کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2015767 | 1541938 | 2014 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effective light absorption and absolute electron transport rates in the coral Pocillopora damicornis
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کلمات کلیدی
ETRNPQFRRfSpectral attenuationLight absorption - جذب نورNon-photochemical quenching - خنک سازی غیر فتوشیمیاییFast repetition rate fluorometry - سرعت تکرار سریع فلورومتریChlorophyll fluorescence - فلورسانس کلروفیلCoral - مرجان دریاییElectron transport rate - نرخ انتقال الکترونactinic light - نور فعال
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Pulse Amplitude Modulation (PAM) fluorometry has been widely used to estimate the relative photosynthetic efficiency of corals. However, both the optical properties of intact corals as well as past technical constrains to PAM fluorometers have prevented calculations of the electron turnover rate of PSII. We used a new Multi-colour PAM (MC-PAM) in parallel with light microsensors to determine for the first time the wavelength-specific effective absorption cross-section of PSII photochemistry, ÏII(λ), and thus PAM-based absolute electron transport rates of the coral photosymbiont Symbiodinium both in culture and in hospite in the coral Pocillopora damicornis. In both cases, ÏII of Symbiodinium was highest in the blue spectral region and showed a progressive decrease towards red wavelengths. Absolute values for ÏII at 440 nm were up to 1.5-times higher in culture than in hospite. Scalar irradiance within the living coral tissue was reduced by 20% in the blue when compared to the incident downwelling irradiance. Absolute electron transport rates of P. damicornis at 440 nm revealed a maximum PSII turnover rate of ca. 250 electrons PSIIâ1 sâ1, consistent with one PSII turnover for every 4 photons absorbed by PSII; this likely reflects the limiting steps in electron transfer between PSII and PSI. Our results show that optical properties of the coral host strongly affect light use efficiency of Symbiodinium. Therefore, relative electron transport rates do not reflect the productivity rates (or indeed how the photosynthesis-light response is parameterised). Here we provide a non-invasive approach to estimate absolute electron transport rates in corals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Physiology and Biochemistry - Volume 83, October 2014, Pages 159-167
Journal: Plant Physiology and Biochemistry - Volume 83, October 2014, Pages 159-167
نویسندگان
Milán Szabó, Daniel Wangpraseurt, Bojan Tamburic, Anthony W.D. Larkum, Ulrich Schreiber, David J. Suggett, Michael Kühl, Peter J. Ralph,