The Dualex is an optical sensor used in plant science and agriculture for the assessment of

flavonol Flavonols are a class of flavonoids that have the 3-hydroxyflavone backbone (IUPAC name: 3-hydroxy-2-phenylchromen-4-one). Their diversity stems from the different positions of the phenolic –OH groups. They are distinct from flavanols (with ...

anthocyanin Anthocyanins (), also called anthocyans, are solubility, water-soluble vacuole, vacuolar pigments that, depending on their pH, may appear red, purple, blue, or black. In 1835, the German pharmacist Ludwig Clamor Marquart named a chemical compou ...

, and

chlorophyll Chlorophyll is any of several related green pigments found in cyanobacteria and in the chloroplasts of algae and plants. Its name is derived from the Greek words (, "pale green") and (, "leaf"). Chlorophyll allows plants to absorb energy ...

contents in leaves. This device allows researchers to perform real-time and non-destructive measurements of these important plant metabolites, which are crucial indicators of plant health and stress responses. Developed by Force-A (now out of business), the sensor is a result of technology transfer from the

CNRS The French National Centre for Scientific Research (, , CNRS) is the French state research organisation and is the largest fundamental science agency in Europe. In 2016, it employed 31,637 staff, including 11,137 tenured researchers, 13,415 eng ...

(National Center for Scientific Research) and University of Paris-Sud Orsay. It allows to make instant measurements without damaging the leaves. The main applications are plant sciences and agricultural research.

Calculated parameters

The assessment of polyphenolic compounds in leaves is based on the absorbance of the leaf epidermis through the screening effect it procures to chlorophyll fluorescence. The parameters calculated by Dualex are: * Anth, for the

index * Chl, for the

content * Flav, for the

flavonols Flavonols are a class of flavonoids that have the 3-hydroxyflavone backbone (IUPAC name: 3-hydroxy-2-phenylchromen-4-one). Their diversity stems from the different positions of the phenolic –OH groups. They are distinct from flavanols (with ...

index * NBI, for the nitrogen balance index

Applications

Based on the four measured indices, this optical sensor is applied in the fields of research as follows: *

Plant physiology Plant physiology is a subdiscipline of botany concerned with the functioning, or physiology, of plants. Plant physiologists study fundamental processes of plants, such as photosynthesis, respiration, plant nutrition, plant hormone functions, tr ...

Sajjad Hussain, Frank Curk, Claudie Dhuique-Mayer, Laurent Urban, Patrick Ollitrault, François Luro, Raphaël Morillon. 201
Autotetraploid trifoliate orange (Poncirus trifoliata) rootstocks do not impact clementine quality but reduce fruit yields and highly modify rootstock/scion physiology
Scientia Horticulturae. Volume 134. Pages 100–107 * Genetic studies * Plant phenology * Herbal selection It is equally applied in studies related to chlorophyll (nutritional chlorosis, potential photosynthesis), flavonols (UV protection,Pfündel, E.E., Ben Ghozlen, N., Meyer, S., Cerovic, Z.G. 200
Investigating UV screening in leaves by two different types of portable UV fluorimeters reveals in vivo screening by anthocyanins and carotenoids
Photosynth. Res., 93:205-221. leaf light environment) and anthocyanins (temperature stress, light selection).

References

{{reflist Optical devices Sensors