No abstract
Arabidopsis Thaliana is a plant composed mainly of cellulose and lignin. Geneticists need techniques able to make differences at the molecular level between modified plants (DML6, CAD C/D) and non-modified ones. Thermo-stimulated current (TSC) analysis is a promising route to identify gene mutations. For the non-modified plant, at low temperatures, TSC thermograms highlight three dielectric relaxation modes. From −150 to −110 • C, γ Cellulose is attributed to CH 2 OH and-OH groups of cellulose. Between −110 and −80 • C, β Lignin is detected. From −80 to −40 • C, β Cellulose is characteristic of the molecular mobility of glycosidic linkages. For the CAD C/D modified plants, only γ Cellulose and β Lignin are observed; due to analogous enthalpy values, those modes have the same molecular origin as in the non-modified plant. So, the β Lignin mode is associated with the molecular mobility of the lignin-OH groups. The CAD C/D gene mutation changes the chemical structure of lignin, which promotes hydrogen bonds in the network and inhibits molecular mobility of glucosidic rings. It is also interesting to note that the DML6 gene mutation induces a higher cooperativity of this β Cellulose relaxation than in wild vegetal composites. In fact, this mutation promotes molecular mobility of glycosidic rings thanks to β 1-4 glycosidic linkages.
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