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A Core Regulatory Pathway Controlling Rice Tiller Angle Mediated by the LAZY1-Dependent Asymmetric Distribution of Auxin


Zang, N and Yu, H and Yu, H and Cai, Y and Huang, L and Xu, C and Xiong, G and Meng, X and Wang, J and Chen, H and Liu, G and Jing, Y and Yuan, Y and Liang, Y and Li, S and Smith, SM and Li, J and Wang, Y, A Core Regulatory Pathway Controlling Rice Tiller Angle Mediated by the LAZY1-Dependent Asymmetric Distribution of Auxin, The Plant Cell, 30, (7) pp. 1461-1475. ISSN 1532-298X (2018) [Refereed Article]

DOI: doi:10.1105/tpc.18.00063


Tiller angle in cereals is a key shoot architecture trait that strongly influences grain yield. Studies in rice (Oryza sativa) have implicated shoot gravitropism in the regulation of tiller angle. However, the functional link between shoot gravitropism and tiller angle is unknown. Here, we conducted a large-scale transcriptome analysis of rice shoots in response to gravistimulation and identified two new nodes of a shoot gravitropism regulatory gene network that also controls rice tiller angle. We demonstrate that HEAT STRESS TRANSCRIPTION FACTOR 2D (HSFA2D) is an upstream positive regulator of the LAZY1-mediated asymmetric auxin distribution pathway. We also show that two functionally redundant transcription factor genes, WUSCHEL RELATED HOMEOBOX6 (WOX6) and WOX11, are expressed asymmetrically in response to auxin to connect gravitropism responses with the control of rice tiller angle. These findings define upstream and downstream genetic components that link shoot gravitropism, asymmetric auxin distribution, and rice tiller angle. The results highlight the power of the high-temporal-resolution RNA-seq data set and its use to explore further genetic components controlling tiller angle. Collectively, these approaches will identify genes to improve grain yields by facilitating the optimization of plant architecture.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant cell and molecular biology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Rice
UTAS Author:Smith, SM (Professor Steven Smith)
ID Code:151161
Year Published:2018
Web of Science® Times Cited:71
Deposited By:Plant Science
Deposited On:2022-07-22
Last Modified:2022-07-23

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