Articles
EVALUATION OF SUSCEPTIBILITY OF PISTACIA GENOTYPES TO VERTICILLIUM WILT DISEASE
Article number
1028_33
Pages
205 – 210
Language
English
Abstract
In Tunisia, the genetic diversity of local resources is still poorly understood and underutilized.
The low diversity of cultivars and rootstocks is one of the factors responsible for the low productivity of this culture.
Current research focused on the preservation assessment and valorization of local resources to enhance diversity.
The main objective of this study was the assessment of local Pistacia genotypes susceptibility to fungal diseases.
Two-year-old seedlings of five genotypes of Pistacia atlantica (PAV, PAX1, PAJ, PAJ2 and P3) and one genotype of Pistacia vera Mateur were tested for sensitivity to Verticillium dahlia. Results revealed that most genotypes are moderately susceptible to this disease.
However, the genotype PAV of Pistacia atlantica exhibited higher tolerance to Verticillium wilt.
This genotype showed a high content of total polyphenols, which are optionally involved in the mechanism of resistance to Verticillium. The observation of the cut stem showed internal browning of vascular conducting tissues.
The inoculation of four isolates of Verticillium dahliae on twigs of more aged trees showed a strong pathogenicity of the isolate VK1.1. This method showed a quite slow extending of the disease compared to the inoculation method performed on young pistachio trees.
The low diversity of cultivars and rootstocks is one of the factors responsible for the low productivity of this culture.
Current research focused on the preservation assessment and valorization of local resources to enhance diversity.
The main objective of this study was the assessment of local Pistacia genotypes susceptibility to fungal diseases.
Two-year-old seedlings of five genotypes of Pistacia atlantica (PAV, PAX1, PAJ, PAJ2 and P3) and one genotype of Pistacia vera Mateur were tested for sensitivity to Verticillium dahlia. Results revealed that most genotypes are moderately susceptible to this disease.
However, the genotype PAV of Pistacia atlantica exhibited higher tolerance to Verticillium wilt.
This genotype showed a high content of total polyphenols, which are optionally involved in the mechanism of resistance to Verticillium. The observation of the cut stem showed internal browning of vascular conducting tissues.
The inoculation of four isolates of Verticillium dahliae on twigs of more aged trees showed a strong pathogenicity of the isolate VK1.1. This method showed a quite slow extending of the disease compared to the inoculation method performed on young pistachio trees.
Authors
M.A. Triki, A. Chelli Chaabouni, A. Rhouma, M. Cheffi, A. Mseddi , M. Boudaya
Keywords
Pistacia atlantica, genotypes, Verticillium, sensitivity, tolerance
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