Plant abiotic stress diagnostic by laser induced chlorophyll fluorescence spectral analysis of in vivo leaf tissue of biofuel species
2010
Laser induced fluorescence is exploited to evaluate the effect of abiotic stresses upon the evolution and characteristics
of in vivo chlorophyll emission spectra of leaves tissues of brazilian biofuel plants species(Saccharum officinarum and
Jatropha curcas). The chlorophyll fluorescence spectra of 20 min predarkened intact leaves were studied employing
several excitation wavelengths in the UV-VIS spectral region. Red(Fr) and far-red (FFr) chlorophyll fluorescence
emission signals around 685 nm and 735 nm, respectively, were analyzed as a function of the stress intensity and the
time of illumination(Kautsky effect). The Chl fluorescence ratio Fr/FFr which is a valuable nondestructive indicator of
the chlorophyll content of leaves was investigated during a period of time of 30 days. The dependence of the Chl
fluorescence ratio Fr/FFr upon the intensity of the abiotic stress(salinity) was examined. The results indicated that the
salinity plays a major hole in the chlorophyll concentration of leaves in both plants spieces, with a significant reduction
in the chlorophyll content for NaCl concentrations in the 25 - 200 mM range. The laser induced chlorophyll
fluorescence analysis allowed detection of damage caused by salinity in the early stages of the plants growing process,
and can be used as an early-warning indicator of salinity stress
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