Resistance Tests and Genetic Resources for Breeding Fusarium Root Rot Resistant Lettuce
| Autor: | Hideki Ogiso, Nobuaki Tsuchiya, Motohisa Tsukada, Masashi Fujinaga, Tomita Usui |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Engei Gakkai zasshi. 73:105-113 |
| ISSN: | 1880-358X 0013-7626 |
| Popis: | Using a method for testing a varietal resistance of lettuce to fusarium root rot, we evaluated the resistance of genetic resources of lettuce gathered from Japan and abroad as an aid to our breeding progrom. Seeds were sown in a mixture of nursery soil of pathogenic fungus-cultured bran and vermiculite (bran:vermiculite = 1:1.5, v/v) and commercial horticultural nursery soil (mixing ratio: 1/10∼1/40, w/w), that included more than 108 cells per ml of Fusarium oxysporum f. sp. lactucae. The seeded plug trays with the inoculated soil were kept for 30 to 40 days at 15 °C to 35 °C (mean of 25 °C ) in a glasshouse under natural daylength. At the end of incubation period, seeding were indexed for resistance to fusarium root rot. Resistance tests were conducted on 78 accessions of genotypes from Japan, and 77 accessions which were mainly crisp-type lettuce gathered from abroad between 1999 and 2000. Regardless of the sources of these genotypes, large differences were seen in disease severity among the genotypes. Among those from Japan, many of the 'Vanguard' type varieties possessed more resistance to isolate SB1-1 (Race 1) and 'V Lettuce' were highly resistance to isolate SB1-1, whereas 'Empire' types, 'Kikugawa 102' and 'Blizzard'were highly susceptible. However, many 'Vanguard' type varieties, 'V Lettuce' were highly susceptible to isolate F9501 (Race 2). while 'Kikugawa 102' and 'Blizzard' possessed highly resistance to isolate F9501. Compared to those genetic resources gathered from Japan, a larger number of materials from abroad showed resistance. 'Batavia Tezier' and 'Batavia Blonde de Paris' tested to be resistant to both SB1- 1 and F9501. |
| Databáze: | OpenAIRE |
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