scholarly journals Extracellular ATP Inhibits Root Gravitropism at Concentrations That Inhibit Polar Auxin Transport

2003 ◽  
Vol 131 (1) ◽  
pp. 147-154 ◽  
Author(s):  
Wenqiang Tang ◽  
Shari R. Brady ◽  
Yu Sun ◽  
Gloria K. Muday ◽  
Stanley J. Roux
Keyword(s):  
Auxin Transport ◽  
Extracellular Atp ◽  
Polar Auxin Transport ◽  
Root Gravitropism

scholarly journals LAZY3 plays a pivotal role in positive root gravitropism in Lotus japonicus

2019 ◽  
Vol 71 (1) ◽  
pp. 168-177 ◽  
Author(s):  
Yaping Chen ◽  
Shaoming Xu ◽  
Lu Tian ◽  
Leru Liu ◽  
Mingchao Huang ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Auxin Transport ◽  
Positive Root ◽  
Lotus Japonicus ◽  
Polar Auxin Transport ◽  
Pivotal Role ◽  
Root Gravitropism ◽  
Root Stele

LAZY3, polarly localized to the plasma membrane in root stele cells, is involved in rootward polar auxin transport in roots and required for positive root gravitropism in Lotus japonicus.

scholarly journals The role of Arabidopsis Actin-Related Protein 3 in amyloplast sedimentation and polar auxin transport in root gravitropism

2016 ◽  
Vol 67 (18) ◽  
pp. 5325-5337 ◽  
Author(s):  
Jun-Jie Zou ◽  
Zhong-Yu Zheng ◽  
Shan Xue ◽  
Han-Hai Li ◽  
Yu-Ren Wang ◽  
...  
Keyword(s):  
Auxin Transport ◽  
Polar Auxin Transport ◽  
Related Protein ◽  
Root Gravitropism

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 Dim-Red-Light-Induced Increase in Polar Auxin Transport in Cucumber Seedlings

1998 ◽  
Vol 116 (4) ◽  
pp. 1505-1513 ◽  
Author(s):  
James R. Shinkle ◽  
Rajan Kadakia ◽  
Alan M. Jones
Keyword(s):  
Auxin Transport ◽  
Red Light ◽  
Polar Auxin Transport ◽  
Cucumber Seedlings
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