RABBIT EARS is a second-whorl repressor of AGAMOUS that maintains spatial boundaries in Arabidopsis flowers
RABBIT EARS is a second-whorl repressor of AGAMOUS that maintains spatial boundaries in Arabidopsis flowers
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DOI：
10.1111/j.1365-313x.2005.02633.x
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发表时间：
2006-02-01
期刊：
影响因子：
7.2
通讯作者：
Fletcher, JC
中科院分区：
文献类型：
--
作者：
Krizek, BA;Lewis, MW;Fletcher, JC
兔耳(RBE)基因已被鉴定为拟南芥花瓣发育的调控基因。我们发现，rbe突变体的第二轮花瓣可以被雄蕊器官、雄蕊或花丝所取代，并且一些rbe花的花被片数目增加，并表现出合生的被片。我们证明这些RBE缺陷是由于AGAMOUS(AG)在第二轮中的错误表达。与其维持AG表达的空间边界的作用一致，rBE增强了ap2-1、lug-1和clf-2突变体中存在的第二轮缺陷。在第二轮器官的发育过程中，RBE在不寻常花器官(UFO)的下游起着相同的作用。在ap2-2 rbe-3、ant-4 rbe-3和CuC2-1 rbe-3双突变体中，增强的第一轮器官融合支持RBE在器官分离中的额外作用。因此，Rbe在幼花中维持两种不同类型的空间边界：轮生内器官原基之间的边界和轮生之间同源异型基因表达的边界。
The RABBIT EARS ( RBE) gene has been identified as a regulator of petal development in Arabidopsis thaliana. We find that second-whorl petals in rbe mutants can be replaced with staminoid organs, stamens or filaments and that some rbe flowers have increased numbers of sepals and exhibit fusion of sepals. We show that these rbe defects are due to AGAMOUS ( AG) misexpression in the second whorl. Consistent with its role in maintaining the spatial boundary of AG expression, rbe enhanced the second-whorl defects present in ap2-1, lug-1 and clf-2 mutants. In the development of second-whorl organs, RBE acts in the same pathway and downstream of UNUSUAL FLORAL ORGANS ( UFO). Enhanced first-whorl organ fusion in ap2-2 rbe-3, ant-4 rbe-3 and cuc2-1 rbe-3 double mutants supports an additional role for RBE in organ separation. RBE thus acts to maintain two different types of spatial boundaries in young flowers: boundaries between organ primordia within a whorl and boundaries of homeotic gene expression between whorls.