Fluorescence spectroscopy applied to orange trees

Abiotic Stress Diagnosis via Laser Induced Chlorophyll Fluorescence Analysis in Plants for Biofuel

“…The measured concentrations were 1.5 mg/g, 1.52 mg/g, and 1.53 mg/g for the control, 50% field capacity, and 0%(nonwaterd) field capacity, respectively. The decrease of the Fr/FFr ratio was observed previously by Chappelle and co-workers in soybeans (Chappelle et al, 1984), Dahn and coworkers in maize (Dahn et al, 1992), and by Marcassa and co-workers in orange trees (Marcassa et al, 2006). The most visible sign of water stress in the majority of plants is wilting.…”

“…One of the main crops currently being proposed as a diesel/kerosene substitute or extender, is Jatropha curcas (Linnaeus) (Openshaw 2000, Francis et al, 2005. Water stress studies have been already carried out in several plant species, seeking for responses of different mechanisms in leaves under water distress (Theisen, 1988;Chappelle et al, 1984;Dahn et al, 1992;Broglia, 1993;Munns, 2002;Marcassa et al, 2006;Abou Kheira & Atta, 2009;Maes et al, 2009;Caires et al, 2010;Robredo et al, 2010;Patane & Cosentini, 2010;Tushar et al, 2010;Silva et al, 2010). In this section, the effect of water deficit in jatropha plants is investigated using chlorophyll fluorescence spectroscopy.…”

The quest for understanding phenotypic variation via integrated approaches in the field environment

“…As an example, fluorescence spectroscopy was used to distinguish citrus (Citrus spp.) plants experiencing mechanical injury, drought, variegated chlorosis, or bacterial infection Marcassa et al, 2006;Belasque et al, 2008;Bock et al, 2008). Granum et al (2015) investigated the ability to detect early stages of infection of avocado (Persea americana) by the fungus Rosellinia necatrix using fluorescence and thermal imaging.…”

Uso de imagens de fluorescência para monitoramento da evolução do cancro cítrico

“…Marcassa e colaboradores (27) As técnicas de imagens de fluorescência são um aperfeiçoamento em relação às técnicas espectroscópicas, pois fornecem informação espectral ao longo de uma área maior.…”

“…Tal fato está de acordo com a literatura (27). Estas duas excitações representam uma das regiões do espectro onde as clorofilas absorvem fortemente (400 -500 nm), como mostrado na figura 2.1.…”