Relation Entre Le Degre De Pourriture, LImpedance Des Tissus Et La Densite Optique DUn Extrait A LAcetate DEthyle Chez La Racine De La Luzerne

Richard, C.; Gagnon, C.

Canadian Journal of Plant Science 56(1): 59-61


ISSN/ISBN: 0008-4220
DOI: 10.4141/cjps76-010
Accession: 068493897

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The impedance of blocks of root tissue of several different rot indices was measured in alfalfa. In addition, optical density readings of ethyl acetate extracts of these blocks were made at 275 and 350 nm. Calculation of the coefficient of correlation between impedance and rot indices 2 to 5 indicates a significant negative correlation. On the other hand, a strong positive correlation was observed between high optical densities and elevated rot indices. While greater precision is achieved with optical density principally for low level of rot, experience indicates that a rot index estimated visually is the most rapid practical method.