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首页> 美国卫生研究院文献>Frontiers in Plant Science >Gladiolus hybridus ABSCISIC ACID INSENSITIVE 5 (GhABI5) is an important transcription factor in ABA signaling that can enhance Gladiolus corm dormancy and Arabidopsis seed dormancy
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Gladiolus hybridus ABSCISIC ACID INSENSITIVE 5 (GhABI5) is an important transcription factor in ABA signaling that can enhance Gladiolus corm dormancy and Arabidopsis seed dormancy

机译：唐diol蒲ABSCISIC ACID INSENSITIVE 5（GhABI5）是ABA信号传导中的重要转录因子可增强唐diol蒲的球茎休眠和拟南芥种子的休眠

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The phytohormone abscisic acid (ABA) regulates plant development and is crucial for abiotic stress response. In this study, cold storage contributes to reducing endogenous ABA content, resulting in dormancy breaking of Gladiolus. The ABA inhibitor fluridone also promotes germination, suggesting that ABA is an important hormone that regulates corm dormancy. Here, we report the identification and functional characterization of the Gladiolus ABI5 homolog (GhABI5), which is a basic leucine zipper motif transcriptional factor (TF). GhABI5 is expressed in dormant vegetative organs (corm, cormel, and stolon) as well as in reproductive organs (stamen), and it is up-regulated by ABA or drought. Complementation analysis reveals that GhABI5 rescues the ABA insensitivity of abi5-3 during seed germination and induces the expression of downstream ABA response genes in Arabidopsis thaliana (EM1, EM6, and RD29B). Down-regulation of GhABI5 in dormant cormels via virus induced gene silence promotes sprouting and reduces the expression of downstream genes (GhLEA and GhRD29B). The results of this study reveal that GhABI5 regulates bud dormancy (vegetative organ) in Gladiolus in addition to its well-studied function in Arabidopsis seeds (reproductive organ).
机译：植物激素脱落酸（ABA）调节植物发育，对于非生物胁迫响应至关重要。在这项研究中，冷藏有助于降低内源性ABA含量，从而导致唐Gla蒲的休眠破裂。 ABA抑制剂氟啶酮也促进发芽，表明ABA是调节球茎休眠的重要激素。在这里，我们报告唐the蒲ABI5同源物（GhABI5），这是一个基本的亮氨酸拉链基序转录因子（TF）的鉴定和功能表征。 GhABI5在休眠的营养器官（球茎，果肉和茎）以及生殖器官（雄蕊）中表达，并且受ABA或干旱上调。互补分析显示，GhABI5拯救了种子发芽过程中abi5-3的ABA不敏感性，并诱导了拟南芥中下游ABA响应基因的表达（EM1，EM6和RD29B）。通过病毒诱导的基因沉默，在休眠cormels中下调GhABI5促进发芽并降低下游基因（GhLEA和GhRD29B）的表达。这项研究的结果表明，除了在拟南芥属种子（生殖器官）中已充分研究的功能外，GhABI5还调节唐Gla蒲的芽休眠（营养器官）。

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