Crop photosynthetic response to light quality and light intensity

Shafiq, Iram; Hussain, Sajad; Raza, Muhammad Ali; Iqbal, Nasır; Asghar, Muhammad Ahsan; Raza, Ali; Fan, Yuanfang; Mumtaz, Maryam; Shoaib, Muhammad; Ansar, Muhammad; Manaf, Abdul; Yang, Wenyu; Yang, Feng

doi:10.1016/s2095-3119(20)63227-0

Cited by 106 publications

(72 citation statements)

References 219 publications

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“…Light is the most rapidly changing factor among other environmental limitations; thus, plants need to adjust their fitness and perform the physiological functions necessary for growth and development. Light quality and quantity both greatly influence the carbon metabolism via photosynthesis and also affect other parameters related to plant growth, development, and metabolism at morpho-physiological, biochemical, and molecular levels [2]. Yang et al [3] suggest that both light quality and intensity affected plant physiology and biochemistry via changes in photosynthesis, leaf anatomy, and hormone contents.…”

Section: Introductionmentioning

confidence: 99%

Low Light Alters the Photosynthesis Process in Cigar Tobacco via Modulation of the Chlorophyll Content, Chlorophyll Fluorescence, and Gene Expression

Khan

Gao

et al. 2021

Agriculture

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Shading or low light (LL) conditions are a key and necessary cultivation technique in cigar wrapper tobacco production. However, the effect of low light on the photosynthesis in cigar tobacco is not clear. Therefore, this study is designed to know the photosynthesis of cigar tobacco under different light intensities (T200, T100, and T50 μmol m−2 s−1). The results reveal that under low light, T50 especially improved the light interception and increased carbon utilization, as witnessed by a higher specific leaf area and lower specific leaf weight. Low light intensity caused better light interception and carbon utilization in cigar tobacco leaves, and thus thinner leaves are more able to use low light efficiently. The chlorophyll content is related to the photosynthesis process; thus, LL affected the photosynthesis process by lowering the chlorophyll content. Similarly, LL also altered the photosynthetic efficiency by lowering the QY_Lss, qP_Lss, and Rfd_Lss. Additionally, higher expression of Lhcb4.2, Lhcb6, PsbA, PsbB, and PsbD under low light, especially T50, shows that the PSII and antenna proteins complex efficiently utilized the absorbed energy for photosynthesis. Finally, the lower photosynthesis, particularly in T50, is attributed to the downregulation of genes related to NADPH production (petH) and the rubisco enzyme synthesis-related gene (rbcs) for CO2 fixation in the Calvin cycle. Overall, the results show that the photosynthesis is decreased under LL intensities which might be related to lower chlorophyll content and downregulation of petH and rbcs genes.

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Section: Introductionmentioning

confidence: 99%

Low Light Alters the Photosynthesis Process in Cigar Tobacco via Modulation of the Chlorophyll Content, Chlorophyll Fluorescence, and Gene Expression

Khan

Gao

et al. 2021

Agriculture

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“…The stomatal opening process is due to the stimuli of the day (radiation, temperature, etc.) and morphological changes (such as size, shape and mobility) of a given species (Franklin, 2016;Hussain et al, 2019;Shafiq et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

“…Chlorophylls are essential in the photosynthetic process, which is divided in two stages. The first is photochemistry and has the function of capturing atmospheric CO2, the second is biochemistry, which has the role of promoting the biosynthesis of proteins and enzymes resulting from the previous step (Shafiq et al, 2021). Rozalino Santos et al (2014) characterized the genus Brachiaria as a genus that has high phenotypic plasticity, being able to modify its structure, according to the type of management adopted.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Brachiaria decumbens ‘Basilisk’ pasture subjected to flexible grazing by sheep

Conrado

Lopes

Cândido

et al. 2021

Chil. j. agric. res.

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The sustainability of animal production on pasture is based on improving the management of forage species used, which ensures increase in animal productivity, pasture perenniality and cost reduction. The objective was to characterize productive, structural, physiological and normalized difference vegetation index (NDVI) responses of Brachiaria decumbens Stapf 'Basilisk' over the flexibilization of the grazing management adopted. Four defoliation combinations were evaluated, which consisted of the arrangement of two (85% and 95%) light interceptions (LI) and two (1.3 and 1.8) residual leaf area indexes (RLAI), as parameters of entry and exit of the animals from the pasture, respectively. Higher total forage biomass was observed (TFB, kg DM ha -1 ) 18.82%, when the canopy was managed at the lowest defoliation frequencies (95% LI), but with a higher morphological composition of the stem component and dead material. The 95% LI produced an extra layer of leaves than the canopy managed at 85% LI. The physiological variables were affected by the higher frequency of defoliation (85% LI), with lower photosynthetic rates. NDVI was higher in the canopy managed in the pre-grazing condition at 95% LI (0.88) and residual condition at 1.8 RLAI (0.49), when compared to 85% LI (0.86) and 1.3 RLAI (0.44). For greater production per animal, managing at 85% LI × 1.8 RLAI with pre-grazing and residual NDVI of 0.85 and 0.49, respectively, is the most suitable while for greater animal production per area, managing at 95% LI × 1.3 RLAI with pre-grazing and residual NDVI of 0.88 and 0.44, respectively, becomes more efficient.

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“…Lower values are possible because the constituents of the correlation can promote values on a larger scale than the evaluated unit and also less than -1 (Rodrigues et al, 2010). This ccould be associated with the rapid stem fraction development and leaf area reduction of the pastures when reaching critical LAI, contributing to decreasing the quality of light that reaches the interior of the canopy (Shafiq et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

Prediction of Brachiaria decumbens forage biomass using structural characteristics

Conrado

Lopes

Cândido

et al. 2021

Chil. j. agric. res.

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Tools that generate models with good biomass predictive capacity are essential to maintain the sustainability of production systems. The objective was to analyze the relationship between forage biomass and structural variables and generate models to predict total forage biomass (TFB) and green leaf blade biomass (GLB). Irrigated pastures of Brachiaria decumbens Stapf 'Basilisk' were kept under rotational stocking with sheep (Ovis aries L.) The TFB, GLB, leaf area index (LAI), height (cm), and normalized difference vegetation index (NDVI) were evaluated. The experimental design was completely randomized with four replicates: ten and five cycles of defoliation management, respectively, were used to generate and validate the stages of the models. The best goodness of fit was obtained by nonlinear models for both TFB and GLB, which can be confirmed by high Spearman's correlations and significance (P < 0.0001). The path analysis showed low collinearity (42.60) between NDVI, LAI, and height; the high determination coefficient (R²) with values of 0.8421 and 0.7767 demonstrated their associations with TFB and GLB, respectively. Among the studied models to predict TFB and GLB, only exponentials using NDVI and power using LAI and height showed the best fit. In the validation stage, the models related to height exhibited the highest performance with 0.9531 (TFB) and 0.9638 (GLB) d-index, -2.3 (TFB) and -7.20 (GLB) bias, and 0.8532 (TFB) and 0.8932 (GLB) R². Only nonlinear models using height (cm) to predict TFB and GLB had the best practical application potential, thus ensuring efficiency in data collection.

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Crop photosynthetic response to light quality and light intensity

Cited by 106 publications

References 219 publications

Low Light Alters the Photosynthesis Process in Cigar Tobacco via Modulation of the Chlorophyll Content, Chlorophyll Fluorescence, and Gene Expression

Low Light Alters the Photosynthesis Process in Cigar Tobacco via Modulation of the Chlorophyll Content, Chlorophyll Fluorescence, and Gene Expression

Characterization of Brachiaria decumbens ‘Basilisk’ pasture subjected to flexible grazing by sheep

Prediction of Brachiaria decumbens forage biomass using structural characteristics

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Crop photosynthetic response to light quality and light intensity

Cited by 106 publications

References 219 publications

Low Light Alters the Photosynthesis Process in Cigar Tobacco via Modulation of the Chlorophyll Content, Chlorophyll Fluorescence, and Gene Expression

Low Light Alters the Photosynthesis Process in Cigar Tobacco via Modulation of the Chlorophyll Content, Chlorophyll Fluorescence, and Gene Expression

Characterization of Brachiaria decumbens &#8216;Basilisk&#8217; pasture subjected to flexible grazing by sheep

Prediction of Brachiaria decumbens forage biomass using structural characteristics

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Characterization of Brachiaria decumbens ‘Basilisk’ pasture subjected to flexible grazing by sheep