title: A new monitoring PAM fluorometer (MONI-PAM) to study the short- and long-term acclimation of photosystem II in field conditions.
abstract: We present and evaluate the performance of a new field monitoring PAM fluorometer (MONI-PAM) which is intended for short- and long-term monitoring of the acclimation of photosystem II (PSII). The instrument measures chlorophyll fluorescence, photosynthetic photon flux density (PPFD), and temperature in the field, and monitors exactly the same leaf area over prolonged periods of time, facilitating the estimation of both rapidly reversible and sustained non-photochemical quenching (NPQ). The MONI-PAM performance is evaluated in the lab and under natural conditions in a Scots pine canopy during spring recovery of photosynthesis. The instrument provides a new tool to study in detail the acclimation of PSII to the environment under natural field conditions.
authors.affiliation: Department of Forest Ecology, University of Helsinki, P. O. Box 27, Helsinki, 00014 Finland. joan.porcar@helsinki.fi
authors.forename: Albert
authors.initials: A
authors.lastname: Porcar-Castell
authors.forename: Erhard
authors.initials: E
authors.lastname: Pfündel
authors.forename: Janne F J
authors.initials: JF
authors.lastname: Korhonen
authors.forename: Eija
authors.initials: E
authors.lastname: Juurola
mesh_terms: D000064:Acclimatization / Q000502:physiology*; D002734:Chlorophyll / Q000737:chemistry / Q000378:metabolism*; D005453:Fluorescence; D005470:Fluorometry / Q000295:instrumentation / Q000379:methods*; D010788:Photosynthesis / Q000502:physiology; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D041605:Pinus sylvestris / Q000254:growth & development / Q000378:metabolism; D012621:Seasons; D013696:Temperature; D013997:Time Factors
chemical_list: D045332:Photosystem II Protein Complex; D002734:Chlorophyll