Molecular characterization of an ethylene receptor gene (CcETR1) in coffee trees, its relationship with fruit development and caffeine content

Molecular characterization of an ethylene receptor gene (CcETR1) in coffee trees, its relationship with fruit development and caffeine content Bustamante Porras J. auteur aut IRD Campa Claudine auteur aut IRD Poncet Valérie auteur aut IRD Noirot Michel auteur aut IRD Leroy T. auteur aut IRD Hamon Serge auteur aut IRD de Kochko Alexandre auteur aut IRD text journalArticle eng text/pdf born digital access To understand the importance of ethylene receptor genes in the quality of coffee berries three full-length cDNAs corresponding to a putative ethylene receptor gene (ETR1) were isolated from Coffea canephora cDNA libraries. They differed by their 3'UTR and contained a main ORF and a 5'UTR short ORF putatively encoding a small polypeptide. The CcETR1 gene, present as a single copy in the C. canephora genome, contained five introns in the coding region and one in its 5'UTR. Alternative splicing can occur in C. canephora and C. pseudozanguebariae, leading to a truncated polypeptide. C. pseudozanguebariae ETR1 transcripts showed various forms of splicing alterations. This gene was equally expressed at all stages of fruit development. A segregation study on an inter-specific progeny showed that ETR1 is related to the fructification time, the caffeine content of the green beans, and seed weight. Arabidopsis transformed etiolated seedlings, which over-expressed CcETR1, displayed highly reduced gravitropism, but the triple response was observed in an ethylene enriched environment. These plants behaved like a low-concentration ethylene-insensitive mutant thus confirming the receptor function of the encoded protein. This gene showed no induction during the climacteric crisis but some linkage with traits related to quality. specialized coffee ethylene receptors caffeine content fruit ripening intron splicing overexpression 076 Molecular Genetics and Genomics 277 6 701-712 2007 1617-4615 https://www.documentation.ird.fr/hor/fdi:010040594 10.1007/s00438-007-0219-z 1617-4615 [F B010040594] https://www.documentation.ird.fr/hor/fdi:010040594 https://www.documentation.ird.fr/intranet/publi/2007/07/010040594.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2007-08-06 2017-08-23 fdi:010040594 fre