FUNCTION OF THE APETALA-1 GENE DURING ARABIDOPSIS FLORAL DEVELOPMENT
FUNCTION OF THE APETALA-1 GENE DURING ARABIDOPSIS FLORAL DEVELOPMENT
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DOI：
10.1105/tpc.2.8.741
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发表时间：
1990-08-01
期刊：
影响因子：
11.6
通讯作者：
SUSSEX, IM
中科院分区：
文献类型：
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作者：
IRISH, VF;SUSSEX, IM
我们已经对拟南芥中隐性同源异型突变体apetala 1 - 1（ap1 - 1）所产生的花的表型进行了特征描述。纯合该突变的植株表现出萼片同源异型转化为苞片，并且在每个转化后的萼片的叶腋处伴随有花芽的形成。此外，这些花没有花瓣。我们表明花瓣表型的缺失是由于花瓣原基未能起始。我们还构建了ap1与其他影响花发育的突变体的双突变组合。基于这些结果，我们认为AP1和apetala 2（AP2）基因可能编码相似的功能，这些功能是确定花器官产生的位置模式以及花分生组织的有限发育所必需的。我们提出AP1和AP2基因产物与agamous（AG）基因座的产物协同作用以建立一个有限的花分生组织，而其他同源异型基因产物是细胞根据其位置正确分化所必需的。这些结果扩展了同源异型基因在花发育中所提出的作用，并为花模式的建立提出了新的模型。
We have characterized the floral phenotypes produced by the recessive homeotic apetala 1-1 (ap1-1) mutation in Arabidopsis. Plants homozygous for this mutation display a homeotic conversion of sepals into bracts and the concomitant formation of floral buds in the axil of each transformed sepal. In addition, these flowers lack petals. We show that the loss of petal phenotype is due to the failure of petal primordia to be initiated. We have also constructed double mutant combinations with ap1 and other mutations affecting floral development. Based on these results, we suggest that the AP1 and the apetala 2 (AP2) genes may encode similar functions that are required to define the pattern of where floral organs arise, as well as for determinate development of the floral meristem. We propose that the AP1 and AP2 genes products act in concert with the product of the agamous (AG) locus to establish a determinate floral meristem, whereas other homeotic gene products are required for cells to differentiate correctly according to their position. These results extend the proposed role of the homeotic genes in floral development and suggest new models for the establishment of floral pattern.