Mechanisms regulating bitter pit development in Greensleeves apples with suppression of ethylene biosynthesis.
The 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.
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Parte de livro biblioteca |
| Language: | English eng |
| Published: |
2015-07-24
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| Subjects: | ACCO, ACCS, Desordem fisiológica, Apple, Physiological disorder., Maçã, Cálcio, Distúrbio Fisiológico, Malus Domestica., bitter pit., |
| Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/1020458 |
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