title: Black leaf streak disease affects starch metabolism in banana fruit.
abstract: Black leaf streak disease (BLSD), also known as black sigatoka, represents the main foliar disease in Brazilian banana plantations. In addition to photosynthetic leaf area losses and yield losses, this disease causes an alteration in the pre- and postharvest behavior of the fruit. The aim of this work was to investigate the starch metabolism of fruits during fruit ripening from plants infected with BLSD by evaluating carbohydrate content (i.e., starch, soluble sugars, oligosaccharides, amylose), phenolic compound content, phytohormones, enzymatic activities (i.e., starch phosphorylases, α- and β-amylase), and starch granules. The results indicated that the starch metabolism in banana fruit ripening is affected by BLSD infection. Fruit from infested plots contained unusual amounts of soluble sugars in the green stage and smaller starch granules and showed a different pattern of superficial degradation. Enzymatic activities linked to starch degradation were also altered by the disease. Moreover, the levels of indole-acetic acid and phenolic compounds indicated an advanced fruit physiological age for fruits from infested plots.
authors.affiliation: Department of Food Science and Experimental Nutrition, FCF, University of São Paulo, São Paulo, Brazil.
authors.forename: Lorenzo de Amorim
authors.initials: Lde A
authors.lastname: Saraiva
authors.forename: Florence Polegato
authors.initials: FP
authors.lastname: Castelan
authors.forename: Renata
authors.initials: R
authors.lastname: Shitakubo
authors.forename: Neuza Mariko Aymoto
authors.initials: NM
authors.lastname: Hassimotto
authors.forename: Eduardo
authors.initials: E
authors.lastname: Purgatto
authors.forename: Marc
authors.initials: M
authors.lastname: Chillet
authors.forename: Beatriz Rosana
authors.initials: BR
authors.lastname: Cordenunsi
mesh_terms: D001203:Ascomycota / Q000502:physiology*; D005638:Fruit / Q000378:metabolism*; D028521:Musa / Q000378:metabolism* / Q000382:microbiology; D018515:Plant Leaves / Q000378:metabolism / Q000382:microbiology*; D013213:Starch / Q000378:metabolism*
chemical_list: D013213:Starch