PIN1-Independent Leaf Initiation in Arabidopsis
PIN1-Independent Leaf Initiation in Arabidopsis
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DOI：
10.1104/pp.112.200402
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发表时间：
2012-08-01
期刊：
影响因子：
7.4
通讯作者：
Kuhlemeier, Cris
中科院分区：
文献类型：
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作者：
Guenot, Bernadette;Bayer, Emmanuelle;Kuhlemeier, Cris
叶序性，即叶和花围绕茎的规则排列，是植物结构的一个重要特征。目前的模型提出，器官启动的时空调节是由植物激素生长素和其外排载体PIN-FORMED 1（PIN 1）之间的正反馈回路控制的。因此，pin 1突变体产生裸露的花序柄，很少或没有花，表明PIN 1在器官起始中起着至关重要的作用。然而，pin 1突变体确实产生叶子。为了了解拟南芥（Arabidopsis thaliana）的调控机制控制叶启动，我们已经详细描述了营养pin 1表型。我们发现，虽然在营养pin 1突变体的叶片起始的时间是可变的，发散角明显偏离典型的137度值，叶片在早期发育阶段的位置是随机的。我们的数据进一步表明，其他PIN蛋白不太可能解释的持久性叶片启动和定位在pin 1营养发展。因此，叶序似乎比目前的机械模型所建议的更复杂。
Phyllotaxis, the regular arrangement of leaves and flowers around the stem, is a key feature of plant architecture. Current models propose that the spatiotemporal regulation of organ initiation is controlled by a positive feedback loop between the plant hormone auxin and its efflux carrier PIN-FORMED1 (PIN1). Consequently, pin1 mutants give rise to naked inflorescence stalks with few or no flowers, indicating that PIN1 plays a crucial role in organ initiation. However, pin1 mutants do produce leaves. In order to understand the regulatory mechanisms controlling leaf initiation in Arabidopsis (Arabidopsis thaliana) rosettes, we have characterized the vegetative pin1 phenotype in detail. We show that although the timing of leaf initiation in vegetative pin1 mutants is variable and divergence angles clearly deviate from the canonical 137 degrees value, leaves are not positioned at random during early developmental stages. Our data further indicate that other PIN proteins are unlikely to explain the persistence of leaf initiation and positioning during pin1 vegetative development. Thus, phyllotaxis appears to be more complex than suggested by current mechanistic models.