Effects of pre- and post-harvest application of salicylic acid or methyl jasmonate.pdfVIP

Effects of pre- and post-harvest application of salicylic acid or methyl jasmonate.pdf

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Effects of pre- and post-harvest application of salicylic acid or methyl jasmonate

Postharvest Biology and Technology 35 (2005) 253–262 Effects of pre- and post-harvest application of salicylic acid or methyl jasmonate on inducing disease resistance of sweet cherry fruit in storage Hongjie Yao a,b , Shiping Tian a,? a Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, The Chinese Academy of Sciences, Xiangshan Nanxincun 20, Haidian District, Beijing 100093, China b Graduate School of the Chinese Academy of Sciences, Yuquanroad 19, Haidian District, Beijing 100039, China Received 9 June 2004; accepted 12 September 2004 Abstract Pre-harvest treatments with 2 mM salicylic acid (SA) and 0.2 mM methyl jasmonate (MeJA) significantly reduced lesion diameters on sweet cherry fruit caused by Monilinia fructicola compared with control post-harvest treatments. Pre-harvest treatment of sweet cherry with SA or MeJA induced -1,3-glucanase, phenylalanine ammonia-lyase (PAL) and peroxidase (POD) activities during the early storage time. The efficacy of inducing resistance in sweet cherry fruit pre-harvest-treated with SA or MeJA to M. fructicola was better than that for fruit with post-harvest treatments, especially, at 25 ? C. Activities of -1,3-glucanase and PAL in SA- or MeJA-treated cherry fruit stored at 25 ?C for both pre- and post-harvest treatments were s f i h ? K 1 v f ( 0ignificantly higher than those in fruit stored at 0 ? C. SA with a concentration of 2 mM showed direct fungitoxicity on M. ructicola and significantly inhibited mycelial growth and spore germination of the pathogen in vitro. MeJA at 0.2 mM had little nhibitory effect on mycelial growth and spore germination of M. fructicola. The fruit treated with MeJA pre-harvest expressed igher activity of -1,3-glucanase and PAL than fruit treated with SA and the control during the early storage time. 2004 Elsevier B.V. All rights reserved. eywords: Salicylic acid; Methyl jasmonate; Sweet cherry fruit; Inducing resistance . Introduction Fungal diseases re

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