Auxin is a major phytohormone that controls numerous aspects of plant development and coordinates plant responses to the environment. Morphogenic gradients of auxin govern cell fate decisions and underlie plant phenotypic plasticity. Polar auxin transport plays a central role in auxin maxima generation. The discovery of the exquisite spatiotemporal expression patterns of auxin biosynthesis genes of the WEI8/TAR and YUC families suggested that local auxin production may contribute to the formation of auxin maxima. Herein, we systematically addressed the role of local auxin biosynthesis in plant development and responses to the stress phytohormone ethylene by manipulating spatiotemporal patterns of WEI8. Our study revealed that local auxin biosynthesis and transport act synergistically and are individually dispensable for root meristem maintenance. In contrast, flower fertility and root responses to ethylene require local auxin production that cannot be fully compensated for by transport in the generation of morphogenic auxin maxima.

生长素是一种主要的植物激素，可控制植物发育的各个方面并协调植物对环境的反应。生长素的形态发生梯度决定着细胞的命运决定和植物表型可塑性的基础。极地植物生长素的运输在最大植物生长素的产生中起着核心作用。的生长素生物合成基因的精美时空表达模式的发现WEI8 / TAR和YUC家庭建议本地生长素的生产可以有助于生长素最大值的形成。在本文中，我们通过操纵WEI8的时空模式，系统地解决了局部生长素生物合成在植物发育中的作用以及对胁迫植物激素乙烯的响应。。我们的研究表明，局部植物生长素的生物合成和运输具有协同作用，并且对于维持分生组织具有独特的作用。相反，花的育性和对乙烯的根反应需要局部生长素的产生，而在形成最大生长素的生长素中不能通过运输来完全补偿。