Effect of Juglone on Active Oxygen Species and Antioxidant Enzymes in Susceptible and Partially Resistant Banana Cultivars to Black Leaf Streak Disease |
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Authors: | Email author" target="_blank">A?El HadramiEmail author D?Kone P?Lepoivre |
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Institution: | 1.Department of Plant Science,University of Manitoba,Winnipeg,Canada;2.D. Kone,C?te d’Ivoire,Ivory Coast;3.Faculté Universitaire des Sciences Agronomiques de Gembloux,Unité de Phytopathologie,Gembloux,Belgium |
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Abstract: | The black leaf streak disease (BLSD), caused by Mycosphaerella fijiensis, is the most destructive disease of bananas and plantains around the world. Breeding for resistance is the most promising
strategy to fight this disease especially in small farmer plantations. Mycosphaerella fijiensis produces many phytotoxins such as juglone, which can be used, jointly with field and inoculations under controlled conditions,
for screening banana cultivars for BLSD-resistance. This non-host specific phytotoxin has been shown to act on chloroplasts
and disturbs the proton electrochemical gradient across the plasmalemma membrane. Moreover, an involvement of the oxidative
burst during the interaction has been suggested. The present study was carried out using two cultivars that differed for either
their juglone-responses or their resistance to BLSD (cv. Grande Naine susceptible to BLSD and juglone and cv. Fougamou partially
resistant to BLSD and highly tolerant to juglone). The production of active oxygen species (AOS) and the enhancement of the
enzymatic and/or non-enzymatic AOS-scavenging systems were investigated after treatment of the two cultivars with juglone.
The time-course of AOS-production and AOS-scavenging was shown to be the key difference between these two tested cultivars
after treatment with juglone. Thus, an early release of AOS (O2− radical and H2O2) and a quick stimulation of a preferment anti-oxidant system (superoxide dismutases, catalases, and peroxidases) was observed
for cv. Fougamou as compared to cv. Grande Naine for which a late and weak generation of AOS accompanied by a late stimulation
of the anti-oxidant systems were detected. |
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Keywords: | Antioxidant systems AOS Banana Black Leaf Streak Disease juglone Mycosphaerella fijiensis |
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