| Range |
3e-7 - 7e-8 Unitless
|
| Organism |
Generic |
| Reference |
Tyystjärvi E, Aro EM. The rate constant of photoinhibition, measured in lincomycin-treated leaves, is directly proportional to light intensity. Proc Natl Acad Sci U S A. 1996 Mar 5 93(5):2213-8.PubMed ID11607639
|
| Method |
(For value of 7x10^-8) Researchers illuminated Pumpkin (Cucurbita pepo L.). The illumination was done in a
phytotron and the PPFD (Photosynthetic
Photon Flux Density) values were adjusted with neutral
density filters (Lee Filters, Andover, England). The initial (Fo) and maximum
(Fmax) fluorescence levels were measured from leaf discs with
a pulse amplitude modulated fluorometer (PAM 101 Heinz
Walz, Effeltrich, Germany), using a saturating flash (7000
µmol of photons/(m^2xs^1) duration, 1 s) for Fmax. The apparent quantum yield of photoinhibition, fpI, was
calculated from the initial slope of the decrease in active PSII
according to equation 1, page 2214 |
| Comments |
The quantum yield of photoinhibition in vivo, from 7x10^-8
(based on incident light) in the present study to 3x10^-7
(calculated for the bulk PSII based on light absorbed
by PSII pigments in Park et al, Light inactivation of functional photosystem II in leaves of peas grown in moderate light depends on photon exposure, Planta 1995) is the same order of magnitude as that of the
photoinhibition of oxygen-evolving PSII membrane fragments
(29) or as can be estimated by recalculating from photoinhibition
of isolated thylakoids illuminated in the absence of
added electron acceptors (30, 31). (Numbers in parentheses indicate references in article). |
| Entered by |
Uri M |
| ID |
105141 |