Increase in assimilatory nitrate reduction and photorespiration enhances CO2 assimilation under high light-induced photoinhibition in cotton

Guilherme, E. A.; Carvalho, Fernanda Torres de; Daloso, Danilo de Menezes; Silveira, Joaquim Albenísio Gomes da

doi:10.1016/j.envexpbot.2018.12.012

Cited by 19 publications

(9 citation statements)

References 38 publications

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“…A coordinated upregulation of carbon assimilation and nitrate reduction was induced by high PPFD in cotton, which supports the regulatory model shown in Figure 5 [ 147 ]. The effect of light on nitrate reduction was also confirmed in maize, in which nitrate reductase activity exhibited a diurnal rhythm with 2–3-fold higher activity during the light period compared to the dark ( Figure 5 ) [ 148 ].…”

Section: Light Intensity- and Spectrum-associated Adjustment Of Metab...supporting

confidence: 81%

Light Intensity- and Spectrum-Dependent Redox Regulation of Plant Metabolism

et al. 2022

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Both light intensity and spectrum (280–800 nm) affect photosynthesis and, consequently, the formation of reactive oxygen species (ROS) during photosynthetic electron transport. ROS, together with antioxidants, determine the redox environment in tissues and cells, which in turn has a major role in the adjustment of metabolism to changes in environmental conditions. This process is very important since there are great spatial (latitude, altitude) and temporal (daily, seasonal) changes in light conditions which are accompanied by fluctuations in temperature, water supply, and biotic stresses. The blue and red spectral regimens are decisive in the regulation of metabolism because of the absorption maximums of chlorophylls and the sensitivity of photoreceptors. Based on recent publications, photoreceptor-controlled transcription factors such as ELONGATED HYPOCOTYL5 (HY5) and changes in the cellular redox environment may have a major role in the coordinated fine-tuning of metabolic processes during changes in light conditions. This review gives an overview of the current knowledge of the light-associated redox control of basic metabolic pathways (carbon, nitrogen, amino acid, sulphur, lipid, and nucleic acid metabolism), secondary metabolism (terpenoids, flavonoids, and alkaloids), and related molecular mechanisms. Light condition-related reprogramming of metabolism is the basis for proper growth and development of plants; therefore, its better understanding can contribute to more efficient crop production in the future.

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Section: Light Intensity- and Spectrum-associated Adjustment Of Metab...supporting

confidence: 81%

Light Intensity- and Spectrum-Dependent Redox Regulation of Plant Metabolism

et al. 2022

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“…Although there was still a predominance of the 15 N‐amino acids derived from 15 NH 4 + in the roots, the amount of 15 NO 3 − ‐derived 15 N‐amino acids surpassed that for 15 NH 4 + in HL leaves, indicating major relevance of foliar NO 3 − assimilation in this condition. It remains to be evaluated whether the HL‐induced NO 3 − ‐assimilation by G. kunthiana leaves constitutes a photoprotective mechanism of photochemical quenching through the consumption of photosynthesis‐generated reductants and ATP, as observed in cotton leaves (Guilherme et al, 2019). This strategy could help this species to deal with the seasonal changes in luminosity of the understory in semi(deciduous) forests.…”

Section: Discussionmentioning

confidence: 99%

“…In both light intensities, C. pachystachya seedlings had a large predominance of NO 3 À in relation to amino acids in the xylem sap, in addition to high NR activity, especially in the leaves. This strategy (Guilherme et al, 2019). This strategy could help this species to deal with the seasonal changes in luminosity of the understory in semi(deciduous) forests.…”

Section: Principal Component Analysis Of Biochemical Datamentioning

confidence: 99%

Nitrogen use plasticity in response to light intensity in neotropical tree species of distinct functional groups

Debiasi

Calzavara

Sodek

et al. 2021

Physiologia Plantarum

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Environmental conditions influence the use of different nitrogen (N) sources by plants. We hypothesized that an increase in light intensity favors the use of nitrate (NO 3 À ) relative to ammonium (NH 4 + ) by seedlings of neotropical tree species from different functional groups, that is, Cecropia pachystachya (a shade-intolerant species), Cariniana estrellensis (a shade-tolerant canopy species), and Guarea kunthiana (a shade-tolerant understory species). We analyzed the growth and N metabolism in seedlings simultaneously provided with NH 4 + and NO 3 À , under lower (LL) and higher (HL) light intensity. 15 N incorporation into amino acids was monitored after incubation with 15 N-labeled NH 4 + or NO 3 À . Under HL, all species showed decreased leaf area ratio, and increased growth, nitrate reductase activity and assimilated N content. Cecropia pachystachya increased the use of both N sources under HL, with substantial increases in 15 N-amino acids derived from 15 NO 3 À (12.5-and 4.0-fold in roots and leaves, respectively) and 15 NH 4 + (4.5-and 3.0-fold in roots and leaves, respectively). Guarea kunthiana showed the greatest plasticity in N use, as the assimilation of 15 NO 3 À in roots and leaves increased substantially under HL (11.2-and 17.0-fold, respectively). Cariniana estrellensis increased the assimilation of 15 NH 4 + in roots and 15 NO 3 À in leaves under HL. Therefore, the responses of N use strategies to light intensity varied with the species according to their ecological characteristics.

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“…Together with it, biosynthesis of reductive power (NADP + ) of light reactions decreases under high temperature. This ultimately leads to photoinhibition and thereby decreases seed cotton yield (Guilherme et al 2019). Excessive absorption of light energy under heat destabilizes reaction center of photosystem-II (PS-II) (Du et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Exogenous Selenium-Instigated Physiochemical Transformations Impart Terminal Heat Tolerance in Bt Cotton

Saleem

Kamal

Shahid

et al. 2019

J Soil Sci Plant Nutr

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High temperature during reproductive stages of cotton is a major constraint to achieve potential yield of cotton. The aim of the present study was to determine comparative thermo-sensitivity of squaring and flowering, to optimize exogenous selenium for heat-stressed cotton, and to explore correlation among physiochemical and morphological attributes. The experiment was conducted during 2013 and repeated during 2014. The experiment was laid out in randomized complete block design under split plot arrangement and replicated thrice. Treatments were comprised of heat stress (H 0 = no heat imposition; H 1 = heat imposition at squaring; and H 2 = heat imposition at flowering) in main plot and varying foliar selenium concentrations (Se 0 = water spray/control; Se 50 = 50; Se 100 = 100; and Se 150 = 150 mg L-1 selenium) in split plot. Significantly, more antioxidants, chlorophyll contents, water relation attributes, seed cotton yield, and lesser hydrogen peroxide were recorded with 150 mg L-1 foliar selenium compared with other concentrations under H 0. While under H 1 and H 2 , statistically similar and significantly more antioxidants, chlorophyll contents, water relation attributes, seed cotton yield, and lesser hydrogen peroxide were observed for 100 and 150 mg L-1 selenium compared with other selenium concentrations. Conclusively, H 2 proved more thermolabile compared with H 1 , and application of 150 mg L-1 foliar selenium effectively alleviated adverse effects of heat. Moreover, we observed strong and significant associations of all physiochemical attributes with seed cotton yield.

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Increase in assimilatory nitrate reduction and photorespiration enhances CO2 assimilation under high light-induced photoinhibition in cotton

Cited by 19 publications

References 38 publications

Light Intensity- and Spectrum-Dependent Redox Regulation of Plant Metabolism

Light Intensity- and Spectrum-Dependent Redox Regulation of Plant Metabolism

Nitrogen use plasticity in response to light intensity in neotropical tree species of distinct functional groups

Exogenous Selenium-Instigated Physiochemical Transformations Impart Terminal Heat Tolerance in Bt Cotton

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