Studies on seed transmission of four pospiviroids in horticultural plants
Seed transmission of four pospiviroids: Potato spindle tuber viroid (PSTVd – EPPO A2 List), Tomato chlorotic dwarf viroid (TCDVd), Tomato apical stunt viroid (TASVd) and Columnea latent viroid (CLVd) has been studied in Japan on several horticultural plants.
The rate of seed transmission of PSTVd-infected tomato plants (Solanum lycopersicum) to progeny seedlings varied among the studied tomato cultivars from 0 to 90.2%. Seed transmission rates of PSTVd obtained for other plants were as follows: 0.3-0.5% in Capsicum annuum, 1.2% in Glebionis coronaria and 81% in Petunia x hybrida ‘Mitchell’. The distribution of PSTVd within tomato seed tissues has been investigated and it was found that this viroid is present in the embryo and endosperm.
In the case of TCDVd and CLVd, transmission rates were 25% in Petunia x hybrida ‘Mitchell’ and 5.3-100% in tomato, respectively. No seed transmission was obtained for TASVd on the studied plant species (S. lycopersicum, Glebionis coronaria and Tagetes patula), although it is noted that seed transmission has been obtained in tomato by other researchers.
Sources
Matsushita Y, Tsuda S (2016) Seed transmission of Potato spindle tuber viroid, Tomato chlorotic dwarf viroid, Tomato apical stunt viroid, and Columnea latent viroid in horticultural plants. European Journal of Plant Pathology 145(4), 1007-1011.