Evaluation of instant light‐response curves of chlorophyll fluorescence parameters obtained with a portable chlorophyll fluorometer on site in the field

Nutrients limit photosynthesis in seedlings of a lowland tropical forest tree species

“…A total of 16-20 seedlings \0.5 m height in each of the eight treatment combinations were measured. We characterized photosynthesis with fluorescence-light curves (White and Critchley 1999;Rascher et al 2000) simultaneously measured with CO 2 assimilation using a portable infrared gas analyzer (Model LI-6400; Li-Cor Biosciences, Lincoln, NE, USA) equipped with a leaf chamber chlorophyll fluorescence meter and red/blue light source (Model LI-6400-40; Li-Cor Biosciences). Leaves were dark adapted for 30 s before an initial measurement was taken at 0 lmol m -2 s -1 photon flux density (PFD).…”

The use of remote sensing in light use efficiency based models of gross primary production: A review of current status and future requirements

“…Kolber et al, 2005). These pulse-modulated measuring systems, probe the yield of chlorophyll fluorescence under steady-state illumination (Fs) and during a short saturating flash delivered at close range (1-100 mm), and have been successfully used for measuring photosynthesis (Adams et al, 1999;Rascher et al, 2000). However, their application is mostly restricted to individual leaves in accessible canopies (Ananyev et al, 2005), with a few notable exceptions (e.g.…”

Fluorescência da clorofila a em folhas de tangerineira 'Ponkan' e limeira ácida 'Tahiti' submetidas ao estresse hídrico

“…o F 0 representa a fluorescência inicial, correspondente à fração da energia absorvida pelo complexo-antena e não é transmitida, ou seja, não é absorvida pelos pigmentos fotossintéticos (Rascher et al, 2000). Dessa forma, a avaliação desses parâmetros é útil para mensurar as alterações na capacidade fotossintética das plantas em decorrência de estresse causado por deficiência hídrica.…”