Krizek B A, Prost V, Macias A
Department of Biological Sciences, University of South Carolina, Columbia, South Carolina 29208, USA.
Plant Cell. 2000 Aug;12(8):1357-66. doi: 10.1105/tpc.12.8.1357.
The Arabidopsis AINTEGUMENTA (ANT) gene has been shown previously to be involved in ovule development and in the initiation and growth of floral organs. Here, we show that ANT acts in additional processes during flower development, including repression of AGAMOUS (AG) in second whorl cells, promotion of petal epidermal cell identity, and gynoecium development. Analyses of ap2-1 ant-6 double mutants reveal that ANT acts redundantly with AP2 to repress AG in second whorl cells. The abaxial surface of ant petals contains features such as stomata and elongated, interdigitated cells that are not present on wild-type petals. The loss of petal identity in these second whorl cells does not result from ectopic AG expression, suggesting that ANT acts in a pathway promoting petal cell identity that is independent of its role in repression of AG. These data suggest that ANT may function as a class A gene.
拟南芥的AINTEGUMENTA（ANT）基因先前已被证明参与胚珠发育以及花器官的起始和生长。在此，我们表明ANT在花发育的其他过程中发挥作用，包括在第二轮细胞中抑制AGAMOUS（AG）、促进花瓣表皮细胞特性以及雌蕊发育。对ap2-1 ant-6双突变体的分析表明，ANT与AP2在第二轮细胞中抑制AG时发挥冗余作用。ant花瓣的远轴表面具有一些特征，如气孔以及野生型花瓣上不存在的细长、相互交错的细胞。这些第二轮细胞中花瓣特性的丧失并非由异位AG表达导致，这表明ANT在促进花瓣细胞特性的途径中发挥作用，该途径独立于其在抑制AG中的作用。这些数据表明ANT可能作为A类基因发挥作用。
