle sheath chloroplasts of c(4) plants.
Leaves of plants possessing the C4-dicarboxylic acid CO2fixation pathway (14) are characterized by outer mesophyll cells containing granal chloroplasts and inner bundle sheath cells which contain chloroplasts with varying degrees of grana development depending on the species. As judged by Hill activities and fluorescence yield, bundle sheath chloroplasts which contain few grana have less photos...
متن کاملPhotoreduction of oxygen in mesophyll chloroplasts of c(4) plants: a model system for studying an in vivo mehler reaction.
Mesophyll chloroplasts of three C(4) sub types, Panicum miliaceum (NAD-malic enzyme), Panicum maximum (PCK), and Zea mays (NADP-malic enzyme), were prepared from protoplast extracts and used to study the photoreduction of O(2). The processes of O(2) uptake and evolution in these preparations, which lack ribulose 1,5-bisphosphate carboxylase/oxygenase, were studied simultaneously using stable is...
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ژورنال
عنوان ژورنال: New Phytologist
سال: 2016
ISSN: 0028-646X,1469-8137
DOI: 10.1111/nph.13830