Olvera González, Ernesto; Alaniz Lumbreras, Daniel; Ivanov, Rumen; Villa Hernández, José de Jesús; De la Rosa Vargas, José Ismael; Lépez Cruz, Irineo; Silos Espino, Héctor; Lara Herrera, Alfredo
Resumen:
The effects of pulsed light based-LEDs at eleven
frequencies (0.1, 1, 10, 50, 100, 500 Hz, 1, 5, 10, 50
and 100 kHz) programmed at 50 % duty cycle were analyzed,
obtaining important parameters of the fluorescence
emission of chlorophyll such as: maximum fluorescence
(Fm0), minimum fluorescence, the fluorescence emission in
steady state, maximum efficiency of PSII (Fv0/Fm0), the
fraction of PSII centers that are open, photochemical
quenching, nonphotochemical quenching (NPQ), quantum
efficiency of photosystem II (UPSII), electron transport
rate (ETR) and quantum yield of CO2 assimilation (/CO2).
For the study and validation of the results obtained in the
experiments, the analysis of variance (ANOVA) was
applied 0for each parameter with confidence intervals of
95 %. The results show that the frequencies of pulsed light
had positive and negative effects on the fluorescence
parameters with respect to the control treatment (continuous
light). The frequencies that generated the best performance
of Fv0/Fm0, NPQ, UPSII, ETR, /CO2 in tomato
plants were 0.1, 1, 100 Hz, and 1 kHz. The increase
obtained in these parameters can represent an optimal
growth and productivity conditions for optimal energy
consumption.