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Plant function and evolutionary biology
REVIEW

Advances in the role of auxin for transcriptional regulation of lignin biosynthesis

Gaoyi Qu A , Dan Peng A B D , Ziqin Yu A , Xinling Chen A , Xinrui Cheng A , Youzhen Yang A , Tao Ye A , Qiang Lv A , Wenjun Ji A , Xiangwen Deng C and Bo Zhou https://orcid.org/0000-0002-7876-6888 A B C D E F
+ Author Affiliations
- Author Affiliations

A Faculty of Life Science and Biotechnology of Central South University of Forestry and Technology; 410004, Changsha, China.

B Huitong National Field Station for Scientific Observation and Research of Chinese Fir Plantation Ecosystem in Hunan Province, Huitong 438107, China.

C National Engineering Laboratory of Applied Technology for Forestry and Ecology in Southern China, Changsha 410004, Hunan, China.

D Forestry Biotechnology Hunan Key Laboratories, Hunan Changsha, 410004, China.

E Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, Ministry of Education, Central South University of Forestry and Technology, 410018, Changsha, China.

F Corresponding author. Email: zhoubo8888899999@163.com

Functional Plant Biology 48(8) 743-754 https://doi.org/10.1071/FP20381
Submitted: 11 December 2020  Accepted: 13 February 2021   Published: 5 March 2021

Abstract

Lignin is a natural polymer interlaced with cellulose and hemicellulose in secondary cell walls (SCWs). Auxin acts via its signalling transduction to regulate most of plant physiological processes. Lignification responds to auxin signals likewise and affects the development of anther and secondary xylem in plants. In this review, the research advances of AUXIN RESPONSE FACTOR (ARF)-dependent signalling pathways regulating lignin formation are discussed in detail. In an effort to facilitate the understanding of several key regulators in this process, we present a regulatory framework that comprises protein–protein interactions at the top and protein–gene regulation divided into five tiers. This characterises the regulatory roles of auxin in lignin biosynthesis and links auxin signalling transduction to transcriptional cascade of lignin biosynthesis. Our works further point to several of significant problems that need to be resolved in the future to gain a better understanding of the underlying mechanisms through which auxin regulates lignin biosynthesis.

Keywords: auxin, anther endothecium, lignin biosynthesis, vessels, protein–protein interactions, secondary xylem, secondary cell walls.


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