NDLI: Identification and expression analysis of WRKY family genes under biotic and abiotic stresses in Brassica rapa

Content Provider	Springer Nature Link
Author	Kayum, Md. Abdul Jung, Hee Jeong Park, Jong In Ahmed, Nasar Uddin Saha, Gopal Yang, Tae Jin
Copyright Year	2014
Abstract	WRKY proteins constitute one of the largest transcription factor families in higher plants, and they are involved in multiple biological processes such as plant development, metabolism, and responses to biotic and abiotic stresses. Genes of this family have been well documented in response to many abiotic and biotic stresses in many plant species, but not yet against Pectobacterium carotovorum subsp. carotovorum and Fusarium oxysporum f.sp. conglutinans in any of the plants. Moreover, potentiality of a specific gene may vary depending on stress conditions and genotypes. To identify stress resistance-related potential WRKY genes of Brassica rapa, we analyzed their expressions against above-mentioned pathogens and cold, salt, and drought stresses in B. rapa. Stress resistance-related functions of all Brassica rapa WRKY (BrWRKY) genes were firstly analyzed through homology study with existing biotic and abiotic stress resistance-related WRKY genes of other plant species and found a high degree of homology. We then identified all BrWRKY genes in a Br135K microarray dataset, which was created by applying low-temperature stresses to two contrasting Chinese cabbage doubled haploid (DH) lines, Chiifu and Kenshin, and selected 41 BrWRKY genes with high and differential transcript abundance levels. These selected genes were further investigated under cold, salt, and drought stresses as well as after infection with P. carotovorum subsp. carotovorum and F. oxysporum f.sp. conglutinans in B. rapa. The selected genes showed an organ-specific expression, and 22 BrWRKY genes were differentially expressed in Chiifu compared to Kenshin under cold and drought stresses. Six BrWRKY genes were more responsive in Kenshin compared to Chiffu under salt stress. In addition, eight BrWRKY genes showed differential expression after P. carotovorum subsp. carotovorum infection and five genes after F. oxysporum f.sp. conglutinans infection in B. rapa. Thus, the differentially expressed BrWRKY genes might be potential resources for molecular breeding of Brassica crops against abiotic and biotic stresses and several genes, which showed differential expressions commonly in response to several stresses, might be useful for multiple stress resistance. These findings would also be helpful in resolving the complex regulatory mechanism of WRKY genes in stress resistance and for this further functional genomics study of these potential genes in different Brassica crops is essential.
Starting Page	79
Ending Page	95
Page Count	17
File Format	PDF
ISSN	16174615
Journal	Molecular and General Genetics MGG
Volume Number	290
Issue Number	1
e-ISSN	16174623
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-23
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	WRKY genes Biotic stress Abiotic stress Brassica Cell Biology Biochemistry Microbial Genetics and Genomics Plant Genetics & Genomics Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Molecular Biology

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