Action spectra of photosystems I and II in state 1 and state 2 in intact sugar maple leaves

Konka Veeranjaneyulu, Roger Leblanc

Research output: Contribution to journalArticle

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Abstract

Photochemical activity, measured as energy storage of photosystems I (PSI) and Il (PSII) together and individually, is studied in sugar maple (Acer saccharum Marsh.) leaves in the spectral range between 400 and 700 nm in state 1 and state 2. Total photochemical activity remains the same in both state 1 and state 2 between 580 and 700 nm, but it is lower in state 2 between 400 and 580 nm. Both PSI and PSII activities change significantly during the state transition due to the migration of light-harvesting chlorophyll a/b protein complex of PSII (LHCII). In the action spectra of PSI and PSII, peak positions vary depending on the association or dissociation of LHCII, except for the peak at 470 nm in the PSII spectrum. PSII activity is about 3 times higher than or equal to PSI in state 1 or state 2, respectively, over most of the spectrum except in the blue and far-red regions. At 470 nm, PSII activity is 8 or 1.6 times higher than PSI in state 1 or state 2, respectively. The amplitude of LHCII coupling-induced change is the same in both PSI and PSII between 580 and 700 nm, but it is less in PSI than in PSII between 400 and 580 nm, which explains the lower photochemical activity of the leaf in state 2 than in state 1. This may be due to a decrease in energy transfer efficiency of carotenoids to chlorophylls in LHCII when it is associated with PSI.

Original languageEnglish
Pages (from-to)1209-1214
Number of pages6
JournalPlant Physiology
Volume104
Issue number4
StatePublished - Apr 1 1994
Externally publishedYes

Fingerprint

Acer
Photosystem I Protein Complex
Photosystem II Protein Complex
Acer saccharum subsp. saccharum
photosystem I
photosystem II
leaves
chlorophyll
Chlorophyll Binding Proteins
Acer saccharum
Action Spectrum
Wetlands
Energy Transfer
Carotenoids
Chlorophyll
energy transfer
marshes
carotenoids
Light

ASJC Scopus subject areas

  • Plant Science

Cite this

Action spectra of photosystems I and II in state 1 and state 2 in intact sugar maple leaves. / Veeranjaneyulu, Konka; Leblanc, Roger.

In: Plant Physiology, Vol. 104, No. 4, 01.04.1994, p. 1209-1214.

Research output: Contribution to journalArticle

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