OPERATION OF THE JUNIOR-PAM
CHAPTER 5
presentation of data is controlled by checkboxes attached to the acro-
nyms. In the sidebar, the data are distinguished into three groups,
<Online>, <SAT-Pulse>, and <Quench>.
Note that Chapter 6,
Acronyms and Equations
, provides detailed infor-
mation on fluorescence measurements and equation used by WinCon-
trol-3.
<Online> data
are continuously reported with the frequency defined in
Box (2) and the reservation reported above. The data group in-
cludes:
Ft
Chlorophyll fluorescence yield (relative units).
PAR* Photosynthetic active radiation (µmol photons
·
m
-2
·
s
-1
). In
the absence of an external quantum sensor, the PAR* is taken
from the <Int. PAR list> (see <Settings>). With a quantum
sensor connected to the JUNIOR-PAM and the <PAR*> in
Box (5) checked, the PAR* corresponds to the sum of the ac-
tinic intensity, as defined by the <Int. PAR list>, plus the data
of the external sensor. Note that the <Int. PAR list> data repre-
sent factory adjusted values which correspond to the PAR at 1
mm distance from the tip of a 400 mm JUNIOR-PAM fiber
optics, in the absence of external light. Therefore, different op-
tical conditions require measurements of the actual photon
flux densities.
Temp* Temperature (°C). In the absence of an external sensor, tem-
perature is measured by an internal integrated-circuit sensor.
<SAT-Pulse> data
are recorded with light-exposed samples close to or
during application of strong light pulses. Specifically:
F’
Fluorescence yield shortly before onset of a strong light pulse
(relative units).
Fm’
Maximal fluorescence yield when photosystem II reaction cen-
ters are closed by a strong light pulse (relative units).
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