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Roy R, Bassham DC. Gravitropism and Lateral Root Emergence are Dependent on the Trans-Golgi Network Protein TNO1. Front Plant Sci. 2015;6:969doi: 10.3389/fpls.2015.00969.
Roy, R., & Bassham, D. C. (2015). Gravitropism and Lateral Root Emergence are Dependent on the Trans-Golgi Network Protein TNO1. Frontiers in plant science, 6969. https://doi.org/10.3389/fpls.2015.00969
Roy, Rahul, and Bassham, Diane C. "Gravitropism and Lateral Root Emergence are Dependent on the Trans-Golgi Network Protein TNO1." Frontiers in plant science vol. 6 (2015): 969. doi: https://doi.org/10.3389/fpls.2015.00969
Roy R, Bassham DC. Gravitropism and Lateral Root Emergence are Dependent on the Trans-Golgi Network Protein TNO1. Front Plant Sci. 2015 Nov 12;6:969. doi: 10.3389/fpls.2015.00969. eCollection 2015. PMID: 26617617; PMCID: PMC4642138.
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Front Plant Sci. 2015 Nov 12;6:969. doi: 10.3389/fpls.2015.00969. eCollection 2015.

Gravitropism and Lateral Root Emergence are Dependent on the Trans-Golgi Network Protein TNO1.

Frontiers in plant science

Rahul Roy, Diane C Bassham

Affiliations

  1. Department of Genetics, Development and Cell Biology, Iowa State University, Ames IA, USA ; Interdepartmental Genetics Program, Iowa State University, Ames IA, USA.
  2. Department of Genetics, Development and Cell Biology, Iowa State University, Ames IA, USA ; Interdepartmental Genetics Program, Iowa State University, Ames IA, USA ; Plant Sciences Institute, Iowa State University, Ames IA, USA.

PMID: 26617617 PMCID: PMC4642138 DOI: 10.3389/fpls.2015.00969

Abstract

The trans-Golgi network (TGN) is a dynamic organelle that functions as a relay station for receiving endocytosed cargo, directing secretory cargo, and trafficking to the vacuole. TGN-localized SYP41-interacting protein (TNO1) is a large, TGN-localized, coiled-coil protein that associates with the membrane fusion protein SYP41, a target SNARE, and is required for efficient protein trafficking to the vacuole. Here, we show that a tno1 mutant has auxin transport-related defects. Mutant roots have delayed lateral root emergence, decreased gravitropic bending of plant organs and increased sensitivity to the auxin analog 2,4-dichlorophenoxyacetic acid and the natural auxin 3-indoleacetic acid. Auxin asymmetry at the tips of elongating stage II lateral roots was reduced in the tno1 mutant, suggesting a role for TNO1 in cellular auxin transport during lateral root emergence. During gravistimulation, tno1 roots exhibited delayed auxin transport from the columella to the basal epidermal cells. Endocytosis to the TGN was unaffected in the mutant, indicating that bulk endocytic defects are not responsible for the observed phenotypes. Together these studies demonstrate a role for TNO1 in mediating auxin responses during root development and gravistimulation, potentially through trafficking of auxin transport proteins.

Keywords: auxin; gravitropism; lateral root; tethering factor; trans-Golgi network

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