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Open AccessArticle

GmIDL2a and GmIDL4a, Encoding the Inflorescence Deficient in Abscission-Like Protein, Are Involved in Soybean Cell Wall Degradation during Lateral Root Emergence

College of Bioscience and Biotechnology, Shenyang Agricultural University, Shenyang 110086, China
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Int. J. Mol. Sci. 2018, 19(8), 2262; https://doi.org/10.3390/ijms19082262
Received: 7 June 2018 / Revised: 19 July 2018 / Accepted: 22 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Pollen Tube and Plant Reproduction)
The number of lateral roots (LRs) of a plant determines the efficiency of water and nutrient uptake. Soybean is a typical taproot crop which is deficient in LRs. The number of LRs is therefore an important agronomic trait in soybean breeding. It is reported that the inflorescence deficient in abscission (IDA) protein plays an important role in the emergence of Arabidopsis LRs. Previously, the genes which encode IDA-like (IDL) proteins have been identified in the soybean genome. However, the functions of these genes in LR development are unknown. Therefore, it is of great value to investigate the function of IDL genes in soybean. In the present study, the functions of two root-specific expressed IDL genes, GmIDL2a and GmIDL4a, are investigated. The expressions of GmIDL2a and GmIDL4a, induced by auxin, are located in the overlaying tissue, where LRs are initiated. Overexpression of GmIDL2a and GmIDL4a increases the LR densities of the primary roots, but not in the elder root. Abnormal cell layer separation has also been observed in GmIDL2a- and GmIDL4a-overexpressing roots. These results suggest that the overlaying tissues of GmIDL2a- and GmIDL4a-overexpressing roots are looser and are suitable for the emergence of the LR primordium. Further investigation shows that the expression of some of the cell wall remodeling (CWR) genes, such as xyloglucan endotransglucosylase/hydrolases, expansins, and polygalacturonases, are increased when GmIDL2a and GmIDL4a are overexpressed in hairy roots. Here, we conclude that GmIDL2a and GmIDL4a function in LR emergence through regulating soybean CWR gene expression. View Full-Text
Keywords: soybean; IDA-like protein; cell wall remodeling genes; lateral root development soybean; IDA-like protein; cell wall remodeling genes; lateral root development
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Liu, C.; Zhang, C.; Fan, M.; Ma, W.; Chen, M.; Cai, F.; Liu, K.; Lin, F. GmIDL2a and GmIDL4a, Encoding the Inflorescence Deficient in Abscission-Like Protein, Are Involved in Soybean Cell Wall Degradation during Lateral Root Emergence. Int. J. Mol. Sci. 2018, 19, 2262.

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