Using Chlorophyll Fluorescence and Vegetation Indices to Predict the Timing of Nitrogen Demand in Pentas lanceolata

Wu, Chun-Wei; Lin, Kuan–Hung; Lee, Ming‐Chih; Peng, Yung-Liang; Chou, Ting-Yi; Chang, Yu‐Sen

doi:10.7235/hort.2015.15043

Cited by 13 publications

(10 citation statements)

References 36 publications

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“…As shown in Figure 2 , predawn Fv/Fm values showed no significant differences (close to 0.8) between DG and LG leaves in either species. Under suitable growth conditions, a plant’s Fv/Fm value is around 0.83, but this value may be strongly depressed after exposure to stresses, which precipitates suppression of the electron transfer chain [ 29 ]. This index indicates the photosynthetic potential and the potential for photochemical dissipation, and it shows the PSII percentage that is open and also the effectiveness of capturing photo energy from light-harvesting complexes and subsequent quantum transfer.…”

Section: Resultsmentioning

confidence: 99%

Biochemical and Physiological Characteristics of Photosynthesis in Plants of Two Calathea Species

Nguyen

Lin

Hsiung

et al. 2018

IJMS

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Plants of the genus Calathea possess many leaf colors, and they are economically important because they are widely used as ornamentals for interior landscaping. Physiological performances and photosynthetic capacities of C. insignis and C. makoyana were investigated. The photosynthetic efficiencies of C. insignis and C. makoyana were significantly increased when the photosynthetic photon flux density (PPFD) increased from 0 to 600 μmol photons·m−2·s−1 and became saturated with a further increase in the PPFD. The two Calathea species had lower values of both the light saturation point and maximal photosynthetic rate, which indicated that they are shade plants. No significant differences in predawn Fv/Fm values (close to 0.8) were observed between dark-green (DG) and light-green (LG) leaf sectors in all tested leaves. However, the effective quantum yield of photosystem II largely decreased as the PPFD increased. An increase in the apparent photosynthetic electron transport rate was observed in both species to a maximum at 600 μmol·m−2·s−1 PPFD, following by a decrease to 1500 μmol·m−2·s−1 PPFD. Compared to LG leaf extracts, DG leaf extracts contained higher levels of chlorophyll (Chl) a, Chl b, Chls a + b, carotenoids (Cars), anthocyanins (Ants), flavonoids (Flas), and polyphenols (PPs) in all plants, except for the Ant, Fla and PP contents of C. insignis plants. Calathea insignis also contained significantly higher levels of total protein than did C. makoyana. The adjusted normalized difference vegetation index (NDVI), photochemical reflectance index (PRI), red-green, and flavonol index (FlavI) were significantly correlated to leaf Chls a + b, Cars, Ants, and Flas in C. makoyana, respectively, and can be used as indicators to characterize the physiology of these plants.

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Section: Resultsmentioning

confidence: 99%

Biochemical and Physiological Characteristics of Photosynthesis in Plants of Two Calathea Species

Nguyen

Lin

Hsiung

et al. 2018

IJMS

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“…The lower ∆F/Fm' (Fv/Fm) levels (<60%) obtained at 800~2000 PPFD (Figure 2I,J) indicate that there is long-term photoinhibition and that a higher light intensity at 800~2000 PPFD is still suitable for the growth of these plants regardless of season and tillage practice. ∆F/Fm' (Fv/Fm) may be strongly depressed after exposure to higher irradiations, which precipitates suppression of the electron transfer chain [40]. ∆F/Fm' (Fv/Fm) also reflects photosynthetic potential as well as the potential for photochemical dissipation.…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic Physiology Comparisons between No Tillage and Sod Culture of Citrus Farming in Different Seasons under Various Light Intensities

et al. 2021

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Sod culture (SC) and no tillage (NT) are modern orchard management systems, and are two different bases for the sustainable development and production of citrus orchards in Taiwan. However, there is no information about the efficiency of either NT or SC on the photosynthetic physiology of farmed citrus under different seasons and varying light intensities. The objective of this study was to clarify the impacts of SC and NT under eco-friendly farming management on the photosynthetic apparatus of an important plantation citrus species in response to varying light intensities over the seasons. The results showed that Rd (dark respiration rate of CO2), Qy (light quantum yield of CO2), LCP (light compensation point), Amax (maximum net assimilation of CO2), and Fv/Fm values of citrus plants under SC were somewhat higher under NT in the same season, particularly in the fall and in winter. As light intensity increased from 200 to 2000 μmol photon m−2 s−1 PPFD, higher Pn (net photosynthesis rate), Gs (stomatal conductance), ETR (electron transport rate), NPQ (non-photochemical quenching), and Fv/Fm (potential quantum efficiency of PSII) values were observed in spring and summer compared to the fall and winter, and increasing NPQ and decreasing Fv/Fm values were observed in all seasons. Positive and significant correlations were shown between the Pn and Gs under NT and SC in all seasons with all light illuminations, whereas significant and negative relationships were observed between the ETR and NPQ under NT in fall and winter at 1200~2000 PPFD. In short, ETR was useful for non-destructive estimations of Pn and NPQ since these indices were significantly and positively correlated with ETR in citrus leaves exposed to 0~1200 PPFD in all seasons and 1200~2000 PPFD in spring, the fall, and winter, providing a quick means to identify the physiological condition of plants under various seasons and tillages. The precise management of photosynthetic parameters such as ETR in response to light irradiances under varied seasons also provides implications for sustainable citrus production for tillage cropping systems in future higher CO2 and potentially wetter or drier environments. The tillages may hold promise for maximizing the economic efficiency of the growth and development of citrus plants grown in the field.

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“…The Fv/Fm reduction indicates that an important portion of the photosynthesis system II (PSII) reaction center was damaged, as the Fv/Fm value in healthy leaves is 0.83 ± 0.04, which is a typical value for uninhibited plants. This value may be strongly depressed after exposure to a stress, which precipitates the suppression of the electron transfer chain (Wu et al, 2015). A lower value indicates that some proportion of the PSII reaction centers are damaged, which is often observed in plants under conditions of stress (Camejo et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…For example, the adjusted normalized difference vegetation index (NDVI) has been linked to photosynthetic light-use efficiency (Ballester et al, 2018). Previously, we found that leaf Soil Plant Analysis Development (SPAD), NDVI, and Fv/Fm indices are accurate proxies of leaf nitrogen concentration and can be used as non-destructive estimations of the proper timing for N-solution irrigation of Pentas lanceolata (Wu et al, 2015). Hence, these spectral reflectance indices might be useful for measuring leaf pigments and secondary metabolites when developing indices for nondestructive estimations, and we attempted to determine whether these indices could be used on Perilla plants as sensitive metrics for estimating leaf ChlF corresponding to antioxidant activities under various fertilizer and SA treatments.…”

Section: Introductionmentioning

confidence: 99%

Influence of fertilizer and salicylic acid treatments on growth, physiological, and antioxidant characteristics in green and red Perilla frutescens varieties

Y.-J

K.-H

C.-W

et al. 2021

Not Bot Horti Agrobo

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Perilla is herbaceous plant, functional food, and nutraceutical product with antioxidant properties. The objective of this study was to investigate the growth, reflectance indices, and antioxidant properties of P. frutescens species in response to fertilizer and salicylic acid (SA) applications. Two independent experiments were carried out in an environmentally controlled greenhouse: (1) pots of red-leaf and green-leaf cultivars divided into four groups treated with 10-30-20 (10N-13.1P-16.6K), 15-10-30 (15N-4.4P-24.9K), 20-20-20 (20N-8.7P-16.6K), and 30-10-10 (30N-4.4P-8.3K) fertilizers for periods of 10 weeks, and (2) pots of red and green Perilla cultivars divided into five groups treated with 0 (control), 125, 250, 500, and 1,000 µM of SA for periods of 7 weeks. Wide variations occurred in the agronomic performance, soil-plant analysis development (SPAD) value, adjusted normalized difference vegetation index (NDVI), maximal quantum yield of PSII photochemistry (Fv/Fm), and antioxidant activity of the two Perilla varieties. All the measured traits were higher in green than in red Perilla under identical fertilizing, and all agronomic traits in green and red Perilla plants subjected to 125 and 500 μM SA were better than in controls. The SPAD and NDVI values of all plants increased as N% increased, the lowest Fv/Fm values of all plants were observed under 15-10-30 fertilizer treatment, the lowest NDVI values were detected in controls, and the Fv/Fm values of all plants decreased under 1,000 μM SA treatment. These indices can be used as indicators to characterize the physiology of these plants and are suitable for evaluating their growth and development under specific fertilizer and SA treatments. Green Perilla leaf extract (PLE) contained higher rosmarinic acid (RA) concentration in each fertilizer treatment, and higher total phenolic (TP) and RA concentration in each SA treatment. However, red PLE contained higher caffeic acid (CA) concentration than green PLE in each fertilizer and SA treatment, implying that their two genotypes exhibited different abilities and specificities of photosynthetic metabolites, and that different varieties may prepare for 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity by up-regulating TP, RA, and CA concentration differently. Thus, Perilla plants can be used as health foods due to high TP, RA, and CA concentration. To produce Perilla efficiently in industrial applications, we undertook to determine the optimum N-P-K fertilizer ratio and SA application for maximizing the growth and accumulation of TP, RA, and CA in Perilla plants.

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Using Chlorophyll Fluorescence and Vegetation Indices to Predict the Timing of Nitrogen Demand in Pentas lanceolata

Cited by 13 publications

References 36 publications

Biochemical and Physiological Characteristics of Photosynthesis in Plants of Two Calathea Species

Biochemical and Physiological Characteristics of Photosynthesis in Plants of Two Calathea Species

Photosynthetic Physiology Comparisons between No Tillage and Sod Culture of Citrus Farming in Different Seasons under Various Light Intensities

Influence of fertilizer and salicylic acid treatments on growth, physiological, and antioxidant characteristics in green and red Perilla frutescens varieties

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