Response to juglone toxic effect in various genotypes of banana (Musa AA, AAA, AAB, AAAA, AAAB)

摘要: In Cote d'Ivoire, Black Sigatoka, caused by Mycosphaerella fijiensis Morelet, is a major constraint in banana plantain production. The use of juglone, purified toxin this pathogen, could constitute an alternative the early selection new genotypes resistant to Leaf Streak Disease (BLSD). Local cultivars and hybrids be vulgarized, were evaluated order elucidate variability varieties assess possibility using juglone breed for resistance BLSD. Necrosis induction bioassays, electrolyte leakage, combined with phenolic compound quantifications performed on both diploid triploid reference cultivars, as well tetraploid following infiltration. Results show, based minimal concentrations intensities necrosis, that sensitivity was generally related susceptibility disease field. exhibited lowest necrosis when concentration less than 100 ppm. Forty eight hours after treatment, phenols content FHIA23 PITA14 at basal level. These probably produced antioxidants high affinity active oxygen species (AOS) inducing their tolerance disease. This study confirms simple rapid screening Pathological physiological parameters biochemical evaluation, best strategy identifying genotype greatest . However, great not systematically higher total phenols. est un parasite necrotique occasionnant la cercosporiose noire, qui constitue l'une des contraintes majeures production de bananes desserts et plantains en d'Ivoire. L'utilisation metabolite toxique purifie du pathogene ete envisagee comme une voie precoce nouveaux bananiers resistants maladie raies noires (MRN). Des locaux hybrides vulgariser ont evalues vue d'elucider variabilite reaction entre confirmer possibilite d'utiliser pour le criblage contre MRN. Les tests d'induction necroses perte d'electrolytes associes au dosage quantitatif composes phenoliques realises sur diploides triploides, ainsi que tetraploides infiltres avec juglone. intensites les minimales evaluees montre sensibilite globalement identique leur niveau d'infestation champ. Pour tetraploides, plus faibles (< 40 %) lorsque inferieure En outre, 48 h apres traitement, PITA14, presente retour teneur initiale La forte ces serait due synthese d'antioxydants, affinite formes actives d'oxygene (FAO). Ces resultats confirment l'utilisation rapide Une combinaison parametres pathologique, physiologique biochimique strategie ideale fiable Cependant, cette grande n'est pas systematiquement liee elevee totaux. Mots Cles : Reaction differentielle, noires, bananiers,