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首页> 外文期刊>Journal of pesticide science >Expression profiles of four BES1/BZR1 homologous genes encoding bHLH transcription factors in Arabidopsis
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Expression profiles of four BES1/BZR1 homologous genes encoding bHLH transcription factors in Arabidopsis

机译：拟南芥BHLH转录因子的四个BES1 / BZR1同源基因的表达谱

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摘要

Arabidopsis bHLH-type transcription factors-BRASSINOSTEROID INSENSITIVE 1-EMS-SUPPRESSOR 1 (BES1) and BRASSINAZOLE RESISTANT 1 (BZR1)-play key roles in brassinosteroid (BR) signaling. By contrast, the functions of the other four BES1/BZR1 homologs (BEH1-4) remain unknown. Here, we describe the detailed expression profiles of the BES1/BZR1 family genes. Their expressions were distinct regarding growth-stage dependence and organ specificity but exhibited some overlaps as well. Furthermore, their mRNA levels mostly remained unchanged responding to seven non-BR phytohormones. However, BEH1 and BEH2 were downregulated by brassinolide, suggesting a close association with the BR function. Additionally, BEH4 was ubiquitously expressed throughout the life of the plant but displayed some expression preference. For instance, BEH4 expression was limited to guard cells and the adjacent pavement cells in the leaf epidermis and was induced during growth progression in very young seedlings, suggesting that BEH4 is specifically regulated in certain contexts, although it is almost constitutively controlled.
机译：拟南芥bHLH型转录因子油菜素类固醇不敏感1-EMS抑制子1（BES1）和油菜素唑抗性1（BZR1）在油菜素类固醇（BR）信号传导中起关键作用。相比之下，其他四个BES1/BZR1同系物（BEH1-4）的功能仍然未知。在这里，我们描述了BES1/BZR1家族基因的详细表达谱。它们的表达在生长阶段依赖性和器官特异性方面是不同的，但也表现出一些重叠。此外，它们的mRNA水平在七种非BR植物激素的作用下基本保持不变。然而，油菜素内酯下调了BEH1和BEH2，表明其与BR功能密切相关。此外，BEH4在植物的整个生命周期中普遍表达，但表现出一定的表达偏好。例如，BEH4的表达仅限于叶表皮中的保卫细胞和相邻的铺路细胞，并且在非常幼嫩的幼苗的生长过程中被诱导，这表明BEH4在某些情况下受到特别调节，尽管它几乎是组成性控制的。

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