Carboxylating enzymes and carbonic anhydrase functions were suppressed by zinc deficiency in maize and chickpea plants

Salama, Zeinab A.; El‐Fouly, M. M.; Lazova, Galia N.; Попова, Л. Л.

doi:10.1007/bf02706627

Cited by 33 publications

(13 citation statements)

References 26 publications

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“…Previous studies in maize have used inhibitors to assess the impact of CA on rates of photosynthesis (Badger and Pfanz, 1995;Salama et al, 2006). By limiting zinc availability, a CA limitation can be imposed, as zinc is required for CA catalysis (Salama et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…By limiting zinc availability, a CA limitation can be imposed, as zinc is required for CA catalysis (Salama et al, 2006). However, zinc deficiency also results in a general reduction in photosynthesis and total protein in chickpea (Cicer arietinum; a C 3 plant), suggesting that the pleiotropic effects of zinc deficiency, not specifically CA limitation, are responsible for reduced rates of CO 2 fixation.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2014

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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 alleles of Ca1 and Ca2 in maize (Zea mays). These two isoforms account for more than 85% of the CA transcript pool. A significant change in isotopic discrimination is observed in mutant plants, which have as little as 3% of wild-type CA activity, but surprisingly, photosynthesis is not reduced under current or elevated CO2 partial pressure (pCO2). However, growth and rates of photosynthesis under subambient pCO2 are significantly impaired in the mutants. These findings suggest that, while CA is not limiting for C4 photosynthesis in maize at current pCO2, it likely maintains high rates of photosynthesis when CO2 availability is reduced. Current atmospheric CO2 levels now exceed 400 ppm (approximately 40.53 Pa) and contrast with the low-pCO2 conditions under which C4 plants expanded their range approximately 10 million years ago, when the global atmospheric CO2 was below 300 ppm (approximately 30.4 Pa). Thus, as CO2 levels continue to rise, selective pressures for high levels of CA may be limited to arid climates where stomatal closure reduces CO2 availability to the leaf.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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

et al. 2014

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“…Due to increase availability of Ca, Mg, Cu, Fe, Mn and P under prolonged submergence Zn availability and uptake hampered by the crops.Zinc is an important plant micronutrient for crop growth and higher production. Zinc (Zn) deficiency is the most widespread micronutrient disorder in rice (often combined with P deficiency), but efforts to develop cultivars with improved tolerance have been hampered by insufficient understanding of genetic factors contributing to tolerance [1]. Zinc is essential for several biochemical processes such as cytochrome and nucleotide synthesis, enzyme activation, chlorophyll production, maintenance of membrane activity, increase rate of seed and stalk maturation.…”

Section: Introductionmentioning

confidence: 99%

Zinc in Soil Environment for Plant Health and Management Strategy

Barman¹,

Das²,

Roy³

2018

ujar

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Zinc is an essential element for photosynthesis and its deficiency may play a role in the reduction of activity of rubisco and hence decreased rate of photosynthesis in higher plants. Zinc deficiency sometimes resembles Fe/Mn deficiencies. Under severe zinc deficiency the shoot apices die ('die-back') as is widely distributed. Zinc toxicity leads to chlorosis in young leaves. Induced manganese deficiency might also be of importance as high zinc supply strongly decreases the manganese content of plants. Most preventing measures for zinc deficiency are selection of Zn efficient variety that is tolerant to high level of bicarbonate as well as low zinc in soil. Curative measure for correcting are application of 20-25 kg/ha ZnSo4 in acid soil, 22 kg Zn/ha initially followed by 5-10 kg Zn in the later years or 50% gypsum + 10 t GM + 22 kg Zn once in 2-3 years in sodic soils, 1.0-1.5 kg/ha Zn as foliar spray at tillering stage and 2 times latter is very helpful for correct this deficiency. Zinc is very tightly bound to phytic acid and the formation of protein-zinc-phytic acid complexes increases the resistance to hydrolysis that leads to decrease in bioavailability of Zn to human and animals. Enrichment of cereal grains with Zn through both genetic (e.g., breeding) and agronomic (e.g., application of Zn fertilizers) biofortification is a high priority area of research, and will contribute to minimizing Zn-deficiency-related health problems in human populations.

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“…dicoccoides have 12% more Zn in the grain than RSLs carrying the allele from cultivated durum wheat [ref. 6 in Table S1]. The co-localization of four QTLs related with Zn concentration and content [ref.…”

Section: Qtl Identificationmentioning

confidence: 99%

“…A common problem is photosynthesis inhibition as a result of decreasing activity of photosynthetic enzymes, because Zn is needed for carbonic anhydrase activity and, therefore, Zn deficiency limits the supply of substrate for carboxylation [6]. In the early stages of Zn deficiency, the younger leaves become yellow or even necrotic.…”

mentioning

confidence: 99%

Got to hide your Zn away: Molecular control of Zn accumulation and biotechnological applications

et al. 2015

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Carboxylating enzymes and carbonic anhydrase functions were suppressed by zinc deficiency in maize and chickpea plants

Cited by 33 publications

References 26 publications

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

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

Zinc in Soil Environment for Plant Health and Management Strategy

Got to hide your Zn away: Molecular control of Zn accumulation and biotechnological applications

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