Ethylene mediates dichromate-induced inhibition of primary root growth by altering AUX1 expression and auxin accumulation in Arabidopsis thaliana
Ethylene mediates dichromate-induced inhibition of primary root growth by altering AUX1 expression and auxin accumulation in Arabidopsis thaliana
复制标题
乙烯通过改变拟南芥中 AUX1 表达和生长素积累介导重铬酸盐诱导的初生根生长抑制
DOI：
10.1111/pce.13174
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Yinbo Gan
中科院分区：
文献类型：
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作者：
Wakeel Abdul;Ali Imran;Upreti Sakila;Azizullah Azizullah;Liu Bohan;Khan Ali Raza;Huang Linli;Wu Minjie;Yinbo Gan
六价铬[Cr（VI）]会导致全球农作物产量和质量的大幅下降。根是第一个与Cr（VI）毒性相互作用的植物器官，其抑制主根伸长，但这种抑制的潜在机制仍然难以捉摸。在这项研究中，我们调查的可能性，铬（VI）通过调节细胞周期相关的基因，乙烯信号有助于这一过程中减少主根的生长。我们表明，铬（VI）介导的抑制主根伸长缓解乙烯感知和生物合成拮抗剂银和钴，分别。此外，乙烯信号传导缺陷突变体（ein 2 - 1和etr 1 - 3）对Cr（VI）不敏感，而过量产生突变体（eto 1 - 1）对Cr（VI）超敏感。我们还报告说，高水平的铬（VI）显着诱导生长素在初级根尖的分布和积累，但这种增加显着抑制幼苗暴露于银或钴。此外，遗传和生理研究表明，AUXIN-RESISTANT 1（AUX 1）参与了Cr（VI）诱导的对主根生长的抑制。综上所述，我们的研究结果表明，乙烯介导铬（VI）诱导的抑制主根伸长通过增加生长素积累和极性运输刺激表达的AUX 1。
The hexavalent form of chromium [Cr(VI)] causes a major reduction in yield and quality of crops worldwide. The root is the first plant organ that interacts with Cr(VI) toxicity, which inhibits primary root elongation, but the underlying mechanisms of this inhibition remain elusive. In this study, we investigate the possibility that Cr(VI) reduces primary root growth ofArabidopsisby modulating the cell cycle‐related genes and that ethylene signalling contributes to this process. We show that Cr(VI)‐mediated inhibition of primary root elongation was alleviated by the ethylene perception and biosynthesis antagonists silver and cobalt, respectively. Furthermore, the ethylene signalling defective mutants (ein2‐1 and etr1‐3) were insensitive, whereas the overproducer mutant (eto1‐1) was hypersensitive to Cr(VI). We also report that high levels of Cr(VI) significantly induce the distribution and accumulation of auxin in the primary root tips, but this increase was significantly suppressed in seedlings exposed to silver or cobalt. In addition, genetic and physiological investigations show thatAUXIN‐RESISTANT1(AUX1) participates in Cr(VI)‐induced inhibition of primary root growth. Taken together, our results indicate that ethylene mediates Cr(VI)‐induced inhibition of primary root elongation by increasing auxin accumulation and polar transport by stimulating the expression ofAUX1.