Transcriptomic profiling of dynamic alternative splicing during the early response to Ralstonia solanacearum infection in tobacco roots

Author:

Wu Xiuming,Geng Ruimei,Liu Zhengwen,Cheng Lirui,Jiang Caihong,Liu Dan,Yang Aiguo,Tong Ying,Chen Shuai,Sun Yangyang,Xiao Zhiliang,Ren Min

Abstract

AbstractThe pathogenic bacterium, Ralstonia solanacearum, causes bacterial wilt disease in many crops, which leads to significant yield losses worldwide. Although genes associated with resistance to this pathogen have been isolated and characterized in crops, the molecular mechanisms underlying the plant–pathogen interactions remain to be elucidated. Here, we performed a comparative transcriptional profiling analysis of tobacco (Nicotiana tabacum) cultivars C048 (susceptible) and C244 (resistant) in response to R. solanacearum infection. We found that the number of down- and up-regulated genes increased dramatically 3 h post inoculation (hpi), peaked 24 hpi, and then decreased 48 and 72 hpi, representing a “transcriptomic shock”. Of these genes, those associated with biotic and abiotic stresses and secondary metabolism were up-regulated, whereas those associated with primary metabolism were down-regulated. Alternative splicing (AS) modulates root defense against R. solanacearum by fine-tuning gene expression during the transcriptomic responses to pathogen invasion. The numbers of skipped exon (SE) and mutually exclusive exon (MXE) type AS events were reduced by approximately 60–80% in roots 9–72 hpi compared to those occurring 0–3 hpi. On the contrary, the number of differential alternative splicing (DAS) events showing a change in isoform ratio between samples increased, and most of them were associated with the down-regulation of corresponding gene expression. In addition, genes encoding transcription factors and leucine-rich repeat domain proteins that showed changes in both expression level and AS profile during pathogen infection were identified. Our study offers novel insights into the mechanisms underlying the transcriptional and post-transcriptional regulation of the tobacco response to R. solanacearum infection and will benefit the molecular breeding of pathogen-resistant tobacco in the future.

Funder

Tobacco Genome Project

Central Public-interest Scientific Institution Basal Research Fund

Publisher

Springer Science and Business Media LLC

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3