テンサイそう根病汚染土壌における野生エンバクおよびテンサイ品種の栽培が本病媒介菌Pozymyxa betaeの菌数に及ぼす影響

抄録

The objective of this study is to evaluate the effect on change in the population of Polymyxa betae, a BNYVV vector, by the cultivation of wild oats and resistant and susceptible sugar beet cultivars. The viruliferous population of P. betae in infested soil cultivated for 9 months by wild oats was 0.18 infection units per gram (IU), 0.43 IU in resistant and 5.22 IU in susceptible sugar beet cultivars, and 0.36 IU where no plants were cultivated. IU was significantly reduced by wild oat cultivation and increased by susceptible sugar beet cultivar cultivation compared to no planting. IU after resistant cultivar cultivation was the same as no planting. The number of P. betae sporesori using direct observation microscopy from infested soil cultivated with sugar beet cultivar were 3 times as great as wild oats and no planting. The rate of empty resting spores treated with root exudates of wild oats and sugar beet for 21 and 37 days was higher than in distilled water treatment.