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  • Title: Delay expression of limonoid UDP-glucosyltransferase makes delayed bitterness in citrus.
    Author: Zaare-Nahandi F, Hosseinkhani S, Zamani Z, Asadi-Abkenar A, Omidbaigi R.
    Journal: Biochem Biophys Res Commun; 2008 Jun 20; 371(1):59-62. PubMed ID: 18407832.
    Abstract:
    Genes encoding limonoid UDP-glucosyltransferase from albedo of six Citrus species with different levels of delayed bitterness are isolated and cloned in vector pTZ57R/T. Our results indicate that gene sequence of sweet lime (with intense juice delayed bitterness) have complete identity with Satsuma mandarin (without distinctive juice delayed bitterness). Also gene sequence of Marsh seedless grapefruit, local orange and Thompson navel orange (with mild juice delayed bitterness) have very similarity with Satsuma mandarin. On the other hand, this gene started to express 60, 120, and 210 days after full blooming in albedo of Satsuma mandarin, sweet oranges and sour orange, and both grapefruit and sweet lime, respectively. Expression pattern of limonoid glucosyltransferase gene in leaves was quite different with albedo. Thus, we supposed the delayed bitterness in this species was related to delay in expression of limonoid glucosyltransferase gene in albedo and lower limonoid glucoside accumulation in fruits.
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