Effect of K application on leaf carbonic anhydrase and nitrate reductase activities, photosynthetic characteristics, NPK and NO&lt;sub&gt;3&lt;/sub&gt; contents, growth, and yield of mustard

Mohammad, Firoz; Naseem, Usama

doi:10.1007/s11099-006-0053-2

Cited by 19 publications

(18 citation statements)

References 8 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These changes would damage mesophyll cell homeostasis and reduce photosynthetic capacity (Kunz et al , Laterre et al ). Additionally, a high leaf N/K ratio decreases the content of nitrate reductase, glutamine synthetase, glutamate synthase and other critical enzymes and influences leaf growth (Mohammad and Naseem , Hu et al ). Dong et al () reported higher production in cotton supplied with an appropriate N/K ratio than in plants grown with high N and low K. Additionally, increased K fertilizer application promoted N use efficiency, and the apparent N use efficiency with appropriate N/K was much higher than that with higher or lower N/K ratio (Grzebisz et al ).…”

Section: Discussionmentioning

confidence: 99%

Leaf photosynthetic capacity is regulated by the interaction of nitrogen and potassium through coordination of CO₂ diffusion and carboxylation

Ren

Meng

et al. 2019

Physiologia Plantarum

View full text Add to dashboard Cite

Combined application of nitrogen (N) and potassium (K) fertilizer could significantly enhance crop yield. Crop yield and photosynthesis are inseparable. However, the influence of N and K interaction on photosynthesis is still not fully understood. Field and hydroponic experiments were conducted to examine the effects of N and K interaction on leaf photosynthesis characteristics and to explore the mechanisms in the hydroponic experiment. CO2 conductance and carboxylation characteristic parameters of oilseed leaves were measured under different N and K supplies. Results indicated that detectable increases in leaf area, biomass and net photosynthetic rate (An) were observed under optimal N and K supply in field and hydroponic experiments. The ratio of total CO2 diffusion conductance to the maximum carboxylation rate (gtot/Vcmax) and An presented a linear‐plateau relationship. Under insufficient N, increased K contributed to the CO2 transmission capacity and improved the proportion of N used for carboxylation, promoting gtot/Vcmax. However, the low Vcmax associated with N insufficiency limited the An. High N supply obviously accelerated Vcmax, yet K deficiency led to a reduction of gtot, which restricted Vcmax. Synchronous increases in N and K supplementation ensured the appropriate ratio of N to K content in leaves, which simultaneously facilitated gtot and Vcmax and preserved a gtot/Vcmax suitable for guaranteeing CO2 transmission and carboxylation coordination; the overall effect was increased An and leaf area. These results highlight the suitable N and K nutrients to coordinate CO2 diffusion and carboxylation, thereby enhancing photosynthetic capacity and area to obtain high crop yield.

show abstract

Section: Discussionmentioning

confidence: 99%

Leaf photosynthetic capacity is regulated by the interaction of nitrogen and potassium through coordination of CO₂ diffusion and carboxylation

Ren

Meng

et al. 2019

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…() showed a minor effect of CA on leaf photosynthesis by reducing leaf CA level through genetic transformants. Potassium starvation can reduce CA activities (Mohammad & Naseem ), which may increase CO 2 diffusion resistance. Additionally, Terashima et al .…”

Section: Discussionmentioning

confidence: 99%

Anatomical variation of mesophyll conductance under potassium deficiency has a vital role in determining leaf photosynthesis

Lü

Pan

et al. 2016

Plant Cell & Environment

118

View full text Add to dashboard Cite

Leaves exposed to potassium (K) deficiency usually present decreased mesophyll conductance (g ) and photosynthesis (A). The relative contributions of leaf anatomical traits in determining g have been quantified; however, anatomical variabilities related to low g under K starvation remain imperfectly known. A one-dimensional model was used to quantify anatomical controls of the entire CO diffusion pathway resistance within a leaf on two Brassica napus L. cultivars in response to K deficiency. Leaf photosynthesis of both cultivars was significantly decreased under K deficiency in parallel with down-regulated g . The mesophyll conductance limitation contributed to more than one-half of A decline. The decreased internal air space in K-starved leaves was associated with the increase of gas-phase resistance. Potassium deficiency reduced liquid-phase conductance by decreasing the exposed surface area of chloroplasts per unit leaf area (S /S), and enlarging the resistance of the cytoplasm that can be interpreted by the increasing distance of chloroplast from cell wall, and between adjacent chloroplasts. Additionally, the discrepancies of A between two cultivars were in part because of g variations, ascribing to an altered S /S. These results emphasize the important role of K on the regulation of g by enhancing S /S and reducing cytoplasm resistance.

show abstract

“…Furthermore, CO 2 diffusion through the cytosol and the chloroplast stroma is likely to be facilitated by the activity of carbonic anhydrases, a group of enzymes that catalyze the interconversion between CO 2 and HCO 3 − and might therefore increase the rate of CO 2 delivery to Rubisco (Berghuijs et al ). Increased leaf K concentrations enhanced the activity of carbonic anhydrases in leaves of Brassica juncea (Mohammad and Naseem ), but a general evidence for the linkage between carbonic anhydrase activity and mesophyll conductance under K‐deficient conditions is missing so far.…”

Section: K and Mg Involvement In Photosynthesismentioning

confidence: 99%

Functioning of potassium and magnesium in photosynthesis, photosynthate translocation and photoprotection

Tränkner

Tavakol

Jákli

2018

Physiologia Plantarum

405

193

View full text Add to dashboard Cite

Potassium (K) and magnesium (Mg) are mineral nutrients that are required in large quantities by plants. Both elements critically contribute to the process of photosynthesis and the subsequent long-distance transport of photoassimilates. If K or Mg is not present in sufficient quantities in photosynthetic tissues, complex interactions of anatomical, physiological and biochemical responses result in a reduction of photosynthetic carbon assimilation. As a consequence, excessive production of reactive oxygen species causes photo-oxidation of the photosynthetic apparatus and causes an up-regulation of photoprotective mechanisms. In this article, we review the functioning of K and Mg in processes directly or indirectly associated with photosynthesis. Focus is given to chloroplast ultrastructure, light-dependent and -independent reactions of photosynthesis and the diffusion of CO - a major substrate for photosynthesis - into chloroplasts. We further emphasize their contribution to phloem-loading and long-distance transport of photoassimilates and to the photoprotection of the photosynthetic apparatus.

show abstract

Effect of K application on leaf carbonic anhydrase and nitrate reductase activities, photosynthetic characteristics, NPK and NO<sub>3</sub> contents, growth, and yield of mustard

Abstract: In a sand culture experiment on mustard (Brassica juncea L. Czern. & Coss) cv. Varuna, all tested characteristics at 60 d stage and yield characteristics at harvest were enhanced by K application as its levels increased from 5 to 10, 15, 20, 25, and 30 mM K, with 20 mM K proving best.

Cited by 19 publications

References 8 publications

Leaf photosynthetic capacity is regulated by the interaction of nitrogen and potassium through coordination of CO₂ diffusion and carboxylation

Leaf photosynthetic capacity is regulated by the interaction of nitrogen and potassium through coordination of CO₂ diffusion and carboxylation

Anatomical variation of mesophyll conductance under potassium deficiency has a vital role in determining leaf photosynthesis

Functioning of potassium and magnesium in photosynthesis, photosynthate translocation and photoprotection

Contact Info

Product

Resources

About

Effect of K application on leaf carbonic anhydrase and nitrate reductase activities, photosynthetic characteristics, NPK and NO<sub>3</sub> contents, growth, and yield of mustard

Abstract: In a sand culture experiment on mustard (Brassica juncea L. Czern. & Coss) cv. Varuna, all tested characteristics at 60 d stage and yield characteristics at harvest were enhanced by K application as its levels increased from 5 to 10, 15, 20, 25, and 30 mM K, with 20 mM K proving best.

Cited by 19 publications

References 8 publications

Leaf photosynthetic capacity is regulated by the interaction of nitrogen and potassium through coordination of CO2 diffusion and carboxylation

Leaf photosynthetic capacity is regulated by the interaction of nitrogen and potassium through coordination of CO2 diffusion and carboxylation

Anatomical variation of mesophyll conductance under potassium deficiency has a vital role in determining leaf photosynthesis

Functioning of potassium and magnesium in photosynthesis, photosynthate translocation and photoprotection

Contact Info

Product

Resources

About

Leaf photosynthetic capacity is regulated by the interaction of nitrogen and potassium through coordination of CO₂ diffusion and carboxylation

Leaf photosynthetic capacity is regulated by the interaction of nitrogen and potassium through coordination of CO₂ diffusion and carboxylation