ROLE OF PHENOLIC COMPOUNDS IN THE RESISTANCE MECHANISMS OF PHOENIX DACTYLIFERA L. AGAINST THE BRITTLE LEAF DISEASE

K. Latreche , F. Rahmania
Among the numerous diseases which affect date palm (Phoenix dactylifera L.), the brittle leaf disease (BLD) that appeared some years ago, is threatening palm groves of the Algerian Sahara. The studies we achieved and whose results are presented here, aimed to know more about this affliction whose causal agent is still unknown. Several changes in phenolic metabolism and lignin deposition have been observed in BLD-affected leaves of Phoenix dactylifera L. The most profound effect of BLD was observed on guaïacyl lignin formation among the cell wall components. Results revealed a significant decrease of guaïacyl units in fiber walls and the external part of sclerenchyma tissues. Withal, a progressive decrease of protein contents and peroxidase activity was also registered. Such modifications severely affect the cell wall integrity and alter the structural rigidity of supporting tissues. Indeed, observations revealed marked changes in structure of affected cells, especially at the level of cell wall leading to the leaves’ friability, what gives the “Brittle leaf disease” its name. More investigations on this way are in progress, the results will be presented in the near future.
Latreche , K. and Rahmania, F. 2013. ROLE OF PHENOLIC COMPOUNDS IN THE RESISTANCE MECHANISMS OF PHOENIX DACTYLIFERA L. AGAINST THE BRITTLE LEAF DISEASE . Acta Hort. (ISHS) 994:373-378
http://www.actahort.org/books/994/994_38.htm
cell wall, disease, Algerian Sahara, lignin
English

Acta Horticulturae