1Semancik J S,Weathers L G. Exocortis disease: evi- dence for a new species of "infectious" low molecular weight RNA in plants[J]. Nature New Biology, 1972,237 : 242-244.
3Sakai A,Kobayashi S,Oiyama I. Cryopreservation of nucellar cells of navel orange ( Citrus sinensis Osb. var. brasiliensis Tanaka) by vitrification[J]. Plant Cell Reports,1990,9(1): 30-33.
6Navarro L,Jflarez J, Ballester J F, et al. Elimination of some citrus pathogens producing psorosis-like leaf symptoms, by shoot-tip grafting in vitro [-C]//Cala- van E C,Gamsey S M,Timmer L W. Proceedings of the eithth conference of the International Organiza- tion of Citrus Virologists, 1980:162-166.
10Brison M, Boucaud M T, Pierronnet A, et al. Effect of cryopreservation on the sanitary state of a ev Prunus rootstock experimentally contaminated with Plum Pox Potyvirus[-J-]. Plant Sei, 1997,123 .. 189-196.
