Virulence of Fusarium spp. Causing Wilt Disease of Guava with Special Reference to RNAi

Wilt of Psidium guajava L., incited by Fusarium oxysporum f. sp. psidii and Fusarium solani is a serious soil borne disease of guava in India. The erratic spread and occurrence of guava wilt in different areas may be due to variable aggressiveness or virulence of different pathogenic isolates in the soil. Virulent gene related locus viz. Xyl, KHS1, PelA1, PG6/7, CHS1/2 and FMK1/MAPK1 were successfully expressed. This indicates that all the tested Fusarium sp. isolates of guava are having virulence factor in their genome. Since, the Fusarium spp. infecting guava plant were sequence for RNA genes and their expression studies was possibility an outcome of gene silencing techniques based on deletion/insertion of codan at ORF1 and ORF3 loci in the genome of Fusarium spp. responsible for causing wilt disease of guava. Therefore, in present review, an attempt has been made to discuss theses virulence factor in terms of RNAi.