The epigenetic regulator ULTRAPETALA1 suppresses de novo root regeneration from Arabidopsis leaf explants.

The epigenetic regulator ULTRAPETALA1 suppresses de novo root regeneration from Arabidopsis leaf explants.
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表观遗传调节因子 ULTRAPETALA1 抑制拟南芥叶外植体的从头再生

DOI:
10.1080/15592324.2022.2031784
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发表时间:
2022-12-31
影响因子:
2.9
通讯作者:
Müller-Xing R
Müller-Xing R
中科院分区:
生物学4区
文献类型:
--
作者:
Tian J;Xing Q;Jing T;Fan X;Zhang Q;Müller-Xing R

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摘要植物地上器官离体后具有再生不定根的能力。在拟南芥(Arabidopsis thaliana)中,来自叶外植体的从头根再生(de novo root regeneration,DNRR)由创伤信号触发,创伤信号快速诱导乙烯应答因子(ERF)转录因子ERF 109和ABR1(ERF 111)的表达。反过来,ERF促进ASA1的表达,ASA1是生长素生物合成的必需酶,其通过在叶片的受伤侧附近提供高水平的生长素而有助于生根。在这里,我们表明,表观遗传调节ULTRAPETALA 1(ULT1),它与Polycomb和Trithorax组蛋白相互作用的损失,加速和加强不定根的形成。ult1突变体中ERF109和ASA1的表达增加,而ABR1没有显著变化。在含有外源生长素的培养基上培养外植体,将野生型中的不定根形成等同于ULT1突变体,这表明ULT1通过抑制生长素的生物合成来负调节DNRR。基于这些发现,我们提出ULT1参与了一种新的机制,防止DNRR过程中不定根的过度增殖。
ABSTRACT Plants have the potency to regenerate adventitious roots from aerial organs after detachment. In Arabidopsis thaliana, de novo root regeneration (DNRR) from leaf explants is triggered by wounding signaling that rapidly induces the expression of the ETHYLENE RESPONSE FACTOR (ERF) transcription factors ERF109 and ABR1 (ERF111). In turn, the ERFs promote the expression of ASA1, an essential enzyme of auxin biosynthesis, which contributes to rooting by providing high levels of auxin near the wounding side of the leaf. Here, we show that the loss of the epigenetic regulator ULTRAPETALA1 (ULT1), which interacts with Polycomb and Trithorax Group proteins, accelerates and reinforces adventitious root formation. Expression of ERF109 and ASA1 was increased in ult1 mutants, whereas ABR1 was not significantly changed. Cultivation of explants on media with exogenous auxin equates adventitious root formation in wild-type with ult1 mutants, suggesting that ULT1 negatively regulates DNRR by suppressing auxin biosynthesis. Based on these findings, we propose that ULT1 is involved in a novel mechanism that prevents overproliferation of adventitious roots during DNRR.
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