CHARACTERIZATION OF A NEW VARIANT OF APPLE SCAR SKIN VIROID ASSOCIATED WITH PEAR FRUIT CRINKLE DISEASE
A.M. Shamloul, X. Yang, L. Han, A. Hadidi
A new variant of Apple scar skin viroid (ASSVd) was isolated from Chinese pear with fruit crinkling symptoms. The pear fruit crinkle variant of ASSVd is 333 nucleotides in length and shows 95% identity with ASSVd prototype. It also shows 92% and 98% identity with the viroid variants associated with pear rusty skin disease in China and pear fruit dimple disease in Japan, respectively. This viroid was detected in all fruit crinkle-diseased samples examined. Pear blister canker viroid (PBCVd) was detected in less than 20% of the same diseased samples. The Chinese variant of PBCVd is 315 nucleotides in length and shows 97% identity with PBCVd prototype.