Abstract:

Freezing sections and immunogold-silver staining were employed to the study on the localization of IAA in petioles of Syringa oblata Lind. At different stages of leaf abscission, the distribution patterns of the silver particles varied in different tissues. In the earlier period of abscission, there were many silver particles in the proximal and distal tissues, but only a few in the abscission zone. The high density of silver particles was found in the phloem of the petiole. The number of silver particles in the abscission zone increase immediately after the protective layer was formed and began to decrease along with the development of the abscission zone. The density of the silver particles became very low when abscission was completed. The formation of protective layer may be the demarcation line of the Stage Ⅰ and Stage Ⅱ during the development of the abscission zone.

紫丁香叶柄离区IAA的免疫组织化学定位
王幼群^1,2*  韩 静²  林金星¹

（1. 中国科学院植物研究所，北京100093；2.  中国农业大学生物学院，北京100094）
关键词： 脱落；生长素；免疫组织化学定位；紫丁香