scholarly journals HOMEOBOX PROTEIN52 Mediates the Crosstalk between Ethylene and Auxin Signaling during Primary Root Elongation by Modulating Auxin Transport-Related Gene Expression

2018 ◽  
Vol 30 (11) ◽  
pp. 2761-2778 ◽  
Author(s):  
Zi-Qing Miao ◽  
Ping-Xia Zhao ◽  
Jie-Li Mao ◽  
Lin-Hui Yu ◽  
Yang Yuan ◽  
...  
Keyword(s):  
Gene Expression ◽  
Root Elongation ◽  
Auxin Transport ◽  
Primary Root ◽  
Auxin Signaling ◽  
Related Gene

scholarly journals Arabidopsis HB52 mediates the crosstalk between ethylene and auxin signaling pathways by regulating PIN2, WAG1, and WAG2 during primary root elongation

2018 ◽  
Author(s):  
Zi-Qing Miao ◽  
Ping-Xia Zhao ◽  
Jie-Li Mao ◽  
Lin-Hui Yu ◽  
Yang Yuan ◽  
...  
Keyword(s):  
Root Growth ◽  
Signaling Pathways ◽  
Molecular Mechanism ◽  
Root Elongation ◽  
Auxin Transport ◽  
Primary Root ◽  
Auxin Signaling ◽  
Elongation Zone ◽  
Ethylene Signaling ◽  
Physiological Processes

AbstractThe gaseous hormone ethylene participates in many physiological processes of plants. It is well known that ethylene-inhibited root elongation involves basipetal auxin delivery requiring PIN2. However, the molecular mechanism how ethylene regulates PIN2 is not well understood. Here, we report that the ethylene-responsive HD-Zip gene HB52 is involved in ethylene-mediated inhibition of primary root elongation. Using biochemical and genetic analyses, we demonstrated that HB52 is ethylene-responsive and acts immediately downstream of EIN3. HB52 knock-down mutants are insensitive to ethylene in primary root elongation while the overexpression lines have dramatically shortened roots like ethylene treated plants. Moreover, HB52 upregulates PIN2, WAG1, and WAG2 by directly binding to their promoter, leading to an enhanced basipetal auxin delivery to the elongation zone and thus inhibiting root growth. Our work uncovers HB52 as an important crosstalk node between ethylene signaling and auxin transport in root elongation.

scholarly journals Membrane Sterol Composition in Arabidopsis thaliana Affects Root Elongation via Auxin Biosynthesis

2021 ◽  
Vol 22 (1) ◽  
pp. 437
Author(s):  
Meng Wang ◽  
Panpan Li ◽  
Yao Ma ◽  
Xiang Nie ◽  
Markus Grebe ◽  
...  
Keyword(s):  
Root Elongation ◽  
Auxin Transport ◽  
Sterol Composition ◽  
Polar Auxin Transport ◽  
Sterol Biosynthesis ◽  
Auxin Biosynthesis ◽  
Root Tip ◽  
Auxin Signaling ◽  
Auxin Response ◽  
Short Root

Plant membrane sterol composition has been reported to affect growth and gravitropism via polar auxin transport and auxin signaling. However, as to whether sterols influence auxin biosynthesis has received little attention. Here, by using the sterol biosynthesis mutant cyclopropylsterol isomerase1-1 (cpi1-1) and sterol application, we reveal that cycloeucalenol, a CPI1 substrate, and sitosterol, an end-product of sterol biosynthesis, antagonistically affect auxin biosynthesis. The short root phenotype of cpi1-1 was associated with a markedly enhanced auxin response in the root tip. Both were neither suppressed by mutations in polar auxin transport (PAT) proteins nor by treatment with a PAT inhibitor and responded to an auxin signaling inhibitor. However, expression of several auxin biosynthesis genes TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS1 (TAA1) was upregulated in cpi1-1. Functionally, TAA1 mutation reduced the auxin response in cpi1-1 and partially rescued its short root phenotype. In support of this genetic evidence, application of cycloeucalenol upregulated expression of the auxin responsive reporter DR5:GUS (β-glucuronidase) and of several auxin biosynthesis genes, while sitosterol repressed their expression. Hence, our combined genetic, pharmacological, and sterol application studies reveal a hitherto unexplored sterol-dependent modulation of auxin biosynthesis during Arabidopsis root elongation.

scholarly journals Differential Behavior within a Grapevine Cluster: Decreased Ethylene-Related Gene Expression Dependent on Auxin Transport Is Correlated with Low Abscission of First Developed Berries

PLoS ONE ◽  
2014 ◽  
Vol 9 (11) ◽  
pp. e111258 ◽  
Author(s):  
Nathalie Kühn ◽  
Carlos Abello ◽  
Francisca Godoy ◽  
Serge Delrot ◽  
Patricio Arce-Johnson
Keyword(s):  
Gene Expression ◽  
Auxin Transport ◽  
Related Gene ◽  
Differential Behavior

MAPKs regulate root growth by influencing auxin signaling and cell cycle-related gene expression in cadmium-stressed rice

2013 ◽  
Vol 20 (8) ◽  
pp. 5449-5460 ◽  
Author(s):  
Feng Yun Zhao ◽  
Fan Hu ◽  
Shi Yong Zhang ◽  
Kai Wang ◽  
Cheng Ren Zhang ◽  
...  
Keyword(s):  
Gene Expression ◽  
Cell Cycle ◽  
Root Growth ◽  
Auxin Signaling ◽  
Related Gene ◽  
Cell Cycle Related Gene

scholarly journals 5-Aminolevulinic acid (ALA) promotes primary root elongation through modulation of auxin transport in Arabidopsis

2019 ◽  
Vol 41 (6) ◽  
Author(s):  
Yuyan An ◽  
Danxuan Cheng ◽  
Zhixiong Rao ◽  
Yongping Sun ◽  
Quan Tang ◽  
...  
Keyword(s):  
Root Elongation ◽  
Auxin Transport ◽  
Aminolevulinic Acid ◽  
Primary Root
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