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

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...

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Bibliographic Details
Published in:The Plant cell 2018-07, Vol.30 (7), p.1461-1475
Main Authors: Zhang, Ning, Yu, Hong, Yu, Hao, Cai, Yueyue, Huang, Linzhou, Xu, Cao, Xiong, Guosheng, Meng, Xiangbing, Wang, Jiyao, Chen, Haofeng, Liu, Guifu, Jing, Yanhui, Yuan, Yundong, Liang, Yan, Li, Shujia, Smith, Steven M., Li, Jiayang, Wang, Yonghong
Format: Article
Language:English
Subjects:
Architecture
Cereals
Crop yield
Gene expression
Genes
Grain
Gravitropism
Heat stress
Heat tolerance
Optimization
Oryza sativa
Ribonucleic acid
Rice
RNA
Shoots
Skewed distributions
Transcription factors
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Summary: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.
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.18.00063