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Int. J. Mol. Sci. 2015, 16(4), 7608-7626; doi:10.3390/ijms16047608

The WRKY Transcription Factor Genes in Eggplant (Solanum melongena L.) and Turkey Berry (Solanum torvum Sw.)

1,†
,
2,†
,
1
,
1,* , 1
and
1
1
College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
2
DNA Stories Bioinformatics Services Co., Ltd., Chengdu 610000, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Ritva Tikkanen
Received: 6 November 2014 / Revised: 2 March 2015 / Accepted: 10 March 2015 / Published: 7 April 2015
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
View Full-Text   |   Download PDF [2466 KB, uploaded 7 April 2015]   |  

Abstract

WRKY transcription factors, which play critical roles in stress responses, have not been characterized in eggplant or its wild relative, turkey berry. The recent availability of RNA-sequencing data provides the opportunity to examine WRKY genes from a global perspective. We identified 50 and 62 WRKY genes in eggplant (SmelWRKYs) and turkey berry (StorWRKYs), respectively, all of which could be classified into three groups (I–III) based on the WRKY protein structure. The SmelWRKYs and StorWRKYs contain ~76% and ~95% of the number of WRKYs found in other sequenced asterid species, respectively. Positive selection analysis revealed that different selection constraints could have affected the evolution of these groups. Positively-selected sites were found in Groups IIc and III. Branch-specific selection pressure analysis indicated that most WRKY domains from SmelWRKYs and StorWRKYs are conserved and have evolved at low rates since their divergence. Comparison to homologous WRKY genes in Arabidopsis revealed several potential pathogen resistance-related SmelWRKYs and StorWRKYs, providing possible candidate genetic resources for improving stress tolerance in eggplant and probably other Solanaceae plants. To our knowledge, this is the first report of a genome-wide analyses of the SmelWRKYs and StorWRKYs. View Full-Text
Keywords: Solanum torvum sw.; Solanum melongena L.; WRKY transcriptional factor Solanum torvum sw.; Solanum melongena L.; WRKY transcriptional factor
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

Yang, X.; Deng, C.; Zhang, Y.; Cheng, Y.; Huo, Q.; Xue, L. The WRKY Transcription Factor Genes in Eggplant (Solanum melongena L.) and Turkey Berry (Solanum torvum Sw.). Int. J. Mol. Sci. 2015, 16, 7608-7626.

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