| the termini of a new citrus viroid contain duplications of the central conserved regions from two viroid groups. | a citrus viroid associated with dwarfing, cvdiiia, has been sequenced and its 294 nucleotide residues can be arranged to form the typical rod-like secondary structure of other viroids with 71% of nucleotides base-paired. cvdiiia has greatest sequence similarity with apple scar skin viroid (assvd; 69%) and has the central sequence which is conserved in the assvd group. cvdiiia is the smallest member of the assvd group but contains the terminal conserved region shared by all viroids over 300 nucle ... | 1995 | 7828732 |
| nucleotide sequence and structural features of the group iii citrus viroids. | the nucleotide sequence and secondary structure of two representative variants from the group iii citrus viroids. cvd-iiia (297 bases) and cvd-iiib (294 bases) were determined. the variants are related to the apple scar skin viroid (assvd) family. although smaller in size than any of the assvd-related viroids, the central conserved region as well as most of the terminal conserved region of assvd is retained. the rod-like structural configuration (characteristic of assvd) of the variants as predi ... | 1994 | 7996150 |
| both point mutation and rna recombination contribute to the sequence diversity of citrus viroid iii. | field-grown citrus trees often harbor complex mixtures of 4-5 different viroid species, and the presence of citrus viroid iii (cvd-iii) has been shown to reduce the rate of tree growth without inducing disease. to more fully define the structure of its quasi-species, we have examined nine citrus viroid complexes for the presence of previously undescribed sequence variants of cvd-iii. analysis of 86 full-length cdnas generated from these nine viroid complexes by rt-pcr revealed the presence of 20 ... | 2000 | 10949952 |