1Peerbolte R,Leenhouts K,Hooykaas-van Slogteren G M S,et al.Clonefrom a shooty tobacco crown gall tumor II:irregular T-DNA structures and organizationT-DNA,methylation and conditional expression of opine genes.Plant Mol Bio,1986,7:285-299.
3Codón A C,Lee Y S,Russo V E A.Novel pattern of DNAmehylation in Neurospora crassa transgenic for the foreign gene hph.Nucleic AcidsResearch,1997，25(12)：2409-2416.
4Nan X,Ng H H,Johnson C A,et al.Transcriptional repression by the methyl CpG-bindingprotein MeCP2 involves a histone deacetylase complex,Nature,1998,393:386-389.
5Pazin M J,Kadonaga J T.What’s up and down with histone deacetylation andtranscription?Cell,1997,89:315-328.
6Kumpatla S P,Teng W M,Buchholz W C,et al.Epigenetic transcriptional silencing and5-azacytidinemediated reactivation of a complex transgene in rice,PlantPhysiology,1997,115:361-373.
7Van Houdt H,Ingelbrecht I,Van Montagu M,et al.Post-transcriptional silencing of aneomycin phosphotransferase Ⅱ transgene correlates with the accumulation of unproductiveRNAs and with increase cytosine methylation of 3’flanking regions,PlantJ,1997,12(2):379-392.
8Diéguez M J,Vaucheret H,Paszkowski J,et al.Cytosinemethylation at GG and CNG sites is not a prerequisite for the initiation oftranscriptional gene silencing in plants,but it is required for its maintenace,Mol GenGenet,1998,259:207-215.
9Assaad F F,Tucker K L,Signer E R,Epigenetic repeat-induced gene silencing (RIGS) inArabidopsis.Plant Mol Bio,1993,22:1067-1085.
10Matzke M A,Matzke A J M.Gene interactions and epigenetic variation in transgenicplants.Dev Genet,1990,11:214-223.
