对转基因库安托杨及银腺杂种杨(含1～5个外源基因)中选择标记基因新霉素磷酸转移酶基因(N PT II)进行PCR扩增,证实该基因稳定存在于转基因杨树的基因组中。应用酶联免疫吸附测定法( EL ISA)对2种转基因杨树中NPTII蛋白的表达量进行定量检测,结果显示:NPTII蛋白的表达量并没有随着目的基因数量的增加而升高,说明与转单个基因杨树相比,转多个基因杨树可能由标记基因引起的生物安全问题并不会加剧。
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