Moreover, except a few clones were expressed predominantly in bract, absolute majority of subtraclive clones were expressed at low level in all checked organs, i.e., bract, leaf and root.

• 用地高辛标记的珙桐苞片、叶片和根的cDNA做探针，与差减杂交所获得克隆的PCR产物的杂交结果表明，有少数基因在这些器官中都是大量表达，而大多数在这些器官里的表达量均很少，除苞片外，一般均检测不到，有部分基因在苞片中优势表达。