Somatic Hybrids Between Potato and S. berthaultii Show Partial Resistance to Soil-Borne Fungi and Potato Virus Y.

Autor: Nouri‐Ellouz, Oumèma, Triki, Mohamed Ali, Jbir‐Koubaa, Rania, Louhichi, Assawer, Charfeddine, Safa, Drira, Noureddine, Gargouri‐Bouzid, Radhia
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Zdroj: Journal of Phytopathology; Aug2016, Vol. 164 Issue 7/8, p485-496, 12p
Abstrakt: Three tetraploid somatic hybrid lines produced by protoplast fusion between a dihaploid potato, Solanum tuberosum, cultivar BF15 and the wild potato species Solanum berthaultii were evaluated here for their response to different soil-borne pathogens, that is Fusarium solani, Pythium aphanidermatum and Rhizoctonia solani as well as to infection by potato virus Y ( PVY). Both hybrid and BF15 plants grown in vitro were inoculated with the tested pathogen strains, that is R. solani, P. aphanidermatum, or F. solani. The growth level and disease severity index of these plants were compared to the susceptible commercial cultivar Spunta. A better growth of inoculated hybrid plants and restricted disease symptoms were observed in comparison with the commercial plants. Under glasshouse conditions and after inoculation with R. solani and P. aphanidermatum, improved resistance of the hybrid plants to these pathogens was confirmed. Indeed, these plants showed no significant damage following inoculation and a better development in R. solani-infected plants. The susceptibility of the hybrid tubers to R. solani, P. aphanidermatum, and to F. solani infection was also determined. A significant reduction of tissue colonisation was observed in all the hybrid lines compared to the cultivated cultivars. The STBc and STBd hybrids also showed improved resistance to the PVY ordinary strain ( PVYo) under glasshouse conditions. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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