EXPRESSION OF THE ARABIDOPSIS FLORAL HOMEOTIC GENE AGAMOUS IS RESTRICTED TO SPECIFIC CELL-TYPES LATE IN FLOWER DEVELOPMENT
EXPRESSION OF THE ARABIDOPSIS FLORAL HOMEOTIC GENE AGAMOUS IS RESTRICTED TO SPECIFIC CELL-TYPES LATE IN FLOWER DEVELOPMENT
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DOI：
10.1105/tpc.3.8.749
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发表时间：
1991-08-01
期刊：
影响因子：
11.6
通讯作者：
MEYEROWITZ, EM
中科院分区：
文献类型：
--
作者：
BOWMAN, JL;DREWS, GN;MEYEROWITZ, EM
AGAMOUS（AG）基因的突变引起拟南芥花的两个相邻轮生中的转化。 花瓣在第三轮花中发育，而不是在正常的雄蕊中发育，通常发育成第四轮雌蕊群的细胞表现得就像它们构成了一个小花原基。 在花发育早期，AG RNA均匀分布在整个第三和第四轮器官原基，但不存在于第一和第二轮器官原基。 与早期表达模式相反，在花发育后期，AG RNA仅限于雄蕊和心皮内的特定细胞类型，因为这些器官中发生细胞分化。 花同源异型基因APETELA2（AP2），它调节早期AG表达的花突变体中的异位AG表达模式，表明后期AG表达不直接依赖于AP2活性。
Mutations in the AGAMOUS (AG) gene cause transformations in two adjacent whorls of the Arabidopsis flower. Petals develop in the third floral whorl rather than the normal stamens, and the cells that would normally develop into the fourth whorl gynoecium behave as if they constituted an ag flower primordium. Early in flower development, AG RNA is evenly distributed throughout third and fourth whorl organ primordia but is not present in the organ primordia of whorls one and two. In contrast to the early expression pattern, later in flower development, AG RNA is restricted to specific cell types within the stamens and carpels as cellular differentiation occurs in those organs. Ectopic AG expression patterns in flowers mutant for the floral homeotic gene APETELA2 (AP2), which regulates early AG expression, suggest that the late AG expression is not directly dependent on AP2 activity.