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Light harvesting control in plants.

Alexander V Ruban1

  • 1School of Biological and Chemical Sciences, Queen Mary University of London, London, UK.

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PubMed
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Plants protect themselves from light damage through nonphotochemical quenching (NPQ). This process involves the aggregation of the light-harvesting complex II (LHCII), reducing its efficiency and dissipating excess energy as heat.

Keywords:
LHCIIaggregationchlorophylllight harvestingnonphotochemical fluorescence quenchingproton gradientzeaxanthin

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Area of Science:

  • Plant biology
  • Photosynthesis research
  • Photoprotection mechanisms

Background:

  • The 1991 hypothesis proposed that light-harvesting complex II (LHCII) aggregation controls light harvesting and prevents photodamage in plants.
  • Aggregated LHCII exhibits reduced light-harvesting efficiency and dissipates absorbed energy as heat.
  • This phenomenon is characterized by a very low chlorophyll fluorescence yield, termed nonphotochemical quenching (NPQ).

Purpose of the Study:

  • To trace the development of the hypothesis linking LHCII aggregation to NPQ.
  • To present the evolution of this concept into a widely accepted model.
  • To provide a historical perspective on NPQ research.

Main Methods:

  • Review of a 1991 hypothesis article.
  • Discussion of experimental evidence supporting LHCII aggregation in NPQ.
  • Narrative of scientific model development over time.

Main Results:

  • The initial hypothesis regarding LHCII aggregation in NPQ has gained broad acceptance.
  • The mechanism of energy dissipation via LHCII aggregation is increasingly understood.
  • NPQ is now recognized as a crucial photoprotective process.

Conclusions:

  • The aggregation of LHCII is a key mechanism underlying nonphotochemical quenching in plants.
  • This model provides a robust explanation for how plants manage excess light energy.
  • The research community broadly accepts the LHCII aggregation model for NPQ.