GENES DIRECTING FLOWER DEVELOPMENT IN ARABIDOPSIS
GENES DIRECTING FLOWER DEVELOPMENT IN ARABIDOPSIS
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DOI：
10.1105/tpc.1.1.37
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发表时间：
1989-01-01
期刊：
影响因子：
11.6
通讯作者：
MEYEROWITZ, EM
中科院分区：
文献类型：
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作者：
BOWMAN, JL;SMYTH, DR;MEYEROWITZ, EM
我们描述了四种隐性同源异型突变的影响，这些突变特异性地破坏了拟南芥花的发育。每一种隐性突变都会影响器官发育的结果，但不影响器官原基的位置。观察到的同源异型转变如下：在agamous - 1突变体中，雄蕊转变为花瓣；在apetala2 - 1突变体中，萼片转变为叶片，花瓣转变为类似雄蕊的花瓣；在apetala3 - 1突变体中，花瓣转变为萼片，雄蕊转变为心皮；在pistillata - 1突变体中，花瓣转变为萼片。此外，其中两种突变（ap2 - 1和pi - 1）导致器官缺失，并且ag - 1导致通常会形成雌蕊的细胞分化为一朵花。其中两种突变对温度敏感。温度转换实验表明，野生型AP2基因产物在原基起始时起作用；AP3基因产物在稍后起作用。似乎这四个基因的野生型等位基因使细胞能够确定其在发育中的花中的位置，从而进行适当的分化。我们提出这些基因可能参与在花原基内建立或响应同心的、重叠的区域。
We describe the effects of four recessive homeotic mutations that specifically disrupt the development of flowers in Arabidopsis thaliana. Each of the recessive mutations affects the outcome of organ development, but not the location of organ primordia. Homeotic transformations observed are as follows. In agamous-1, stamens to petals; in apetala2-1, sepals to leaves and petals to staminoid petals; in apetala3-1, petals to sepals and stamens to carpels; in pistillata-1, petals to sepals. In addition, two of these mutations (ap2-1 and pi-1) result in loss of organs, and ag-1 causes the cells that would ordinarily form the gynoecium to differentiate as a flower. Two of the mutations are temperature-sensitive. Temperature shift experiments indicate that the wild-type AP2 gene product acts at the time of primordium initiation; the AP3 product is active later. It seems that the wild-type alleles of these four genes allow cells to determine their place in the developing flower and thus to differentiate appropriately. We propose that these genes may be involved in setting up or responding to concentric, overlapping fields within the flower primordium.