供试菌随寄主植物的改变，侵染能力及所建立的共生系统固氮活性有所降低。
If the original host plant was replaced by others, both these Frankia 'infective ability and nitrogenase activity in new symbiotic system were lower.
病原体必须逃过宿主免疫系统的重重防御，直至能够在宿主细胞内复制及扩散到其它细胞中，才算侵染成功。
To be successful, a pathogen must escape the many defenses of the host immune system until it can replicate and spread to another host.
植物系统获得抗性(SAR)，是植物受到病原菌侵染后所激发的一种防卫反应。
Systemic acquired resistance (SAR), known as broad-spectrum, inducible plant immunity, is a defense response triggered by pathogen infection.
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