Modelling photosynthesis in fluctuating light with inclusion of stomatal conductance, biochemical activation and pools of key photosynthetic intermediates

Planta ◽  
1997 ◽  
Vol 204 (1) ◽  
pp. 16-26 ◽  
Author(s):  
M. U. F. Kirschbaum ◽  
M. Küppers ◽  
H. Schneider ◽  
C. Giersch ◽  
S. Noe
Keyword(s):  
Stomatal Conductance ◽  
Fluctuating Light ◽  
Biochemical Activation

scholarly journals High-yielding rice Takanari has superior photosynthetic response to a commercial rice Koshihikari under fluctuating light

2019 ◽  
Vol 70 (19) ◽  
pp. 5287-5297 ◽  
Author(s):  
Shunsuke Adachi ◽  
Yu Tanaka ◽  
Atsuko Miyagi ◽  
Makoto Kashima ◽  
Ayumi Tezuka ◽  
...  
Keyword(s):  
Electron Transport ◽  
Stomatal Conductance ◽  
Metabolic Flux ◽  
Electron Transport Rate ◽  
Rice Cultivar ◽  
Carbon Gain ◽  
High Electron ◽  
Photosynthetic Induction ◽  
Photosynthetic Response ◽  
Fluctuating Light

The high-yielding rice cultivar Takanari has fast photosynthetic induction owing to a high electron transport rate, stomatal conductance, and metabolic flux, leading to high daily carbon gain under fluctuating light.

scholarly journals Diurnal Response of Photosystem I to Fluctuating Light Is Affected by Stomatal Conductance

Cells ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 3128
Author(s):  
Ting-Yu Li ◽  
Qi Shi ◽  
Hu Sun ◽  
Ming Yue ◽  
Shi-Bao Zhang ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Redox State ◽  
Electron Flow ◽  
High Light ◽  
Primary Metabolism ◽  
Diurnal Changes ◽  
Late Afternoon ◽  
Fluctuating Light ◽  
Photosynthetic Regulation ◽  
Sudden Transition

Upon a sudden transition from low to high light, electrons transported from photosystem II (PSII) to PSI should be rapidly consumed by downstream sinks to avoid the over-reduction of PSI. However, the over-reduction of PSI under fluctuating light might be accelerated if primary metabolism is restricted by low stomatal conductance. To test this hypothesis, we measured the effect of diurnal changes in stomatal conductance on photosynthetic regulation under fluctuating light in tomato (Solanum lycopersicum) and common mulberry (Morus alba). Under conditions of high stomatal conductance, we observed PSI over-reduction within the first 10 s after transition from low to high light. Lower stomatal conductance limited the activity of the Calvin–Benson–Bassham cycle and aggravated PSI over-reduction within 10 s after the light transition. We also observed PSI over-reduction after transition from low to high light for 30 s at the low stomatal conductance typical of the late afternoon, indicating that low stomatal conductance extends the period of PSI over-reduction under fluctuating light. Therefore, diurnal changes in stomatal conductance significantly affect the PSI redox state under fluctuating light. Moreover, our analysis revealed an unexpected inhibition of cyclic electron flow by the severe over-reduction of PSI seen at low stomatal conductance. In conclusion, stomatal conductance can have a large effect on thylakoid reactions under fluctuating light.

scholarly journals Photosynthesis across African cassava germplasm is limited by Rubisco and mesophyll conductance at steady state, but by stomatal conductance in fluctuating light

2019 ◽  
Vol 225 (6) ◽  
pp. 2498-2512 ◽  
Author(s):  
Amanda P. De Souza ◽  
Yu Wang ◽  
Douglas J. Orr ◽  
Elizabete Carmo‐Silva ◽  
Stephen P. Long
Keyword(s):  
Steady State ◽  
Stomatal Conductance ◽  
Mesophyll Conductance ◽  
Fluctuating Light

Improved stomatal opening enhances photosynthetic rate and biomass production in fluctuating light

2020 ◽  
Vol 71 (7) ◽  
pp. 2339-2350 ◽  
Author(s):  
Haruki Kimura ◽  
Mimi Hashimoto-Sugimoto ◽  
Koh Iba ◽  
Ichiro Terashima ◽  
Wataru Yamori
Keyword(s):  
Stomatal Conductance ◽  
Plant Growth ◽  
Photosynthetic Rate ◽  
Anion Channel ◽  
Biomass Accumulation ◽  
Stomatal Opening ◽  
Wild Type ◽  
Photosynthetic Rates ◽  
Fluctuating Light ◽  
Overexpression Line

Abstract It has been reported that stomatal conductance often limits the steady-state photosynthetic rate. On the other hand, the stomatal limitation of photosynthesis in fluctuating light remains largely unknown, although in nature light fluctuates due to changes in sun position, cloud cover, and the overshadowing canopy. In this study, we analysed three mutant lines of Arabidopsis with increased stomatal conductance to examine to what extent stomatal opening limits photosynthesis in fluctuating light. The slac1 (slow anion channel-associated 1) and ost1 (open stomata 1) mutants with stay-open stomata, and the PATROL1 (proton ATPase translocation control 1) overexpression line with faster stomatal opening responses exhibited higher photosynthetic rates and plant growth in fluctuating light than the wild-type, whereas these four lines showed similar photosynthetic rates and plant growth in constant light. The slac1 and ost1 mutants tended to keep their stomata open in fluctuating light, resulting in lower water-use efficiency (WUE) than the wild-type. However, the PATROL1 overexpression line closed stomata when needed and opened stomata immediately upon irradiation, resulting in similar WUE to the wild-type. The present study clearly shows that there is room to optimize stomatal responses, leading to greater photosynthesis and biomass accumulation in fluctuating light in nature.

scholarly journals Acclimation to Fluctuating Light Impacts the Rapidity of Response and Diurnal Rhythm of Stomatal Conductance

2018 ◽  
Vol 176 (3) ◽  
pp. 1939-1951 ◽  
Author(s):  
Jack S.A. Matthews ◽  
Silvere Vialet-Chabrand ◽  
Tracy Lawson
Keyword(s):  
Stomatal Conductance ◽  
Diurnal Rhythm ◽  
Fluctuating Light

scholarly journals Rapid stomatal response to fluctuating light: an under-explored mechanism to improve drought tolerance in rice

2016 ◽  
Vol 43 (8) ◽  
pp. 727 ◽  
Author(s):  
Mingnan Qu ◽  
Saber Hamdani ◽  
Wenzhen Li ◽  
Shimei Wang ◽  
Jiuyou Tang ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Drought Tolerance ◽  
Water Use Efficiency ◽  
Water Use ◽  
A Priori ◽  
Carbon Assimilation ◽  
Co2 Uptake ◽  
Stomatal Response ◽  
Fluctuating Light ◽  
Use Efficiency

Light inside a canopy constantly fluctuates. Under fluctuating light (FL) conditions, stomatal conductance and photosynthetic rate constantly change. In this study, we explored whether this dynamics of stomata movements upon FL influenced the water use efficiency of rice in the field. We used a USDA-curated rice mini-core diversity panel consisting of 204 worldwide distributed accessions. A priori model on dynamic stomatal response to FL was utilised to identify kinetic parameters describing the stomatal delays during the closing (τcl) and the opening (τop) phase. Result showed that τcl had a larger variation than τop across the mini-core panel. τcl was negatively correlated with water use efficiency (WUE) related traits, stem diameter, grain weight per tiller and heading time, but positively correlated with maximum annual temperature, carbon assimilation related traits and biomass (P < 0.05). We further showed a strong correlation of τcl with the relative decrease of biomass under drought in 14 accessions with different τcl. We discussed the adjustment of stomatal conductance under fluctuating light in light of the trade-off between optimising CO2 uptake and optimising water saving. This study suggests that stomatal dynamics under fluctuating light is closely related to drought resistance and hence detailed study is needed to enable its application in breeding drought tolerance in rice.

scholarly journals Chlorophyll Fluorescence and Stomatal Conductance of Ten Sugarcane Varieties under Waterlogging and Fluctuation Light Intensity

2018 ◽  
Author(s):  
Mochamad Arief Soleh, Mira Ariyanti, Intan Ratna Dewi, Muhamad Kadapi
Keyword(s):  
Chlorophyll Fluorescence ◽  
Stomatal Conductance ◽  
Light Intensity ◽  
Maximum Quantum Yield ◽  
Soil Drainage ◽  
Natural Conditions ◽  
Sugarcane Varieties ◽  
Fluctuating Light ◽  
Highly Sensitive ◽  
Poor Soil

Under natural conditions, plants are often subjected to waterlogging due to poor soil drainage and or exessive rainfall. This condition leads to reduced maximum quantum yield of photosystem II (fv/fm) under suboptimal growing system. Under well-watered conditions (WW), the fv/fm of ten varieties of sugarcane were maintained at more than 0.78. However, following waterlogging for 4 days and a constant light of 3000 mmolmol-1 for 60s, the fv/fm of ten varieties of sugarcene varied from 0.587 in PS882 (V4) to 0.740 in GMP2 (V9). Meanwhile, under fluctuating light intensity from dark to highlight of 1600 mmolmol-1, the fv/fm of all varieties decreased to below of 0.1 except in the genotype PSJK922 (V5) at 28 DAT (day after treatment) of waterlogging. This difference was then further examined through measurements of stomatal conductance (gs) among the varieties. There was negative correllation between fv/fm and stomatal conductance, high gs was not associated with lower fv/fm. Dendrogam analyses showed the variety of PS881 (V1), PS864 (V3) and Kidang Kencana (KK) were highly sensitive to waterlogging. These results suggest potential screening of plants based on improve fv/fm under abiotic condition.

scholarly journals Drivers of Natural Variation in Water-Use Efficiency Under Fluctuating Light Are Promising Targets for Improvement in Sorghum

2021 ◽  
Vol 12 ◽  
Author(s):  
Charles P. Pignon ◽  
Andrew D. B. Leakey ◽  
Stephen P. Long ◽  
Johannes Kromdijk
Keyword(s):  
Steady State ◽  
Stomatal Conductance ◽  
Water Use Efficiency ◽  
Water Use ◽  
Plant Performance ◽  
Fluctuating Light ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
Natural Diversity ◽  
Highly Correlated

Improving leaf intrinsic water-use efficiency (iWUE), the ratio of photosynthetic CO2 assimilation to stomatal conductance, could decrease crop freshwater consumption. iWUE has primarily been studied under steady-state light, but light in crop stands rapidly fluctuates. Leaf responses to these fluctuations substantially affect overall plant performance. Notably, photosynthesis responds faster than stomata to decreases in light intensity: this desynchronization results in substantial loss of iWUE. Traits that could improve iWUE under fluctuating light, such as faster stomatal movement to better synchronize stomata with photosynthesis, show significant natural diversity in C3 species. However, C4 crops have been less closely investigated. Additionally, while modification of photosynthetic or stomatal traits independent of one another will theoretically have a proportionate effect on iWUE, in reality these traits are inter-dependent. It is unclear how interactions between photosynthesis and stomata affect natural diversity in iWUE, and whether some traits are more tractable drivers to improve iWUE. Here, measurements of photosynthesis, stomatal conductance and iWUE under steady-state and fluctuating light, along with stomatal patterning, were obtained in 18 field-grown accessions of the C4 crop sorghum. These traits showed significant natural diversity but were highly correlated, with important implications for improvement of iWUE. Some features, such as gradual responses of photosynthesis to decreases in light, appeared promising for improvement of iWUE. Other traits showed tradeoffs that negated benefits to iWUE, e.g., accessions with faster stomatal responses to decreases in light, expected to benefit iWUE, also displayed more abrupt losses in photosynthesis, resulting in overall lower iWUE. Genetic engineering might be needed to break these natural tradeoffs and achieve optimal trait combinations, e.g., leaves with fewer, smaller stomata, more sensitive to changes in photosynthesis. Traits describing iWUE at steady-state, and the change in iWUE following decreases in light, were important contributors to overall iWUE under fluctuating light.

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