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Title: Sources of Resistance to Pepino Mosaic Virus in Tomato Accessions

Author
item Ling, Kai-Shu
item SCOTT, JOHN - UNIVERSITY OF FL

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/17/2007
Publication Date: 6/1/2007
Citation: Ling, K., Scott, J.W. 2007. Sources of Resistance to Pepino Mosaic Virus in Tomato Accessions. Plant Disease. 91:749-753.

Interpretive Summary: Pepino mosaic virus (PepMV) is an emerging disease in greenhouse tomato. Currently, there is no source of resistance available in the tomato cultivars. A major tomato germplasm core collection (109 accessions) was evaluated for its resistance against PepMV-US, a major type of PepMV in the US. These accessions include 23 Solanum lycopersicum L., 8 S. pimpinellifolium L., 33 S. peruvianum L., 18 S. chilense (Dunal) Reiche, and 27 S. habrochaites Knapp & Spooner. There was no resistance in S. lycopersicum and S. pimpinellifolium to PepMV-US. Two accessions each in S. peruvianum (LA107 and LA1305) and S. chilense (LA1971 and LA2748) appeared to have tolerance. However, the most promising resistant candidates were identified from three S. habrochaites accessions (LA1731, LA2156, and LA2167). The resistant potential from the selected plants were further confirmed in the progenies generated through single plant selection. Interestingly, the selected S. habrochaites plants possessed not only resistance to the US type isolates but also to the European type isolate. This broad spectrum resistance to two major PepMV strains is important as it might provide a durable resistance that can be introgressed into tomato cultivars.

Technical Abstract: Pepino mosaic virus (PepMV) is an emerging disease on greenhouse tomato. This highly contagious disease is not easy to control. The best disease management strategy is likely through the use of disease resistance. A major tomato germplasm core collection was evaluated for its resistance against PepMV. These accessions include 23 Solanum lycopersicum L., 8 S. pimpinellifolium L., 33 S. peruvianum L., 18 S. chilense (Dunal) Reiche, and 27 S. habrochaites Knapp & Spooner. The results showed that all plants in the accessions corresponding to S. lycopersicum and S. pimpinellifolium were susceptible to PepMV-US infection. On the other hand, two accessions of S. peruvianum (LA107 and LA1305) and S. chilense (LA1971 and LA2748) appeared to have some levels of tolerance. However, the most promising resistance was identified in three S. habrochaites accessions (LA1731, LA2156, and LA2167). Resistant plants from these three S. habrochaites accessions were saved for single plant selection. The secondary screening was carried out with progenies generated from the selected plants. Interestingly, the selected S. habrochaites plants were resistant to not only the US type isolate but also the European type isolate. The level of resistance in LA1731 plants to PepMV was very strong, likely immune.