A relationship between Bayoud disease severity and toxin susceptibility of date palm cultivars

Abstract

The Bayoud disease, caused by Fusarium oxysporum f. sp. albedinis (Foa, constitutes a serious threat to the date palm plantations in Morocco, Algeria and Mauritania. Three isolates of Foa were in vivo and in vitro examined for their pathogenicity and effect of culture fi ltrate phytotoxicicity. Our results indicated that, the agressivity of Foa strains was related to the effect observed with their culture fi ltrate and toxic fraction FII, which contains fusaric acid as a major compound, on detached leaves and seedling of date palm susceptible cultivars. This relationship between pathogenity and phytotoxic effect raises the question of the role of those phytotoxic compounds on beyond pathogenicity, and consequently their key role on breeding for resistance.

Correlation between Hydrolytic Enzymes Activity, Geographical Origin and Pathogenicity of Some Isolates of Fusarium oxysporum f. sp. albedinis

“…Currently, the identification of pathogenic Fusarium oxysporum isolates is mainly based on pathogenicity tests [24]. In our work the high mortality rate was recorded in seedlings inoculated with the 20 isolates of Foa, result confirming their belonging to the special form albedinis, compared to control seedlings, these results also coincide with those reported by several authors who mention the pathogenicity of Foa isolates against date palm seedlings [25][26][27].…”

Pathogenicity and biological control of Bayoud disease by Trichoderma longibrachiatum and Artemisia herba-alba essential oil

“…isolated from soil and control plants. A mortality rate of 70% was recorded, and this result is proximate to that reported by Karkachi et al (2014) and Oubraim et al (2016). The first symptoms of the disease were observed on the leaves of the inoculated seedlings, appearing with a yellow color and then these leaves are dried, which leads to the death of the latter and to sowing at the latest.…”

Zinc and Copper Enhance Cucumber Tolerance to Fusaric Acid by Mediating Its Distribution and Toxicity and Modifying the Antioxidant System

“…FA alters membrane permeability, inhibits ATP synthesis and disturbs the water balance through uncontrolled water loss from injured cells [9][10][11][12]. FA causes the reduction of root elongation in Arabidopsis and date palm [13,14] and root cell dysfunction in tomato and cucumber seedlings [15,16]. Further, these all confirm the major and even decisive role of FA in the disease progression.…”