5Tabler M,Günther I,Kern R,et al.A microscale procedure for isolating and sequencing the viroid RNA present in one gram of infected leaf tissue[J].J Virol Methods,1989,23(2):111-126.
6Navarro B,Flores R.Chrysanthemum chlorotic mottle viroid:unusual structural properties of a subgroup of self-cleaving viroids with hammerhead ribozymes[J].Proc Natl Acad Sci U S A,1997,94(21):11262-11267.
7Li S F,Onodera S,Sano T,et al.Gene diagnosis of viroids:comparisons of return-PAGE and hybridization using DIG-labeled DNA and RNA probes for practical diagnosis of hop stunt,citrus exocortis and apple sear skin viroids in their natural host plants[J].Ann Phytopathol Soc Jpn,1995,61:381-390.
8Yang X C,Yie Y,Zhu F,et al.Ribozyme-mediated high resistance against potato spindle tuber viroid in transgenic potatoes[J].Proc Natl Acad Sci U S A,1997,94(10):4861-4865.
10Singh R P,Boucher A.Comparative detection of mild strains of po-tato spindle tuber viroid from dormant potato tubers by return-polyacrylamide gel electrophoresis and nucleic acid hybridization[J].Potato Res,1988,31(1):159-166.
