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Evaluation of postharvest treatments with chemical resistance inducers to control green and blue molds on orange fruit

Published on Nov 1, 2013in Postharvest Biology and Technology3.927
· DOI :10.1016/j.postharvbio.2013.05.013
Pedro A. Moscoso-Ramírez6
Estimated H-index: 6
,
Lluís Palou27
Estimated H-index: 27
Sources
Abstract
Abstract Preventive and curative activities of postharvest treatments with selected chemical resistance inducers to control postharvest green (GM) and blue (BM) molds on oranges (cvs. ‘Valencia’ or ‘Lanelate’) artificially inoculated with Penicillium digitatum and Penicillium italicum , respectively, were evaluated. In vivo primary screenings to select the most effective chemicals and concentrations were performed with benzothiadiazole (BTH), β-aminobutyric acid (BABA), 2,6-dichloroisonicotinic acid (INA), sodium silicate (SSi), salicylic acid (SA), acetylsalicylic acid (ASA) and harpin. INA at 0.03 mM, SA at 0.25 mM, BABA at 0.3 mM and BTH at 0.9 mM were selected and tested afterwards as dips at 20 °C for 60 or 150 s with oranges artificially inoculated before or after the treatment and incubated for 7 d at 20 °C. Although it was an effective treatment, SSi at 1000 mM was discarded because of potential phytotoxicity to the fruit rind. Preventive or curative postharvest dips at room temperature had no effect or only reduced the development of GM and BM very slightly. Therefore, these treatments cannot be recommended for inclusion in postharvest decay management programs for citrus packinghouses.
  • References (7)
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References7
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The aim of this study was to find an alternative to synthetic fungicides currently used in the control of devastating fungal pathogen Penicillium digitatum Sacc, the causal agent of green mould disease of blood orange. Antifungal activities of salicylic acid (SA) were investigated against P. digitatum. Treatments consisted of five concentrations (0, 1, 2, 4 and 5 mM). The SA application significantly decreased weight loss percentage and increased life storage of fruits. Also, SA positively affec...
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Abstract The effectiveness of sodium bicarbonate (SB), sodium carbonate (SC), sodium silicate (SS), potassium bicarbonate (PB), potassium carbonate (PC), potassium sorbate (PS), calcium chloride (CC), and calcium chelate (CCh) against naturally occurring postharvest decay on ‘Comune’ clementine and ‘Valencia late’ orange fruit was investigated. Aqueous salt solutions (2%, w/v, 20 hl ha −1 ) were applied according to three strategies: (i) by spraying before harvest, (ii) by dipping after harvest,...
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The present studies aimed to develop control of citrus green and blue moulds caused by Penicillium digitatum and P. italicum, respectively, using elicitors as an alternate to synthetic chemicals. The dose-responsive toxicity of two organic elicitors was evaluated through a series of in vitro and in vivo experiments including pre- and postharvest application of different concentrations of salicylic acid (SA) or methyl jasmonate (MeJ) to ‘Lane Late’ sweet orange fruit for resistance induction. In ...
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