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Breeding for resistance to soybean dwarf virus sdv v. degree of resistance of a new variety tsurukogane



Breeding for resistance to soybean dwarf virus sdv v. degree of resistance of a new variety tsurukogane



Bulletin of Hokkaido Prefectural Agricultural Experiment Stations (56): 83-92



Soybean dwarf disease causes a great decrease of yield in Hokkaido [Japan] and so a new variety "Tsurukogane" was developed by crossing "Ohoju" (high resistance to SDV) and "Chuuiku I" (good quality) for resistance to soybean dwarf virus (SDV). The resistant variety "Tsurukogane" was compared to two susceptible varieties "Kitahomare" and "Yuuzuru" on the infection time, disease development and yield loss with both natural infection and artificial inoculation methods. Natural inoculation fields were located at Biratori and Date in Hokkaido, where SDV occurs severely. Artificial inoculation was performed by using viruliferous aphids (Acyrthosiphon solani Kaltenbuch) with two strains (dwarfing and yellowing) of SDV in the field at Naganuma. In Biratori field, 96.4% of plants investigated were diseased on "Kitahomare", whereas 35.9% on "Tsurukogane". In Date field, 52.9% of plants investigated were diseased on "Yuuzuru" whereas 23.0% on "Tsurukogane". It was clear that this variety was resistant to the virus infection. Symptoms of the disease appeared mostly in middle July to late July on the susceptible varieties, and in early August on "Tsurukogane". The damage of plants diseased earlier was much more severe in both methods, especially the yield of soybean plants which became diseased before flowering time decreased greatly. With artificial inoculation, the seed weight of the susceptible varieties showed a decrease of 83 to 84% as compared to non-inoculated plants as control, whereas that of the resistant "Tsurukogane" did a decrease of 57%. These results indicate that the new variety "Tsurukogane" is moderately resistant to SDV.

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