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Transcriptional insights into the sugarcane-Sorghum mosaic virus interaction

Hui Ling  Ning Huang  Qibing Wu  Yachun Su  Qiong Peng  Waqar Ahmed  Shiwu Gao  Weihua Su  Youxiong Que  Liping Xu  
【摘要】:Mosaic disease is a major viral disease that severely compromises sugarcane production and results in decreased yield and sugar content.Among these,Sorghum mosaic virus(SrMV) is the most prevalent pathogen.To better understand the interaction mechanism between sugarcane and SrMV,two respective samples of SrMV-mfected and virus-free leaves of sugarcane cultivar ROC22 were deep sequenced using the Illumina HiSeq~(TM)2000 sequencing platform and the reliability of the sequencing data was confirmed by qRT-PCR in two SrMV-susceptible and two SrMV-resistant sugarcane cultivars.In total,89,338 unigenes,481 differentially expressed unigenes and 42 homologous sequences of Potyvirus host interactor(PHI) genes were obtained.The transcript profile of unigene indicated that,more unigenes were expressed in sugarcane leaf after SrMV infection.The analysis of differentially expressed unigenes suggested that,the increase of SrMV replication vesicles from endoplasmic reticulum(ER) to chloroplast led to chloroplasts damage,following initiation of Ca~(2+),ROS,cytokinin,auxin,and ethylene signaling,and also transcription of some defense related genes,such as pathogen-associated regulator NPR1.Among 42 PHIs,the upregulation of calmodulin-related protein gene and ethylene-inducible transcription factor gene could be found in all sugarcane cultivars under SrMV infection.Besides,heat shock protein 70 gene might be positively related and while chloroplastic rieske Fe/S protein gene was negatively related to the SrMV-resistance in four determined sugarcane cultivars.This study should help to understand the molecular mechanisms underlying SrMV-resistance of sugarcane cultivars.

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