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ISHS Acta Horticulturae 682: V International Postharvest Symposium

ACC SYNTHASE GENES RELATED TO COLD-DEPENDENT RIPENING IN PEAR FRUIT

Authors:   I. El-Sharkawy, J.M. Lelièvre, J.C. Pech, A. Latché
Keywords:   1-aminocyclopropene-1-carboxylic acid (ACC), ACS isoforms, cold requirement, pear fruit ripening
Abstract:
The differential regulation of ACC synthase genes has been studied in pear cultivars that either require a long chilling treatment before they are capable of ripening (‘Passe-Crassane’, PC) or not (‘Old-Home’, OH) and in OH x PC hybrids having no (A16) or intermediate (A50) cold requirement. Among the seven Pc-ACS cDNAs isolated, four of them (Pc-ACS1a/b and Pc-ACS2a/b) showed differential expression in relation with cold requirement. Pc-ACS1a transcripts accumulated specifically during chilling and ripening of cold-dependent cultivars while Pc-ACS1b transcripts were detected only during ripening of cold-independent genotypes. Pc-ACS2a mRNA was expressed specifically in cold-dependent genotypes and negatively regulated by ethylene while Pc-ACS2b transcripts accumulated only in cold-independent genotypes and positively regulated by ethylene. Pc-ACS3, 4 and 5 transcripts accumulation was similar in all genotypes, independently of cold-requirements.
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