TY - JOUR
T1 - Steady-state chlorophyll fluorescence (Fs) measurements as a tool to follow variations of net CO2 assimilation and stomatal conductance during water-stress in C3 plants
AU - Flexas, Jaume
AU - Escalona, José Mariano
AU - Evain, Sebastian
AU - Gulías, Javier
AU - Moya, Ismaël
AU - Osmond, Charles Barry
AU - Medrano, Hipólito
PY - 2002
Y1 - 2002
N2 - Water stress experiments were performed with grapevines (Vitis vinifera L.) and other C3 plants in the field, in potted plants in the laboratory, and with detached leaves. It was found that, in all cases, the ratio of steady state chlorophyll fluorescence (Fs) normalized to dark-adapted intrinsic fluorescence (Fo) inversely correlated with non-photochemical quenching (NPQ). Also, at high irradiance, the ratio Fs/Fo was positively correlated with CO2 assimilation in air, with electron transport rate calculated from fluorescence, and with stomatal conductance, but no clear correlation was observed with qP. The significance of these relationships is discussed. The ratio Fs/Fo, measured with a portable instrument (PAM-2000) or with a remote sensing FIPAM system, provides a good method for the early detection of water stress, and may become a useful guide to irrigation requirements.
AB - Water stress experiments were performed with grapevines (Vitis vinifera L.) and other C3 plants in the field, in potted plants in the laboratory, and with detached leaves. It was found that, in all cases, the ratio of steady state chlorophyll fluorescence (Fs) normalized to dark-adapted intrinsic fluorescence (Fo) inversely correlated with non-photochemical quenching (NPQ). Also, at high irradiance, the ratio Fs/Fo was positively correlated with CO2 assimilation in air, with electron transport rate calculated from fluorescence, and with stomatal conductance, but no clear correlation was observed with qP. The significance of these relationships is discussed. The ratio Fs/Fo, measured with a portable instrument (PAM-2000) or with a remote sensing FIPAM system, provides a good method for the early detection of water stress, and may become a useful guide to irrigation requirements.
UR - http://www.scopus.com/inward/record.url?scp=0036207198&partnerID=8YFLogxK
U2 - 10.1034/j.1399-3054.2002.1140209.x
DO - 10.1034/j.1399-3054.2002.1140209.x
M3 - Article
SN - 0031-9317
VL - 114
SP - 231
EP - 240
JO - Physiologia Plantarum
JF - Physiologia Plantarum
IS - 2
ER -