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LARGE ROOT ANGLE1, encoding OsPIN2, is involved in root system architecture in rice

Wang, Lingling; Guo, Mengxue; Li, Yong; Ruan, Wenyuan; Mo, Xiaorong; Wu, Zhongchang; Sturrock, Craig; Yu, Hao; Lu, Chungui; Peng, Jinrong; Mao, Chuanzao

LARGE ROOT ANGLE1, encoding OsPIN2, is involved in root system architecture in rice Thumbnail


Authors

Lingling Wang

Mengxue Guo

Yong Li

Wenyuan Ruan

Xiaorong Mo

Zhongchang Wu

Hao Yu

Chungui Lu

Jinrong Peng

Chuanzao Mao



Abstract

Root system architecture is very important for plant growth and crop yield. It is essential for nutrient and water uptake, anchoring, and mechanical support. Root growth angle (RGA) is a vital constituent of root system architecture and is used as a parameter for variety evaluation in plant breeding. However, little is known about the underlying molecular mechanisms that determine root growth angle in rice (Oryza sativa). In this study, a rice mutant large root angle1 (lra1) was isolated and shown to exhibit a large RGA and reduced sensitivity to gravity. Genome resequencing and complementation assays identified OsPIN2 as the gene responsible for the mutant phenotypes. OsPIN2 was mainly expressed in roots and the base of shoots, and showed polar localization in the plasma membrane of root epidermal and cortex cells. OsPIN2 was shown to play an important role in mediating root gravitropic responses in rice and was essential for plants to produce normal RGAs. Taken together, our findings suggest that OsPIN2 plays an important role in root gravitropic responses and determining the root system architecture in rice by affecting polar auxin transport in the root tip.

Citation

Wang, L., Guo, M., Li, Y., Ruan, W., Mo, X., Wu, Z., …Mao, C. (in press). LARGE ROOT ANGLE1, encoding OsPIN2, is involved in root system architecture in rice. Journal of Experimental Botany, https://doi.org/10.1093/jxb/erx427

Journal Article Type Article
Acceptance Date Nov 13, 2017
Online Publication Date Dec 22, 2017
Deposit Date Jan 18, 2018
Publicly Available Date Jan 18, 2018
Journal Journal of Experimental Botany
Print ISSN 0022-0957
Electronic ISSN 1460-2431
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1093/jxb/erx427
Keywords Auxin, gravitropism, OsPIN2, rice, root growth angle, root system architecture
Public URL https://nottingham-repository.worktribe.com/output/901393
Publisher URL https://academic.oup.com/jxb/advance-article/doi/10.1093/jxb/erx427/4773865
Contract Date Jan 18, 2018

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