Incorporation of a selectable marker gene during chloroplast genetic transformation is essential to obtain transformed chloroplasts, which is the same as nuclear transformation.
与核遗传转化相同，叶绿体遗传转化研究需要有合适的选择标记作为辅助手段。
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Chloroplast DNA is vastly more abundant than nuclear DNA, since each plant cell can have thousands of copies of chloroplast genes but just two to four copies of each nuclear gene.