. 2015. Controlled atmosphere-related injury in 'Honeycrisp' apples is associated with g-aminobutyrate accumulation. Can. J. Plant Sci. 95: 879Á886. 'Honeycrisp' apples (Malus )domestica Borkh.), including fruit treated with the ethylene antagonist 1-methylcyclopropene (1-MCP), can be susceptible to controlled atmosphere (CA)-related injury of the flesh tissue during storage. To better understand the biomarkers associated with this physiological disorder, we compared the temporal responses of the universal stress signature, g-aminobutyrate (GABA), and visual symptoms of CA-related injury in apples subjected to elevated CO 2 . Fruit were treated with or without 1-MCP prior to CA [2.5 kPa O 2 , 5 (elevated) or 0.03 (ambient) kPa CO 2 ] storage at either 3 or 208C for up to 24 wk. At 208C, 1-MCP-treated apples displayed symptoms of CA-related injury by 3 wk of elevated CO 2 storage; a similar 15% disorder incidence was apparent by 6 wk in non 1-MCP-treated fruit. A maximal incidence of 30% for this disorder occurred after 24 wk at 38C in fruit held at elevated CO 2 , regardless of 1-MCP treatment. At 208C, GABA levels were 48% higher within 6 wk of the transfer of 1-MCP-treated fruit to elevated CO 2 . At 38C, a 2.6-fold increase in GABA level occurred by week 6 of elevated CO 2 storage, and was maintained for an additional 18 wk thereafter; a similar change in GABA level was apparent in non 1-MCP-treated fruit, albeit delayed until week 18 of storage. These findings indicate that shifts in GABA are associated with the onset of visual symptoms of CA-related injury in 'Honeycrisp' fruit in response to elevated CO 2 , regardless of 1-MCP.Key words: g-aminobutyrate, apple, controlled atmosphere, controlled atmosphere-related injury, 1-methylcylopropene Chiu, G. Z., Shelp, B. J., Bowley, S. R., DeEll, J. R. et Bozzo, G. G. 2015. Les dommages cause´s aux pommes Honeycrisp sous atmosphe`re controˆle´e sont lie´s a`l'accumulation de g-aminobutyrate. Can. J. Plant Sci. 95: 879Á886. Les pommes Honeycrisp (Malus x domestica Borkh.), y compris les fruits traite´s avec du 1-me´thylcycloprope`ne (1-MCP), antagoniste de l'e´thyle`ne, ont parfois leur chair abıˆme´e lors de l'entreposage sous atmosphe`re controˆle´e (AC). Pour mieux comprendre les marqueurs biologiques associe´s a`ce proble`me physiologique, les auteurs ont compare´la re´ponse du g-aminobutyrate (GABA), signature universelle du stress, dans le temps aux symptoˆmes visibles des dommages re´sultant de l'entreposage AC chez les pommes soumises a`une forte concentration de CO 2 . Les fruits ont e´te´traite´s ou pas avec du 1-MCP avant d'eˆtre stocke´s sous AC [2,5 kPa de O 2 , et 5 (pression e´leve´e) ou 0,03 (pression ambiante) kPa de CO 2 ] a`3 ou 20 8C pendant un maximum de 24 semaines. À 20 8C, les pommes traite´es avec du 1-MCP pre´sentaient des signes de dommages associe´s a`l'entreposage CA apre`s trois semaines de stockage sous pression e´leve´e de CO 2 ; une incidence semblable de dommages, e´gale a`15 %, e´tait manifeste chez les fruits non traite´s au 1-MC...
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