Estimating photosynthetic electron transport via chlorophyll fluorometry without Photosystem II light saturation View Full Text


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Article Info

DATE

2004-11

AUTHORS

Hugh J Earl, Said Ennahli

ABSTRACT

Estimates of thylakoid electron transport rates (J(e)) from chlorophyll fluorometry are often used in combination with leaf gas exchange measurements to provide detailed information about photosynthetic activity of leaves in situ. Estimating J(e) requires accurate determination of the quantum efficiency of Photosystem II (Phi(P)), which in turn requires momentary light saturation of the Photosystem II light harvesting complex to induce the maximum fluorescence signal (F(M)'). In practice, full saturation is often difficult to achieve, especially when incident photosynthetic photon flux density (Q) is high and energy is effectively dissipated by non-photochemical quenching. In the present work, a method for estimating the true F(M)' under high Q was developed, using multiple light pulses of varying intensity (Q'). The form of the expected relationship between the apparent F(M)' and Q' was derived from theoretical considerations. This allowed the true F(M)' at infinite Q' to be estimated from linear regression. Using a commercially available leaf gas exchange/ chlorophyll fluorescence measurement system, J(e) was compared to gross photosynthetic CO(2) assimilation (A(G)) under conditions where the relationship between J(e) and A(G) was expected to be linear. Both in C(4) leaves (Zea mays) in ambient air and also in C(3) leaves (Gossypium hirsutum) under non-photorespiratory conditions the apparent ratio between J(e) and A(G) declined at high Q when Phi(P) was calculated from F(M)' measured simply using the highest available saturating pulse intensity. When F(M)' was determined using the multiple pulse / linear regression technique, the expected relationship between J(e) and A(G) at high Q was restored, indicating that the Phi(P) estimate was improved. This method of determining F(M)' should prove useful for verifying when saturating pulse intensities are sufficient, and for accurately determining Phi(P) when they are not. More... »

PAGES

177-186

References to SciGraph publications

  • 1986-01. Continuous recording of photochemical and non-photochemical chlorophyll fluorescence quenching with a new type of modulation fluorometer in PHOTOSYNTHESIS RESEARCH
  • 1990. Measurement of Photochemical and Non-photochemical quenching: Correction for turnover of PS2 during steady-state photosynthesis in CURRENT RESEARCH IN PHOTOSYNTHESIS
  • 1999-11. Technique of the Modulated Chlorophyll Fluorescence: Basic Concepts, Useful Parameters, and Some Applications in PHOTOSYNTHETICA
  • 1996-07. Analysis of inhibition of photosynthesis due to water stress in the C3 species Hordeum vulgare and Vicia faba: Electron transport, CO2 fixation and carboxylation capacity in PHOTOSYNTHESIS RESEARCH
  • 1998-12. Relationship between thylakoid electron transport and photosynthetic CO2 uptake in leaves of three maize (Zea mays L.) hybrids in PHOTOSYNTHESIS RESEARCH
  • 1993-03. Light dependence of quantum yields of Photosystem II and CO2 fixation in C3 and C4 plants in PHOTOSYNTHESIS RESEARCH
  • 1990-09. The relationship between CO2 assimilation and electron transport in leaves in PHOTOSYNTHESIS RESEARCH
  • 1996-09. Xanthophyll cycle and light stress in nature: uniform response to excess direct sunlight among higher plant species in PLANTA
  • 1993-08. Can CO2 assimilation in maize leaves be predicted accurately from chlorophyll fluorescence analysis? in PHOTOSYNTHESIS RESEARCH
  • 1994-09. Measurements of mesophyll conductance, photosynthetic electron transport and alternative electron sinks of field grown wheat leaves in PHOTOSYNTHESIS RESEARCH
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    URI

    http://scigraph.springernature.com/pub.10.1007/s11120-004-1454-3

    DOI

    http://dx.doi.org/10.1007/s11120-004-1454-3

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1018799029

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/16151873


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