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Genes 2015, 6(3), 901-917; doi:10.3390/genes6030901

Identification of 4CL Genes in Desert Poplars and Their Changes in Expression in Response to Salt Stress

State Key Laboratory of Grassland Agro-Ecosystem, School of Life Sciences, Lanzhou University, No.222, Tianshui Southern Road, Lanzhou 730000, China
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: J. Peter W. Young
Received: 23 July 2015 / Revised: 31 August 2015 / Accepted: 7 September 2015 / Published: 18 September 2015
(This article belongs to the Section Population and Evolutionary Genetics and Genomics)
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Abstract

4-Coumarate:CoA ligase (4CL) genes are critical for the biosynthesis of plant phenylpropanoids. Here we identified 20 4CL genes in the genomes of two desert poplars (Populus euphratica and P. pruinosa) and salt-sensitive congener (P. trichocarpa), but 12 in Salix suchowensis (Salix willow). Phylogenetic analyses clustered all Salicaceae 4CL genes into two clades, and one of them (corresponding to the 4CL-like clade from Arabidopsis) showed signals of adaptive evolution, with more genes retained in Populus than Salix and Arabidopsis. We also found that 4CL12 (in 4CL-like clade) showed positive selection along the two desert poplar lineages. Transcriptional profiling analyses indicated that the expression of 4CL2, 4CL11, and 4CL12 changed significantly in one or both desert poplars in response to salt stress compared to that of in P. trichocarpa. Our results suggest that the evolution of the 4CL genes may have contributed to the development of salt tolerance in the two desert poplars. View Full-Text
Keywords: 4CL gene family; desert poplars; adaptive evolution; expression divergence; salt stress 4CL gene family; desert poplars; adaptive evolution; expression divergence; salt stress
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, C.-H.; Ma, T.; Luo, W.-C.; Xu, J.-M.; Liu, J.-Q.; Wan, D.-S. Identification of 4CL Genes in Desert Poplars and Their Changes in Expression in Response to Salt Stress. Genes 2015, 6, 901-917.

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