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  • Title: Identification of cold acclimated genes in leaves of Citrus unshiu by mRNA differential display.
    Author: Lang P, Zhang CK, Ebel RC, Dane F, Dozier WA.
    Journal: Gene; 2005 Oct 10; 359():111-8. PubMed ID: 16125877.
    Abstract:
    Citrus unshiu is freeze tolerant to -10 degrees C when fully acclimated after exposure to cold, nonfreezing temperatures. To gain an understanding of its cold tolerance mechanism, mRNA differential display reverse transcriptase polymerase chain reaction (DDRT-PCR) and quantitative relative RT-PCR were used to study gene expression under a gradual cold-acclimation temperature regime. Six up-regulated and two down regulated genes were identified based on their amino acid sequences. The identified proteins encoded by the up-regulated genes were: 14-3-3 protein, 40S ribosomal protein S23, putative 60S ribosomal protein L15, nucleoside diphosphate kinase III protein, regulator of chromosome condensation-like protein, and amino acid permease 6. The proteins encoded by the two down-regulated genes were: miraculin-like protein and beta-galactosidase. Their individual function has been briefly reviewed based on published information. In addition to the findings in this study, we compared the function of cold responsive genes of Poncirus trifoliata, a very cold hardy relative of Citrus species that is freeze tolerant to -30 degrees C when fully acclimated, to the function of genes in the current study.
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