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Since the leaf blight of rice colony type and virulence variation of


Different (Table 3). In Table 3 different media and mutant Ha Yan virulence drop off music Table3MediaofX. c. pvo7yzeonmutanttypecoloniesandthevirulenceofthestrains disease before transplantation of a j medium VirulencebeforeMediasubculture (cm) transplanted mutant colonies Chan Aftersubculture virulence MutaRttypeVitulertceco1. (Ah) (em) Table 4 and the generation of polysaccharide Yan pension off the relationship between type of ugly virulence Table4SlimepolysaccharideproductionofX. c. pv. orynaeoncolonytypesandvirulenceofthestrains strains and virulence of colony types of seedlings off. colon P and Wakimo-to's medium, the frequency of mutant colonies high virulence decline is also faster .2.2. e the amount of polysaccharide produced colony types with startling force caused by the relationship G Abstract The results showed that different types of polysaccharide produced by the colony volume with no rules to follow virulence (Jude 4) .3 blight fungus colonies discussed the distinction between types, some based on the color of the colony ��distinction. However, this experiment showed that the color of the colony type only as a parameter, especially in the intermediate colonies, the color is very unstable,[link widoczny dla zalogowanych], which Tsuchiya et al (1982), consistent with the results. The amount of polysaccharide production and virulence of colony types and no rules to follow, so we mainly the growth rate of colony, texture,[link widoczny dla zalogowanych], transparency and color,[link widoczny dla zalogowanych], and end table virulence into account, they are divided into the wild type, mutant and the question type. In addition, we also found that some strains, the colony shape of mutant,[link widoczny dla zalogowanych], but their virulence is like the wild type, which may be due to malnutrition (medium is too dry, too little or inadequate nutrition), or by other antagonistic bacteria adverse effects and other interference factors, and toxic changes in genetic material, the reason yet. Intermediate is actually a cross between wild type and mutant type between them and non-toxic strains in the colony characteristics PXO101 have similarities, but there are transformed to the phenomenon of wild-type colony. Data suggest the emergence of mutant colonies with decreased virulence have a certain relationship, generally the more mutant colonies appear, the more obvious decline in its virulence, which chio et al (1981) was similar to the results. However, different strains of mutant colonies produced a big difference. In some strains the frequency of mutant colonies is very low, even when not detected, can be found in the phenomenon of decreased virulence, which is related with the intermediate or by other causes yet to be discussed. The results show that the selection of wild-type bacteria, using appropriate preservation methods to reduce the number of transplantation, extended graft interval, the choice of appropriate media can play to reduce the generation of mutant colonies, slow decline in the role of virulence. �� BIBLIOGRAP Choi. IEetaj. Ann. Phytopath. Soc. Japarl, 98L; 47:244 ~ 251Dath. APla1. IndianPhytopath. 1982I35: 456 ~ 460Goto. Meta1. Bul1. FacAgrie. ShizuokaUIlix,. 1967I | 7:27 ~ 30Nwigwe. C. plantDis. Reporterl973: 57:95 S ~ 9S6Ou. SH. RiceDiseasesCAB. 1985,[link widoczny dla zalogowanych], P66 ~ 67Fan. CDResear ~ hMethodeinPlantpathology,�� 979:71 Be Hung MA. BangladeshI. Bot. t975} 4Il25 ~ 128IRRI. Stand ~ dEvaluationSystemfarRlce. 1980, IRRI25Choi. EetajAnnPhytopath. Soe. Jap8n, i982I48} i ~ 8
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