Assessment of Photosynthetic Pigment and Water Contents in Intact Sunflower Plants from Spectral Indices

Neto, Antônio José Steidle; Lopes, Daniela de Carvalho; Júnior, João C. F. Borges

doi:10.3390/agriculture7020008

Cited by 35 publications

(3 citation statements)

References 34 publications

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“…As demonstrated by Peñuelas and Inoue 32 , when evaluating reflectance indices associated with water and pigment contents of peanut and wheat leaves, WI closely track changes in LRWC, but it is frequently influenced by architectural canopy parameters. Similar results were obtained by Steidle Neto et al 50 , when assessing water and chlorophyll contents from spectral indices in sunflower plants under drought conditions. WI is effective to represent changes also in sunflower water content.…”

Section: Resultssupporting

confidence: 88%

Effects of water stress on spectral reflectance of bermudagrass

Caturegli

Matteoli

Gaetani

et al. 2020

Sci Rep

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In the south-central Italy, during summer rainfall does not supply a sufficient amount of water. Therefore, irrigation management during dry periods is important for maintaining turf quality. The hybrid bermudagrass (Cynodon dactylon (L.) Pers. × Cynodon transvaalensis Burtt–Davy) is known to represent the dominant warm-season turfgrass in warm to temperate climatic regions and its drought tolerance make bermudagrass a competitive turfgrass. A greenhouse experiment was conducted using uniform cores of hybrid bermudagrass, which were secured in a polyvinyl chloride cylinders and watered by constant sub-irrigation. The objectives of the present research were to measure the spectral reflectance with a new generation handheld spectroradiometer on hybrid bermudagrass and to explore various vegetation indices to be used as future detecting tool to study water stress in bermudagrass. Moreover, the potential uses of multivariate processing techniques for discriminating different water stress conditions in turfgrass has been investigated. Besides spectral indices, multivariate methods, although performed on a data set limited in terms of sample size, have shown a great potential for water stress monitoring in turfgrass and surely deserve further investigations. There are different indices that use distinct water absorption features independent of chlorophyll concentration, such as water index (WI = R900/R970) that has been reported to be a robust index of canopy water content and is used as an active indicator of changes in Leaf Relative Water Content (LRWC). Also, the ratio of WI with NDVI (WI/NDVI = (R900/R970)/((R800 − R680)/(R800 + R680)]) was found to be an effective indicator of water stress. Another vegetation index to detect water features is normalized difference water index (NDWI), designed to maximize reflectance of water by using green wavelengths. In our trial in bermudagrass the relationships studied, suggest that WI (900/970) and WI/NDVI, among the indices studied, are the more effective indicators of water stress. In fact, lower values of WI indicate higher water stress, while higher values of WI/NDVI indicate higher water stress levels.

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Section: Resultssupporting

confidence: 88%

Effects of water stress on spectral reflectance of bermudagrass

Caturegli

Matteoli

Gaetani

et al. 2020

Sci Rep

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“…The relative greenness decreased due to stress and average decline of -3.88rg was noted under stress environment (Table 7). Present findings are in consonance with those of Antonio et al (2017) who perceived that water stress induced a decline in the chlorophyll contents, resulting in linear and nonlinear decreases in chlorophyll content index also.…”

Section: Chlorophyll Content (Relative Greenness Rg)supporting

confidence: 92%

Evaluation of Sunflower Genotypes for Yield and Quality Parameters under Well-Water Stressed and Non Water Stressesd Environment

Kaleri

Jatoi²,

Baloch³

et al. 2023

Egypt. J. Agron.

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Egyptian Journal of Agronomy http://agro.journals.ekb.eg/ 4 stressed conditions and may be selected for both the environments simultaneously For different characters, female inbreds viz. Ho.1, Mehran and Thatta whereas from male parents UC-666 and B-2 recorded high performance early maturity, seed yield, oil and protein% in both the environments. Therefore such male and female inbreds may be involved in breeding programmes to develop potential breeding material with improved agronomic, oil and protein characters.

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“…Developments in hyperspectral RS have provided new VIs or indicators of plant biochemical and biophysical properties. Most of the studies involving the novel spectral VIs have been conducted at the leaf or canopy level and often are focused on mitigating unwanted reflectance effects, while increasing the indices' sensitivity to the investigated parameters [6,7].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Hyperspectral Vegetation Indices for Remote Estimation of Leaf Chlorophyll Content and Plant Status

Velichkova¹,

Krezhova²

2019

RadJ

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Leaf chlorophyll (Chl) content, at the leaf and canopy level, is an important biochemical parameter because of its crucial role in photosynthesis and in plant functioning. Furthermore, it provides an indication of the plant nutritional state and stress. Due to the reliable, rapid, and non-destructive advantages, hyperspectral remote sensing plays a significant role in monitoring and assessing the plant biophysical variables. In this study, a set of Chlrelated vegetation indices (VIs) derived from the leaf reflectance data of young pepper plants infected by Cucumber Mosaic Virus (CMV) were tested for estimating the changes in the Chl content and plant status. Hyperspectral reflectance data were collected by means of a portable fiber-optics spectrometer in the spectral range of 350-1100 nm. The effect of two growth regulators, MEIA (beta-monomethyl ester of itaconic acid) and ВТН (benzo(1,2,3)thiadiazole-7-carbothioic acid-S-methyl ester), on the Chl content and respectively on the development of the viral infection was investigated too. Four categories VIs: normalized difference (ND) VIs; simple ratio (SR) VIs; single-band reflectance or simple difference (SD) VIs, and some other forms of VIs, were tested using statistical analyses (ANOVA and Tukey-Kramer's tests) to explore their potentials in the Chl content estimation. To enhance the sensitivity of the VIs, modified VIs were tested in some other combinations of narrow bands. The statistical analyses showed that the Modified Red Edge Simple Ratio (MRESR) index, Vogelmann Red Edge index (VREI1), and Pigment index (PI) were most sensitive to the Chl content changes. The Normalized Difference VI (NDVI) and Triangular Vegetation Index (TVI) turned out to be insensitive to Chl variations. The rest of the VIs were responsible for Chl variations but with less sensitivity.

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Assessment of Photosynthetic Pigment and Water Contents in Intact Sunflower Plants from Spectral Indices

Cited by 35 publications

References 34 publications

Effects of water stress on spectral reflectance of bermudagrass

Effects of water stress on spectral reflectance of bermudagrass

Evaluation of Sunflower Genotypes for Yield and Quality Parameters under Well-Water Stressed and Non Water Stressesd Environment

Comparative Analysis of Hyperspectral Vegetation Indices for Remote Estimation of Leaf Chlorophyll Content and Plant Status

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