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J Integr Plant Biol, 59 (7): 496-505, Research Article
A zinc finger protein, interacted with cyclophilin, affects root development via IAA pathway in rice
Peng Cui1,2, Hongbo Liu2*, Songlin Ruan3, Basharat Ali1, Rafaqat Ali Gill1, Huasheng Ma3, Zhifu Zheng2 and Weijun Zhou1*
1Institute of Crop Science and Zhejiang Key Laboratory of Crop Germplasm, Zhejiang University, Hangzhou, China
2College of Agriculture and Food Science, Zhejiang A & F University, Lin'an 311300, China
3Plant Molecular Biology and Proteomics Lab, Institute of Biotechnology, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, China
**Correspondences: E-mail: Weijun Zhou (wjzhou@zju.edu.cn Dr. Zhou is fully responsible for the distribution of all materials associated with this article) ; Hongbo Liu (hbliu@zafu.edu.cn)
Abstract

The plant hormone auxin plays a crucial role in lateral root development. To better understand the molecular mechanisms underlying lateral root formation, an auxin-responsive gene OsCYP2 (Os02g0121300) was characterized from rice. Compared to the wild type, OsCYP2-RNAi (RNA interference) lines exhibited distinctive defects in lateral root development. Yeast two-hybrid and glutathione S-transferase pull-down results confirmed that OsCYP2 interacted with a C2HC-type zinc finger protein (OsZFP, Os01g0252900) which is located in the rice nucleus. T2 OsZFP-RNAi lines had significantly fewer lateral roots than did wild-type plants, which suggests a role for OsCYP2 and OsZFP in regulating lateral root development. Quantitative real-time polymerase chain reaction showed that the expression of certain Aux/IAA (auxin/indole-3-acetic acid) genes was altered in OsCYP2- and OsZFP-RNAi lines in response to IAA. These findings imply that OsCYP2 and OsZFP participate in IAA signal pathways controlling lateral root development. More importantly, OsIAA11 showed functional redundancy not only in OsCYP2-RNAi lines but also in OsZFP-RNAi lines, which provides important clues for the elucidation of mechanisms controlling lateral root development in response to auxin.

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Received: 04 November 2016      Published: 07 March 2017
© 2017 Institute of Botany, Chinese Academy of Sciences
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