title: Identification of xyloglucan endotransglucosylase/hydrolase genes (XTHs) and their expression in persimmon fruit as influenced by 1-methylcyclopropene and gibberellic acid during storage at ambient temperature.
abstract: Xyloglucan endotransglucosylase/hydrolase (XTH) is thought to contribute to fruit softening by degrading xyloglucan that is a predominant hemicellulose in the cell wall. In this study, two full-length XTH genes (DKXTH1 and DKXTH2) were identified from 'Fupingjianshi' persimmon fruit, and the expression level of both XTH genes was investigated during softening for 18-24 d using RT-qPCR. Sequence analysis showed that DKXTH1 and DKXTH2 contained a putative open reading frame of 861 and 876 bp encoding polypeptides of 287 and 292 amino acid residues, respectively, which contained the conserved DEIDFEFLG motif of XTH, a potential N-linked glycosylation signal site. RT-qPCR analysis showed that DKXTH1 and DKXTH2 in untreated fruit had different expression patterns during fruit softening, in which maximum expression occurred on days 3 and 12 of ripening, respectively. 1-Methylcyclopropene (1-MCP) and gibberellic acid (GA(3)) treatments delayed the softening and ethylene peak of persimmon fruit, as well as suppressed the expression of both XTH genes, especially DKXTH1. These results indicated that the expression of both XTH genes might be ethylene dependent action, and closely related to softening of persimmon in the early (DKXTH1) and later (DKXTH2) ripening stages.
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
authors.forename: Qinggang
authors.initials: Q
authors.lastname: Zhu
authors.forename: Zhengke
authors.initials: Z
authors.lastname: Zhang
authors.forename: Jingping
authors.initials: J
authors.lastname: Rao
authors.forename: Donald J
authors.initials: DJ
authors.lastname: Huber
authors.forename: Jingyi
authors.initials: J
authors.lastname: Lv
authors.forename: Yali
authors.initials: Y
authors.lastname: Hou
authors.forename: Kanghua
authors.initials: K
authors.lastname: Song
mesh_terms: D000595:Amino Acid Sequence; D003521:Cyclopropanes / Q000494:pharmacology*; D029788:Diospyros / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D061353:Food Storage; D005638:Fruit / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D005875:Gibberellins / Q000494:pharmacology*; D016695:Glycosyltransferases / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment; D013696:Temperature
chemical_list: D003521:Cyclopropanes; D005875:Gibberellins; D010940:Plant Proteins; C007842:gibberellic acid; D016695:Glycosyltransferases; C473049:xyloglucan - xyloglucosyltransferase; C412563:1-methylcyclopropene