Physiology of the seasonal relationship between Photochemical Reflectance Index and photosynthetic Light Use Efficiency

Albert Porcar-Castell, Jose Ignacio Garcia-Plazaola, Caroline Nichol, Pasi Kolari, Beñat Olascoaga Gracia, Nea Johanna Kuusinen, Beatriz Fernández-Marín, Minna Pulkkinen, Eija Juurola, Eero Nikinmaa

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

The Photochemical Reflectance Index (PRI) is regarded as a promising proxy to track the dynamics of photosynthetic Light Use Efficiency (LUE) via remote sensing. The implementation of this approach requires the relationship between PRI and LUE to scale not only in space but also in time. The short-term relationship between PRI and LUE is well known and is based on the regulative process of Non-Photochemical Quenching (NPQ) but at the seasonal timescale the mechanisms behind the relationship remain unclear. We examined to what extent sustained forms of NPQ, photoinhibition of reaction centres, seasonal changes in leaf pigment concentrations, or adjustments in the capacity of alternative energy sinks affect the seasonal relationship between PRI and LUE during the year in needles of boreal Scots pine. PRI and NPQ were highly correlated during most of the year but decoupled in early spring when the foliage was deeply downregulated. This phenomenon was attributed to differences in the physiological mechanisms controlling the seasonal dynamics of PRI and NPQ. Seasonal adjustments in the pool size of the xanthophyll-cycle pigments, on a chlorophyll basis, controlled the dynamics of PRI, whereas the xanthophyll de-epoxidation status and other xanthophyll-independent mechanisms controlled the dynamics of NPQ at the seasonal timescale. We conclude that the PRI leads to an underestimation of NPQ, and consequently overestimation of LUE, under conditions of severe stress in overwintering Scots pine, and most likely also in species experiencing severe drought. This severe stress-induced decoupling may challenge the implementation of the PRI approach.
Originalspråkengelska
TidskriftOecologia
Volym170
Utgåva2
Sidor (från-till)313-323
Antal sidor11
ISSN0029-8549
DOI
StatusPublicerad - 2012
MoE-publikationstypA1 Tidskriftsartikel-refererad

Vetenskapsgrenar

  • 1184 Genetik, utvecklingsbiologi, fysiologi
  • 4112 Skogsvetenskap

Citera det här

@article{449b619373f4409cb959fa59b2dfa1c8,
title = "Physiology of the seasonal relationship between Photochemical Reflectance Index and photosynthetic Light Use Efficiency",
abstract = "The Photochemical Reflectance Index (PRI) is regarded as a promising proxy to track the dynamics of photosynthetic Light Use Efficiency (LUE) via remote sensing. The implementation of this approach requires the relationship between PRI and LUE to scale not only in space but also in time. The short-term relationship between PRI and LUE is well known and is based on the regulative process of Non-Photochemical Quenching (NPQ) but at the seasonal timescale the mechanisms behind the relationship remain unclear. We examined to what extent sustained forms of NPQ, photoinhibition of reaction centres, seasonal changes in leaf pigment concentrations, or adjustments in the capacity of alternative energy sinks affect the seasonal relationship between PRI and LUE during the year in needles of boreal Scots pine. PRI and NPQ were highly correlated during most of the year but decoupled in early spring when the foliage was deeply downregulated. This phenomenon was attributed to differences in the physiological mechanisms controlling the seasonal dynamics of PRI and NPQ. Seasonal adjustments in the pool size of the xanthophyll-cycle pigments, on a chlorophyll basis, controlled the dynamics of PRI, whereas the xanthophyll de-epoxidation status and other xanthophyll-independent mechanisms controlled the dynamics of NPQ at the seasonal timescale. We conclude that the PRI leads to an underestimation of NPQ, and consequently overestimation of LUE, under conditions of severe stress in overwintering Scots pine, and most likely also in species experiencing severe drought. This severe stress-induced decoupling may challenge the implementation of the PRI approach.",
keywords = "1184 Genetics, developmental biology, physiology, 4112 Forestry",
author = "Albert Porcar-Castell and Garcia-Plazaola, {Jose Ignacio} and Caroline Nichol and Pasi Kolari and {Olascoaga Gracia}, Be{\~n}at and Kuusinen, {Nea Johanna} and Beatriz Fern{\'a}ndez-Mar{\'i}n and Minna Pulkkinen and Eija Juurola and Eero Nikinmaa",
year = "2012",
doi = "10.1007/s00442-012-2317-9",
language = "English",
volume = "170",
pages = "313--323",
journal = "Oecologia",
issn = "0029-8549",
publisher = "Springer",
number = "2",

}

Physiology of the seasonal relationship between Photochemical Reflectance Index and photosynthetic Light Use Efficiency. / Porcar-Castell, Albert; Garcia-Plazaola, Jose Ignacio; Nichol, Caroline; Kolari, Pasi; Olascoaga Gracia, Beñat; Kuusinen, Nea Johanna; Fernández-Marín, Beatriz; Pulkkinen, Minna; Juurola, Eija; Nikinmaa, Eero.

I: Oecologia, Vol. 170, Nr. 2, 2012, s. 313-323.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - Physiology of the seasonal relationship between Photochemical Reflectance Index and photosynthetic Light Use Efficiency

AU - Porcar-Castell, Albert

AU - Garcia-Plazaola, Jose Ignacio

AU - Nichol, Caroline

AU - Kolari, Pasi

AU - Olascoaga Gracia, Beñat

AU - Kuusinen, Nea Johanna

AU - Fernández-Marín, Beatriz

AU - Pulkkinen, Minna

AU - Juurola, Eija

AU - Nikinmaa, Eero

PY - 2012

Y1 - 2012

N2 - The Photochemical Reflectance Index (PRI) is regarded as a promising proxy to track the dynamics of photosynthetic Light Use Efficiency (LUE) via remote sensing. The implementation of this approach requires the relationship between PRI and LUE to scale not only in space but also in time. The short-term relationship between PRI and LUE is well known and is based on the regulative process of Non-Photochemical Quenching (NPQ) but at the seasonal timescale the mechanisms behind the relationship remain unclear. We examined to what extent sustained forms of NPQ, photoinhibition of reaction centres, seasonal changes in leaf pigment concentrations, or adjustments in the capacity of alternative energy sinks affect the seasonal relationship between PRI and LUE during the year in needles of boreal Scots pine. PRI and NPQ were highly correlated during most of the year but decoupled in early spring when the foliage was deeply downregulated. This phenomenon was attributed to differences in the physiological mechanisms controlling the seasonal dynamics of PRI and NPQ. Seasonal adjustments in the pool size of the xanthophyll-cycle pigments, on a chlorophyll basis, controlled the dynamics of PRI, whereas the xanthophyll de-epoxidation status and other xanthophyll-independent mechanisms controlled the dynamics of NPQ at the seasonal timescale. We conclude that the PRI leads to an underestimation of NPQ, and consequently overestimation of LUE, under conditions of severe stress in overwintering Scots pine, and most likely also in species experiencing severe drought. This severe stress-induced decoupling may challenge the implementation of the PRI approach.

AB - The Photochemical Reflectance Index (PRI) is regarded as a promising proxy to track the dynamics of photosynthetic Light Use Efficiency (LUE) via remote sensing. The implementation of this approach requires the relationship between PRI and LUE to scale not only in space but also in time. The short-term relationship between PRI and LUE is well known and is based on the regulative process of Non-Photochemical Quenching (NPQ) but at the seasonal timescale the mechanisms behind the relationship remain unclear. We examined to what extent sustained forms of NPQ, photoinhibition of reaction centres, seasonal changes in leaf pigment concentrations, or adjustments in the capacity of alternative energy sinks affect the seasonal relationship between PRI and LUE during the year in needles of boreal Scots pine. PRI and NPQ were highly correlated during most of the year but decoupled in early spring when the foliage was deeply downregulated. This phenomenon was attributed to differences in the physiological mechanisms controlling the seasonal dynamics of PRI and NPQ. Seasonal adjustments in the pool size of the xanthophyll-cycle pigments, on a chlorophyll basis, controlled the dynamics of PRI, whereas the xanthophyll de-epoxidation status and other xanthophyll-independent mechanisms controlled the dynamics of NPQ at the seasonal timescale. We conclude that the PRI leads to an underestimation of NPQ, and consequently overestimation of LUE, under conditions of severe stress in overwintering Scots pine, and most likely also in species experiencing severe drought. This severe stress-induced decoupling may challenge the implementation of the PRI approach.

KW - 1184 Genetics, developmental biology, physiology

KW - 4112 Forestry

U2 - 10.1007/s00442-012-2317-9

DO - 10.1007/s00442-012-2317-9

M3 - Article

VL - 170

SP - 313

EP - 323

JO - Oecologia

JF - Oecologia

SN - 0029-8549

IS - 2

ER -