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Field evaluation of resistance to kernel infection and mycotoxin accumulation caused by Fusarium head blight in western Japanese wheat (Triticum aestivum L.) cultivars
Authors:Katashi Kubo  Naoyuki Kawada  Takashi Nakajima  Kazuyuki Hirayae  Masaya Fujita
Institution:1. Lowland Farming and Horticulture Research Division, Kyushu Okinawa Agricultural Research Center (KARC), National Agriculture and Food Research Organization (NARO), 496 Izumi, Chikugo, Fukuoka, 833-0041, Japan
2. Agricultural Radiation Research Center, NARO Tohoku Agricultural Research Center (TARC), 50 Harajukuminami, Arai, Fukushima, 960-2156, Japan
3. Agro-Environment Research Division, NARO/KARC, 2421 Suya, Koshi, Kumamoto, 861-1192, Japan
4. NARO Headquarters, 3-1-1 Kannondai, Tsukuba, Ibaraki, 305-8517, Japan
5. Ministry of Agriculture, Forestry and Fisheries of Japan, 1-2-1 Kasumigaseki, Chiyoda, Tokyo, 100-8950, Japan
6. Wheat and Barley Research Division, NARO Institute of Crop Science, 2-1-18 Kannondai, Tsukuba, Ibaraki, 305-8518, Japan
Abstract:Fusarium head blight (FHB) remains a serious problem that causes yield and grain quality losses, and mycotoxin accumulation in wheat production in western Japan. A 3-year field trial with artificial FHB inoculation was conducted to evaluate varietal characteristics of FHB resistance among 31 wheat cultivars/lines cultivated in western Japan, including one standard line. Severity of FHB, frequency of Fusarium-damaged kernels (FDK), deoxynivalenol concentration (DON), nivalenol concentration (NIV), and grain yield showed significant differences among years and among cultivars/lines. Interaction between years and cultivars/lines was also significant in these traits, but F values were larger for cultivars/lines than for the interaction. Correlation analysis showed that cultivars/lines with lower FHB severities tended to have lower FDK, DON and NIV, and a higher yield. Resistance to kernel infection (RKI), residuals calculated by regressing FDK against FHB severity, and resistance to mycotoxin accumulation (RTA), residuals calculated by regressing DON + NIV against FDK, also differed significantly among cultivars/lines. These results indicated that varietal differences in response to FHB symptom development, RKI and RTA exist among wheat cultivars/lines in western Japan. Such information is important to aid producers in controlling the disease and for breeders to improve FHB resistance and reduce mycotoxin accumulation in commercial wheat cultivars.
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