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Development:组织特异性生长素转运介导叶脉的模式建成

已有 1247 次阅读 2020-6-6 09:25 |个人分类:每日摘要|系统分类:论文交流

Vein patterning by tissue-specific auxin transport

第一作者Priyanka Govindaraju

第一单位加拿大阿尔伯塔大学

通讯作者Enrico Scarpella


 Abstract 


背景回顾Unlike in animals, in plants vein patterning does not rely on direct cell-cell interaction and cell migration; instead, it depends on the transport of the plant hormone auxin, which in turn depends on the activity of the PIN-FORMED1 (PIN1) auxin transporter.


现有假设:The current hypotheses of vein patterning by auxin transport propose that in the epidermis of the developing leaf PIN1-mediated auxin transport converges to peaks of auxin level. From those convergence points of epidermal PIN1 polarity, auxin would be transported in the inner tissues where it would give rise to major veins.


测试结果:Here we tested predictions of this hypothesis and found them unsupported: epidermal PIN1 expression is neither required nor sufficient for auxin-transport-dependent vein patterning, whereas inner-tissue PIN1 expression turns out to be both required and sufficient for auxin-transport-dependent vein patterning.


结论:Our results refute all vein patterning hypotheses based on auxin transport from the epidermis and suggest alternatives for future tests.


 摘  要 


与动物不同,植物中叶脉模式建成并不依赖于细胞与细胞之间直接的互作以及细胞迁移;相反,它依赖于植物激素生长素的转运,而生长素的转运又依赖于PIN1生长素转运蛋白。目前有关于生长素转运介导的叶脉模式建成机制是,在正在发育的叶片表皮,PIN1介导的生长素转运会收敛于一个生长素含量的峰值。在表皮中,由PIN1极性所导致的生长素浓度收敛点,生长素可以从这里被转运到组织内部,从而形成主要的叶脉。本文中,作者基于该假设测试了几个预期,但是发现了相反了结论:表皮中PIN1的表达对于依赖于生长素转运的叶脉模式建成即不必要、也不充分。相反,内部组织的PIN1表达对于依赖于生长素转运的叶脉模式建成是充分必要条件。本文的研究显示,之前有关植物中叶脉模式建成依赖于来自表皮的生长素转运这一假设是错误的,作者进一步提出了备择假设,以期未来能够进行验证。



doi: 10.1242/dev.187666


Journal: Development

Published date: June 03, 2020



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