因此，遗传育种学家致力于不断挖掘新抗源，利用新的优异抗病基因以提高宿主的抗病能力及抗性持久性。
So, breeders bend themselves to mining new resistant resource, apply new elite resistant genes to improve the resistance of rice.
因此，确定影响抗性持久性的各种因子，形成育种策略以增加抗性的持久性成为近50年来植物病理学研究的首要目的。
Understanding the factors that affect the durability of resistance and devising strategies to increase durability have been primary goals in plant pathology research over the last 50 years.
然而，由于大豆疫霉菌小种的高度变异性导致品种抗性极易丧失，挖掘持久性抗病基因已成为抗病育种的难题。
However, the resistance of cultivars is easily loss due to the high genetic variability of isolates. Mining durable resistance genes has become a key problem in disease resistant breeding.
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