01961nam a2200277 a 450000100080000000500110000800800410001910000220006024501150008226004030019730000130060052008500061365000110146365000150147465000120148965000280150165000110152965000200154065300090156065300090156965300100157865300260158865300270161470000230164170000190166420204582023-12-26       2015    bl uuuu     u00u1 u    #d1 aFREITAS, S. T. de  aMechanisms regulating bitter pit development in Greensleeves apples with suppression of ethylene biosynthesis.  aIn: CONGRESSO BRASILEIRO DE PROCESSAMENTO MÍNIMO E PÓS COLHEITA DE FRUTAS, FLORES E HORTALIÇAS, 1.; SIMPÓSIO BRASILEIRO DE PÓS-COLHEITA, FRUTAS, HORTALIÇAS E FLORES, 5.; ENCONTRO NACIONAL SOBRE PROCESSAMENTO MÍNIMO DE FRUTAS E HORTALIÇAS, 8., 2015, Aracaju. Avanço na conservação e qualidade de frutas, flores e hortaliças: anais. Aracaju: Universidade Federal de Sergipe: Embrapac2015  c1 CD-ROM  aThe objectives of this study were to understand the role of ethylene and nutrients (Ca2+,Mg2+, K+ and N) on bitter pit (BP) development in wild type (GS) and ethylene suppressed (68G and 103Y) Greensleeves apples. The transgenic line 68G is suppressed for 1-aminocyclopropane-1-carboxylic acid (ACC) oxidase (ACO) and line 103Y is suppressed for ACC synthase (ACS). Suppression of ethylene biosynthesis reduced BP incidence and severity. Lower ethylene biosynthesis, in ethylene-suppressed genotypes, had no effect on Ca2+, Mg2+, K+ and N concentrations in fruit cortical tissue. In all genotypes, fruit with BP had lower Ca2+ and higher Mg2+ concentrations and higher Mg2+/Ca2+ ratio in cortical tissue. The results indicate that high levels of ethylene biosynthesis and Mg2+ in cortical tissue can enhance fruit susceptibility to BP incidence.  aApples  aBitter pit  aCálcio  aDistúrbio Fisiológico  aMaçã  aMalus Domestica  aACCO  aACCS  aApple  aDesordem fisiológica  aPhysiological disorder1 aAMARANTE, C. V. T.1 aMITCHAM, E. J.