biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 43:571-576, 2000 | DOI: 10.1023/A:1002886104333

Relationship between Cell Wall Susceptibility to Cellulases and Pectinases of Fusarium oxysporum and Susceptibility of Date Palm Cultivars

C. El Modafar1,*, E. El Boustani2
1 Laboratoire de Biotechnologie et Physiopathologie Végétales, Facultédes Sciences et Techniques de Guéliz, Département de Biologie, Marrakech, Maroc e-mail
2 Laboratoire de Biochimie Nutritionnelle et Pathologique, Facultédes Sciences Semlalia, Département de Biologie, Marrakech, Maroc

Fusarium oxysporum f. sp. albedinis, the bayoud disease agent of date palm, grows on a mineral medium containing the cell walls of date palm roots as a sole carbohydrate source. The growth and development of pathogen under these conditions was related to the production of extracellular cell wall-degrading enzymes (CWDE): cellulases, polygalacturonases, polygalacturonate transeliminases, and pectinmethylesterases. The mycelial growth and the sporulation of pathogen were higher in the presence of cell walls of susceptible cultivars (BFG, JHL, BSK) than in the presence of those of resistant cultivars (IKL, SLY, BSTN). After 8 d of fungal culture, the activity of CWDE was equal whatever is the origin of the cell walls (resistant or susceptible cultivars). After 16 d of culture, the activity of these CWDE was higher when the parasite was cultivated on the cell walls of the susceptible cultivars than on those of the resistant cultivars. A positive correlation was observed between CWDE activities and the growth and the sporulation of F. oxysporum after 16 d of culture. These results clearly show a relation between the susceptibility/resistance of the cell walls of the roots of the date palm to the parasitic CWDE and the susceptibility/resistance of the cultivars.

Keywords: cell wall-degrading enzymes; Phoenix dactylifera; resistant cultivars
Subjects: cell wall-degrading enzymes; cell wall susceptibility to cellulases and pectinases; cellulase, susceptibility of date palm cultivars; date palm cultivars, resistant to cell wall-degrading enzymes; Fusarium oxysporum; pectinase, susceptibility of date palm cultivars; Phoenix dactylifera

Published: December 1, 2000  Show citation

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El Modafar, C., & El Boustani, E. (2000). Relationship between Cell Wall Susceptibility to Cellulases and Pectinases of Fusarium oxysporum and Susceptibility of Date Palm Cultivars. Biologia plantarum, 43(4), 571-576. doi: 10.1023/A:1002886104333
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