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>SLOW MOTION Is Required for Within-Plant Auxin Homeostasis and Normal Timing of Lateral Organ Initiation at the Shoot Meristem in Arabidopsis
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SLOW MOTION Is Required for Within-Plant Auxin Homeostasis and Normal Timing of Lateral Organ Initiation at the Shoot Meristem in Arabidopsis
n nnnThe regular arrangement of leaves and flowers around a plant'sstem is a fascinating expression of biological pattern formation.Based on current models, the spacing of lateral shoot organsis determined by transient local auxin maxima generated by polarauxin transport, with existing primordia draining auxin fromtheir vicinity to restrict organ formation close by. It is unclearwhether this mechanism encodes not only spatial informationbut also temporal information about the plastochron (i.e., theinterval between the formation of successive primordia). Here,we identify the Arabidopsis thaliana F-box protein SLOW MOTION(SLOMO) as being required for a normal plastochron. SLOMO interactsgenetically with components of polar auxin transport, and mutantshoot apices contain less free auxin. However, this reducedauxin level at the shoot apex is not due to increased polarauxin transport down the stem, suggesting that it results fromreduced synthesis. Independently reducing the free auxin levelin plants causes a similar lengthening of the plastochron asseen in slomo mutants, suggesting that the reduced auxin levelin slomo mutant shoot apices delays the establishment of thenext auxin maximum. SLOMO acts independently of other plastochronregulators, such as ALTERED MERISTEM PROGRAM1 or KLUH/CYP78A5.We propose that SLOMO contributes to auxin homeostasis in theshoot meristem, thus ensuring a normal rate of the formationof auxin maxima and organ initiation.展开▼
机译:ABSTRACTn FONT> TH> TR> TABLE> n
n TOP n <字体颜色= 464c53>抽象 FONT> n 介绍 n 结果 n 讨论 n 方法 n 参考文献 n FONT> TH> TR> TABLE> n nnn植物 SUP>茎周围的叶子和花朵的规则排列 SUP>在当前模型的基础上,侧向器官的间隔 SUP>由Polar SUP产生的瞬时局部生长素最大值确定>生长素运输,现有原基从 SUP>附近排出生长素以限制附近的器官形成。目前尚不清楚 SUP>该机制是否不仅编码空间信息 SUP>,而且还编码有关塑性同步的时间信息(即,连续原基形成之间的 SUP>间隔)。在这里, SUP>我们确定了拟南芥 I> F盒蛋白SLOW MOTION SUP>(SLOMO)是正常塑体运动所必需的。 SLOMO I>与极性植物生长素运输的成分发生遗传相互作用,而突变体 SUP>拍摄的顶点含有较少的游离植物生长素。但是,这种降低的 SUP>生长素水平在茎尖不是由于极性 SUP>植物生长素向茎杆下运输的增加,表明这是由于 SUP>还原的合成导致的。 。独立地降低植物中的游离植物生长素水平 SUP>会导致与 slomo I>突变体中所见的 SUP>相似的质子同步延长,表明植物生长素水平降低了 slomo I>突变芽尖中的> SUP>会延迟 SUP>下一个生长素最大值的建立。 SLOMO I>的行为独立于其他plastochron SUP>调节器,例如 ALTETED MERISTEM PROGRAM1 I>或 KLUH / CYP78A5 I>。 < / SUP>我们建议 SLOMO I>有助于 SUP>分支分生组织中的生长素稳态,从而确保最大生长素和器官的正常形成 SUP>启动。 SUP>
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