Spectral reflectance indices and pigment functions during leaf ontogenesis in six subtropical landscape plants |
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Authors: | Nan Liu Zhi-Fang Lin Anna Van Devender Gui-Zhu Lin Chang-Lian Peng Xiao-Ping Pan Shao-Wei Chen Qun Gu |
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Institution: | (1) Guangdong Key Laboratory of Digital Botanical Garden, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China;(2) College of Life Sciences, MOE Key Laboratory of Laser Life Science, South China Normal University, Guangzhou, 510631, China;(3) School of Natural Resources, College of Agriculture and Life Sciences, University of Arizona, Tucson, AZ 85721, USA;(4) Zeal Quest Scientific Technology Co. Ltd., Shanghai, 200333, China |
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Abstract: | 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 ΦPSII (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), ΦPSII 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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Keywords: | Anthocyanin Carotenoid Chlorophyll Fluorescence Reflectance spectrum Leaf development |
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