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首页> 外文期刊>Development >Phyllotaxis involves auxin drainage through leaf primordia
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Phyllotaxis involves auxin drainage through leaf primordia

机译：音律涉及通过叶原基排出植物生长素

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The spatial arrangement of leaves and flowers around the stem, known as phyllotaxis, is controlled by an auxin-dependent reiterative mechanism that leads to regular spacing of the organs and thereby to remarkably precise phyllotactic patterns. The mechanism is based on the active cellular transport of the phytohormone auxin by cellular influx and efflux carriers, such as AUX1 and PIN1. Their important role in phyllotaxis is evident from mutant phenotypes, but their exact roles in space and time are difficult to address due to the strong pleiotropic phenotypes of most mutants in phyllotaxis. Models of phyllotaxis invoke the accumulation of auxin at leaf initials and removal of auxin through their developing vascular strand, the midvein. We have developed a precise microsurgical tool to ablate the midvein at high spatial and temporal resolution in order to test its function in leaf formation and phyllotaxis. Using amplified femtosecond laser pulses, we ablated the internal tissues in young leaf primordia of tomato (Solanum lycopersicum) without damaging the overlying L-1 and L-2 layers. Our results show that ablation of the future midvein leads to a transient accumulation of auxin in the primordia and to an increase in their width. Phyllotaxis was transiently affected after midvein ablations, but readjusted after two plastochrons. These results indicate that the developing midvein is involved in the basipetal transport of auxin through young primordia, which contributes to phyllotactic spacing and stability.
机译：茎周围的叶子和花朵的空间排列（称为叶序）受生长素依赖的重复机制控制，该机制导致器官的规则间隔，从而显着精确地确定了叶序模式。该机制基于细胞流入和流出载体（例如AUX1和PIN1）对植物激素生长素的主动细胞转运。从突变表型可以看出它们在叶序中的重要作用，但是由于大多数叶序中的强多效性表型，它们在空间和时间上的确切作用难以解决。叶序模型引起植物生长素在叶的初始聚集，并通过发育中的血管链中脉去除生长素。我们已经开发出一种精确的显微外科工具，以高时空分辨率消融中脉，以测试其在叶片形成和叶序发育中的功能。使用放大的飞秒激光脉冲，我们烧蚀了番茄幼叶原基的内部组织（Solanum lycopersicum），而没有损坏上面的L-1和L-2层。我们的结果表明，未来中脉的消融导致生长素在原基中的短暂蓄积并导致其宽度增加。中静脉消融后，音轴受到短暂影响，但在两次塑形后进行了重新调整。这些结果表明，发育中的中脉参与了生长素通过年轻原基的基生植物转运，这有助于叶序间距和稳定性。

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