The Effect of Light Exposure on the Total Chlorophyll Content, Chl a/b Ratio, and Car/chl Ratio in the Barks of Fraxinus latifolia Seedlings

Tran, Trang T.

doi:10.15760/honors.583

Cited by 6 publications

(10 citation statements)

References 19 publications

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“…The response was also growth-stage dependent and the concentration was more at 6 compared to 3 WAS. This result was consistent with the finding of Tran (2018), where 100% light exposure treatment gave the highest chlorophyll content. In another report, lightenhanced chlorophyll formation was found to occur under illumination compared to darkness and the longer the duration of illumination, the greater the enhancement of chlorophyll formation (Zhang et al, 2016).…”

Section: Discussionsupporting

confidence: 93%

Physiological responses of cowpea simultaneously exposed to water deficit stress and varying light intensities at vegetative and reproductive growth stages

Olatunbosun

Adejumo

Fofana

et al. 2022

JPSP

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A combination of stresses as it occurs on the field poses more challenges to crop production than individual stress. Crops’ response to single stress also differs from that of combined stresses. The morpho-physiological responses of two cowpea varieties (IT89KD-288 and IT99K573-1-1) to a combination of stresses (water deficit stress and high light intensity) were investigated at different growth stages. Three levels of light intensities (L3: 259 Lux- 36%, L2: 394 Lux-55% and L1: 710.2 Lux-100%) were imposed using one, two and zero layer(s) of the net, respectively, while, water deficit stress at four levels (W1: no water stress; 0-5 bars, W2: moderate water stress; 5-15 bars, W3: moderately-severe; 15-40 bars and W4: severe water stress; 40 -70 bars) was imposed differently at vegetative and reproductive growth stages. Data were collected on the cowpea yield, Leaf Temperature (LT), Chlorophyll (C), Photosynthesis (P), Stomatal Conductance (SC) and Canopy Transpiration Rate (CTR). Exposure to W4 under L1 considerably reduced cowpea yield by 80% compared to those grown under L3 and full watering. Reduced light intensity enhanced cowpea grain yield irrespective of water deficit stress and IT89KD-288 was superior to IT99K573-1-1. Reduction in light intensity also increased the SC from 55.18 in L1 to 76.88 in 36 % L3. Full light intensity without water stress (100% light intensity), increased C content, while severe water stress reduced the C content and CTR. Photosynthesis was, however, reduced under low light intensity compared to 100% light intensity. It was also observed that water deficit stress imposed at the reproductive stage did not affect P, CTR and SC unlike that of the vegetative stage. In conclusion, reduced light intensity enhanced cowpea tolerance to water deficit and increased yield. Cowpea response was dependent on growth stage, variety and severity of stress.

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Section: Discussionsupporting

confidence: 93%

Physiological responses of cowpea simultaneously exposed to water deficit stress and varying light intensities at vegetative and reproductive growth stages

Olatunbosun

Adejumo

Fofana

et al. 2022

JPSP

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“…The chlorophyll content is also affected by shade; again, 40% shade covering seems not to have that much of an affect. This result partly agreed with the observations of Kramer and Kozlowski [72] and Tran [73], which affirm that the leaf chlorophyll content is lower in shaded plants compared to non-shaded plants. According to Jiang [74] and Yue et al [75], there is a positive correlation between chlorophyll content and photosynthesis and growth in terms of biomass production.…”

Section: Effect Of Shadesupporting

confidence: 91%

Effect of Shading, Substrate, and Container Size on Argania spinosa Growth and Cost–Benefit Analysis

Oumahmoud,

Alouani,

Elame

et al. 2023

Agronomy

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The production of argan seedlings in nurseries is considered a crucial step for the success of any argan forest regeneration program since it increases the rate of survival and growth. Therefore, the substrate and container play a vital role in argan seedling production, while the use of shade may improve soil moisture and decrease the water stress of the plant. This study aims to determine the effects of these factors and their interactions. For this, the effects of four shade levels (0%, 20%, 40%, and 80%) and six different compositions of the substrate, as well as four different sizes and forms of containers, on argan seedling production were studied for six months under greenhouse conditions, based on analyzing the leaf mineral elements and measuring morphological traits. According to the studied parameters, the results show that 0% and 40% of shade are, respectively, the best shade levels for growth, while the germination rate is higher only in an unshaded compartment (85.28%). Furthermore, the substrate based on peat moss lead to one of the higher germination rates (78.75%) and the finest plants in terms of chlorophyll content, and shoot and root growth, while the largest container (C2) had the best shoot and root growth with 34.34 cm of root length. However, the mineral analysis, mainly the leaf total nitrogen concentration, is correlated with morphological traits. In addition, the cost–benefit analysis study confirmed this finding and valorizes the use of S1 substrate (1/2 black peat and 1/2 blond peat) and a C2 container (volume: 3100 mL) since it is considered the most efficient and economic combination for different shade levels.

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“…A high correlation of the Car vs. TCC was found when excluding sampling sites A and E (R 2 : 0.9919, p < 0.0001). The Car/TCC ratio is related to the greenness of the leaves and along with the Chl-a/Chl-b ratio, they are very good markers of the adaptation of chloroplasts to light conditions [77][78][79]. According to these studies, a low Car/TCC ratio in samples in low light conditions would be characteristic of shade chloroplast.…”

Section: Biochemical Analysismentioning

confidence: 98%

“…According to these studies, a low Car/TCC ratio in samples in low light conditions would be characteristic of shade chloroplast. As such, shade chloroplasts typically show lower Car/TCC ratios because under low light conditions Carotenoids and Xanthophyll cycles are downregulated and the Total Chlorophyll Content increases [79,80]. The TPC, TFC, and DPPH radical scavenging activity values of each site are shown in Figure 3.…”

Section: Biochemical Analysismentioning

confidence: 99%

Quantifying Biochemical Traits over the Patagonian Sub-Antarctic Forests and Their Relation to Multispectral Vegetation Indices

et al. 2021

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The effects and consequences of global warming on the productivity of the Patagonian forest are still unknown. The use of Unmanned Aerial Vehicles (UAV) promotes new knowledge of the most pristine and unknown sub-antarctic forests located in Chilean Patagonia. This work presents an initial approach to spatialize biochemicals over the Patagonian forests using ultra-high spatial resolution imagery acquired from UAVs equipped with a multispectral (visible, near-infrared, and thermal) sensor. The images were obtained in multiple flights over the Cerro Castillo National Park (Aysén Region, Chile), and several Vegetation Indices (VIs) were estimated. Leaves of Nothofagus pumilio (Poepp. et Endl.) Krasser (Nothofagaceae) individuals were extracted after the flights and were then used to determine the biochemicals traits of chlorophylls (Chl-a and Chl-b) and carotenoids pigments, as well as the total phenolic content (TPC), total flavonoids content (TFC), and the DPPH radical scavenging assay. Their relationships with multiple VIs was analyzed in order to assess the spatiality of the biochemicals traits in the forest during it most productive phenological stage. Results showed high correlations for the biochemical traits pigments (R2 > 0.75) with the indices DVI, MCARI, and MSAVI1 as the best performing indices, while further spectral availability is needed for significant correlations with biochemicals traits related to the antioxidant capacity. Spatialization of the biochemical traits within UAV imagery was also performed evaluating their representation in the forest. This work allowed us to identify the different spectral behavior of the N. pumilio species, its relation to biochemical traits, and their spatialization, thus presenting the first step to developing a monitoring protocol for the evaluation of the Patagonian forests under the current global warming scenarios in the region.

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The Effect of Light Exposure on the Total Chlorophyll Content, Chl a/b Ratio, and Car/chl Ratio in the Barks of Fraxinus latifolia Seedlings

Abstract: The purpose of this study is to determine the effect of light exposure on the total chlorophyll content, the chl a/b ratio, and the car/chl ratio and thus the shade tolerance of Fraxinus latifolia .

Cited by 6 publications

References 19 publications

Physiological responses of cowpea simultaneously exposed to water deficit stress and varying light intensities at vegetative and reproductive growth stages

Physiological responses of cowpea simultaneously exposed to water deficit stress and varying light intensities at vegetative and reproductive growth stages

Effect of Shading, Substrate, and Container Size on Argania spinosa Growth and Cost–Benefit Analysis

Quantifying Biochemical Traits over the Patagonian Sub-Antarctic Forests and Their Relation to Multispectral Vegetation Indices

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