title: Chlorophyll fluorescence lifetime determination of waterstressed C3- and C4-plants.
abstract: This article describes the effect of water stress on the room temperature chlorophyll fluorescence lifetime of plants of wheat (C3) and maize (C4). In addition, net CO2 assimilation rate (PN), stomatal conductance and the fluorescence quenching coefficients qP and qNP at steady state conditions were recorded. The overall fluorescence decay of the control plants can be described by an average decay time of 1 ns for both plant types. Water stress did not modify this parameter in the case of wheat, whereas a shortening of the decay was observed for waterstressed maize plants (tau = 0.45 ns). This shortening in the chlorophyll fluorescence decay was accompanied by an increase in the non-photochemical quenching (qNP). The photochemical quenching (qP) and therefore the electron transport via photosystem II remains unaffected by water stress. The most pronounced effect of the stress for both plant types was a decrease in PN due to a closure of the stomata.
authors.affiliation: CEC-JRC, Institute for Remote Sensing Applications, Ispra, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Schmuck
authors.forename: I
authors.initials: I
authors.lastname: Moya
authors.forename: A
authors.initials: A
authors.lastname: Pedrini
authors.forename: D
authors.initials: D
authors.lastname: van der Linde
authors.forename: H K
authors.initials: HK
authors.lastname: Lichtenthaler
authors.forename: F
authors.initials: F
authors.lastname: Stober
authors.forename: C
authors.initials: C
authors.lastname: Schindler
authors.forename: Y
authors.initials: Y
authors.lastname: Goulas
mesh_terms: D002734:Chlorophyll / Q000737:chemistry*; D005453:Fluorescence; D014908:Triticum / Q000737:chemistry*; D014867:Water / Q000008:administration & dosage*; D003313:Zea mays / Q000737:chemistry*
chemical_list: D014867:Water; D002734:Chlorophyll