carbonic anhydrase/кукуруза сахарная

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Carbonic Anhydrase Mutants in Zea mays Have Altered Stomatal Responses to Environmental Signals.

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Stomata regulate transpirational water loss and CO2 uptake for photosynthesis in response to changing environmental conditions. Research investigating stomatal movement has mostly been conducted in C3 eudicot species, which have very different CO2 requirements for photosynthesis relative to C4

A structural investigation of complex I and I+III2 supercomplex from Zea mays at 11-13 A resolution: assignment of the carbonic anhydrase domain and evidence for structural heterogeneity within complex I.

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The projection structures of complex I and the I+III2 supercomplex from the C4 plant Zea mays were determined by electron microscopy and single particle image analysis to a resolution of up to 11 A. Maize complex I has a typical L-shape. Additionally, it has a large hydrophilic extra-domain attached

Effects of intraleaf variations in carbonic anhydrase activity and gas exchange on leaf C18OO isoflux in Zea mays.

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Variation in the C18OO content of atmospheric CO2 (delta18Oa) can be used to distinguish photosynthesis from soil respiration, which is based on carbonic anhydrase (CA)-catalyzed 18O exchange between CO2 and 18O-enriched leaf water (delta18Ow). Here we tested the hypothesis that mean leaf delta18Ow

A two-dimensional microscale model of gas exchange during photosynthesis in maize (Zea mays L.) leaves.

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CO2 exchange in leaves of maize (Zea mays L.) was examined using a microscale model of combined gas diffusion and C4 photosynthesis kinetics at the leaf tissue level. Based on a generalized scheme of photosynthesis in NADP-malic enzyme type C4 plants, the model accounted for CO2 diffusion in a leaf

Glutamine Induces the N-Dependent Accumulation of mRNAs Encoding Phosphoenolpyruvate Carboxylase and Carbonic Anhydrase in Detached Maize Leaf Tissue.

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We have used detached leaves to study the N-dependent control of expression of phosphoenolpyruvate carboxylase (PEPC) and carbonic anhydrase (CA) genes in maize (Zea mays L. cv Golden Cross Bantam T51). Following supplementation with an N-source and zeatin, PEPC and CA mRNA levels increased in

Extrinsic photosystem II carbonic anhydrase in maize mesophyll chloroplasts.

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One form of carbonic anhydrase (CA) has been observed in maize (Zea mays) thylakoids and photosystem II (PSII)-enriched membranes. Here, we show that an antibody produced against a thylakoid lumen-targeted CA found in Chlamydomonas reinhardtii reacts with a single 33-kD polypeptide in maize

Insights from transcriptome profiling on the non-photosynthetic and stomatal signaling response of maize carbonic anhydrase mutants to low CO2.

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BACKGROUND

Carbonic anhydrase (CA) catalyzes the hydration of CO₂ in the first biochemical step of C₄ photosynthesis, and has been considered a potentially rate-limiting step when CO₂ availability within a leaf is low. Previous work in Zea mays

Cytokinin Is Required to Induce the Nitrogen-Dependent Accumulation of mRNAs for Phosphoenolpyruvate Carboxylase and Carbonic Anhydrase in Detached Maize Leaves.

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Previous studies with intact maize (Zea mays L.) plants indicated that phosphoenolpyruvate carboxylase (PEPC) levels are controlled by nitrogen (N) availability and that this regulation is presumably at the transcriptional level (B. Sugiharto, K. Miyata, H. Nakamoto, H. Sasakawa, T. Sugiyama [1990]

Light Induction and the Effect of Nitrogen Status upon the Activity of Carbonic Anhydrase in Maize Leaves.

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The regulation of carbonic anhydrase (CA) activity in maize (Zea mays L.) leaves by light and nitrogen nutrition was determined. CA activity increased by more than 100-fold in illuminated leaves and decreased in leaves placed in the dark; low levels of CA activity were observed in leaves illuminated

The distribution of carbonic anhydrase and ribulose diphosphate carboxylase in maize leaves.

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Extraction of maize (Zea mays) leaves by progressive grinding under suitably protective conditions yields total carbonic anhydrase activities (4800 units per milligram chlorophyll) comparable to the activity in spinach (Spinacia oleracea) leaves. The total ribulose diphosphate carboxylase activity

Carbonic anhydrase assay: strong inhibition of the leaf enzyme by CO2 in certain buffers.

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Apparent carbonic anhydrase activity in leaf extracts, measured as the rate of H+ production associated with the CO2 hydration reaction, varied by as much as 25-fold when the assay buffer was varied. Highest activities were usually recorded in barbitone buffer, with lower activities in imidazole,

Mesophyll conductance in Zea mays responds transiently to CO2 availability: implications for transpiration efficiency in C4 crops.

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Mesophyll conductance (gm ) describes the movement of CO2 from the intercellular air spaces below the stomata to the site of initial carboxylation in the mesophyll. In contrast with C3 -gm , little is currently known about the intraspecific variation in C4 -gm or its responsiveness to environmental

A Limited Role for Carbonic Anhydrase in C4 Photosynthesis as Revealed by a ca1ca2 Double Mutant in Maize.

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Carbonic anhydrase (CA) catalyzes the first biochemical step of the carbon-concentrating mechanism of C4 plants, and in C4 monocots it has been suggested that CA activity is near limiting for photosynthesis. Here, we test this hypothesis through the characterization of transposon-induced mutant

The response of mesophyll conductance to short-term variation in CO2 in the C4 plants Setaria viridis and Zea mays.

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Mesophyll conductance (gm) limits rates of C3 photosynthesis but little is known about its role in C4 photosynthesis. If gm were to limit C4 photosynthesis, it would likely be at low CO2 concentrations (pCO2). However, data on C4-gm across ranges of pCO2 are scarce. We describe the response of C4-gm

Quantitation of Rates of Transport, Metabolic Fluxes, and Cytoplasmic Levels of Inorganic Carbon in Maize Root Tips during K Ion Uptake.

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Our aim was to determine whether fixation of inorganic carbon (C(i)), due to phosphoenolpyruvate carboxylase activity, is limited by the availability of C(i) in the cytoplasm of maize (Zea mays L.) root tips. Rates of C(i) uptake and metabolism were measured during K(2)SO(4) treatment, which

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