Variation in the resistance of Japanese soybean cultivars to Phytophthora root and stem rot during the early plant growth stages and the effects of a fungicide seed treatment
Autor: | Jun-ichi Matsuoka, Hajime Akamatsu, Sunao Ochi, Masayasu Kato, Genki Mimuro, Mami Takahashi |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
0106 biological sciences
Glycine max partial resistance Biology Plant disease resistance lcsh:Plant culture 01 natural sciences chemistry.chemical_compound chemical control zoospore Phytophthora sojae lcsh:SB1-1110 Cultivar fungi Sowing food and beverages biology.organism_classification Fungicide 010602 entomology Horticulture chemistry Seed treatment Rps gene Phytophthora Stem rot Agronomy and Crop Science 010606 plant biology & botany Research Article |
Zdroj: | The Plant Pathology Journal, Vol 35, Iss 3, Pp 219-233 (2019) The Plant Pathology Journal SC10202005290002 NARO成果DBd |
ISSN: | 1598-2254 |
Popis: | Soybean cultivars susceptible to Phytophthora root and stem rot are vulnerable to seed rot and damping-off of seedlings and young plants following an infection by Phytophthora sojae. In this study, the disease responses of Japanese soybean cultivars including currently grown main cultivars during the early growth stages were investigated following infections by multiple P. sojae isolates from Japanese fields. The extent of the resistance to 17 P. sojae isolates after inoculations at 14, 21, and 28 days after seeding varied significantly among 18 Japanese and two US soybean cultivars. Moreover, the disease responses of each cultivar differed significantly depending on the P. sojae isolate and the plant age at inoculation. Additionally, the treatment of 'Nattosyo-ryu' seeds with three fungicidal agrochemicals provided significant protection from P. sojae when plants were inoculated at 14-28 days after seeding. These results indicate that none of the Japanese soybean cultivars are completely resistant to all tested P. sojae isolates during the first month after sowing. However, the severity of the disease was limited when plants were inoculated during the later growth stages. Furthermore, the protective effects of the tested agrochemicals were maintained for at least 28 days after the seed treatment. Japanese soybean cultivars susceptible to Phytophthora root and stem rot that are grown under environmental conditions favorable for P. sojae infections require the implementation of certain practices, such as seed treatments with appropriate agrochemicals, to ensure they are protected from P. sojae during the early part of the soybean growing season. |
Databáze: | OpenAIRE |
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