Radiation Use Efficiency, Chlorophyll Fluorescence, and Reflectance Indices Associated with Ontogenic Changes in Water-Limited Chenopodium quinoa Leaves

Winkel, Thierry; Méthy, M.; Thénot, F.

doi:10.1023/a:1021345724248

Cited by 51 publications

(33 citation statements)

References 35 publications

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“…These findings are similar to studies focused on water stress, which have shown positive relationships between PRI and fluorescence (Peñuelas et al 1998;Winkel et al 2002). During the same 2007 field season, Naumann et al (2008b) showed that M. cerifera experienced a drought response, as seen in decreases in stomatal conductance, photosynthesis, and RWC relative to earlier in the season.…”

Section: Discussionsupporting

confidence: 84%

Spatial variations in salinity stress across a coastal landscape using vegetation indices derived from hyperspectral imagery

Naumann

Young

Anderson³

2008

Plant Ecol

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Chlorophyll fluorescence and landscapelevel reflectance imagery were used to evaluate spatial variations in stress in Myrica cerifera and Iva frutescens during a severe drought and compared to an extremely wet year. Measurements of relative water content and the water band index (WBI 970 ) indicated that the water stress did not vary across the island. In contrast, there were significant differences in tissue chlorides across sites for both species. Using the physiological reflectance index (PRI), we were able to detect salinity stress across the landscape. For M. cerifera, PRI did not differ between wet and dry years, while for I. frutescens, there were differences in PRI during the 2 years, possibly related to flooding during the wet year. There was a positive relationship between PRI and DF=F 0 m for M. cerifera (r 2 = 0.79) and I. frutescens (r 2 = 0.72). The normalized difference vegetation index (NDVI), the chlorophyll index (CI), and WBI 970 were higher during the wet summer for M. cerifera, but varied little across the island. CI and WBI 970 were higher during 2004 for I. frutescens, while there were no differences in NDVI during the 2 years. PRI was not significantly related to NDVI, suggesting that the indices are spatially independent. These results suggest that PRI may be used for early identification of salt stress that may lead to changes in plant distributions at the landscape level, as a result of rising sea level. Comparsions between the two species indicate that variations in PRI and other indices may be species specific.

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Section: Discussionsupporting

confidence: 84%

Spatial variations in salinity stress across a coastal landscape using vegetation indices derived from hyperspectral imagery

Naumann

Young

Anderson³

2008

Plant Ecol

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“…Photochemical reflectance index, the PRI, has been demonstrated to be related to light use efficiency (Winkel et al 2002). For all species but M. indica, PRI values were highest in mature leaves but lowest in juvenile or senescent ones.…”

Section: Spectral Reflectancementioning

confidence: 99%

“…R 705 ) (Gitelson and Merzlyak 1994); Structuralindependent pigment index (SIPI) as (R 800 -R 445 )/ (R 800 -R 680 ) (Peñuelas and Filella 1998); Anthocyanin reflectance index (ARI) as 1/R 550 -1/R 700 (Gitelson et al 2003); and Photochemical reflectance index (PRI) as (R 530 -R 570 )/(R 530 ? R 570 ) (Winkel et al 2002). Where R is reflectance, the subscript number of R represents a specific wavelength.…”

Section: Spectral Reflectance Of Leaf Upper Surfacementioning

confidence: 99%

Spectral reflectance indices and pigment functions during leaf ontogenesis in six subtropical landscape plants

et al. 2008

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Pigment combinations are regulated during leaf ontogenesis. To better understand pigment function, alterations in chlorophyll, carotenoid and anthocyanin concentrations were investigated during different leaf development stages in six subtropical landscape plants, namely Ixora chinensis Lam, Camellia japonica Linn, Eugenia oleina Wight, Mangifera indica L., Osmanthus fragrans Lowr and Saraca dives Pierre. High concentrations of anthocyanin were associated with reduced chlorophyll in juvenile leaves. As leaves developed, the photosynthetic pigments (chlorophyll and carotenoid) of all six species increased while anthocyanin concentration declined.Chlorophyll fluorescence imaging of U PSII (effective quantum yield of PSII) and of NPQ (non-photochemical fluorescence quenching) and determination of electron transport rate-rapid light curve (RLC) showed that maximum ETR (leaf electron transport rate), U PSII and the saturation point in RLC increased during leaf development but declined as they aged. Juvenile leaves displayed higher values of NPQ and Car/Chl ratios than leaves at other developmental stages. Leaf reflectance spectra (400-800 nm) were measured to provide an in vivo non-destructive assessment of pigments in leaves during ontogenesis. Four reflectance indices, related to pigment characters, were compared with data obtained quantitatively from biochemical analysis. The results showed that the ARI (anthocyanin reflectance index) was linearly correlated to anthocyanin concentration in juvenile leaves, while a positive correlation of Chl NDI (chlorophyll normalized difference vegetation index) to chlorophyll a concentration was species dependent. Photosynthetic reflectance index was not closely related to Car/Chl ratio, while a structural-independent pigment index was not greatly altered by leaf development or species. Accordingly, it is suggested that the high concentration of anthocyanin, higher NPQ and Car/Chl ratio in juvenile leaves are important functional responses to cope with high radiation when the photosynthetic apparatus is not fully developed. Another two leaf reflectance indices, ARI and Chl NDI, are valuable for in vivo pigment evaluation during leaf development.

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“…antheraxanthin or lower photosynthetic capacity were not associated with higher level of F v /F m in dry summer. It was also pointed out that PRI (Winkel et al 2002) or both photosynthesis and PRI (Richardson et al 2004) was more sensitive than F v /F m to water deficits. For the engagement of zeaxanthin ?…”

Section: Resultsmentioning

confidence: 99%

“…The relationships between PRI and photochemical efficiency and/or between PRI and net CO 2 uptake have been examined in many cases involving different seasons (Stylinski et al 2002;Nakaji et al 2006;Weng et al 2006a, b), elevations (Richardson et al 2001(Richardson et al , 2003Richardson and Berlyn 2002) and fertilizer regimes (Gamon et al 1992;Peñuelas et al 1994Peñuelas et al , 1995Gamon et al 2001). In addition, some reports also pointed out that PRI (Winkel et al 2002) or both photosynthesis and PRI (Richardson et al 2004) was more sensitive than F v /F m to water deficit.…”

Section: Introductionmentioning

confidence: 99%

Relationships of photosynthetic capacity to PSII efficiency and to photochemical reflectance index of Pinus taiwanensis through different seasons at high and low elevations of sub-tropical Taiwan

Weng

Lai

Liao

et al. 2008

Trees

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We investigated the relationships of photosynthetic capacity (P (nsat), near light-saturated net photosynthetic rate measured at 1,200 mu mol m(-2) s(-1) PPFD) to photosystem II efficiency (F (v)/F (m)) and to photochemical reflectance index [PRI = (R (531) - R (570))/(R (531) + R (570))] of Pinus taiwanensis Hay. needles at high (2,600 m a.s.l) and low-elevation (800 m a.s.l) sites through different seasons. Results indicate that at high-elevation site, P (nsat), F (v)/F (m) and PRI (both measured at predawn) paralleled in general with the air temperature. On the coolest measuring day with the minimum air temperature dropping to -2A degrees C, P (nsat) could decrease to ca. 15% of its highest value, which was measured in autumn. At low-elevation site, with the minimum air temperature of 10-12A degrees C in cooler season and almost no seasonal variation of F (v)/F (m), P (nsat) dropped to ca. 65% of its highest value and PRI decreased ca. 0.02 in winter. Even though seasonal variation of P (nsat) was affected by many factors, it was still closely related to PRI based on statistical analyses using data from both sites, through different seasons. On the contrary, seasonal variation of F (v)/F (m) of P. taiwanensis needles was influenced mainly by low temperature at high elevation. Therefore, the correlation of P (nsat) - F (v)/F (m) was lower than that of P (nsat) - PRI when data combined from both high- and low-elevation sites were analyzed. It is concluded that predawn PRI could be used as an indicator to estimate the seasonal potential of photosynthetic capacity of P. taiwanensis grown at low- and high-elevations of sub-tropical Taiwan

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Radiation Use Efficiency, Chlorophyll Fluorescence, and Reflectance Indices Associated with Ontogenic Changes in Water-Limited Chenopodium quinoa Leaves

Cited by 51 publications

References 35 publications

Spatial variations in salinity stress across a coastal landscape using vegetation indices derived from hyperspectral imagery

Spatial variations in salinity stress across a coastal landscape using vegetation indices derived from hyperspectral imagery

Spectral reflectance indices and pigment functions during leaf ontogenesis in six subtropical landscape plants

Relationships of photosynthetic capacity to PSII efficiency and to photochemical reflectance index of Pinus taiwanensis through different seasons at high and low elevations of sub-tropical Taiwan

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