Transcriptome-wide identification of novel circular RNAs in soybean in response to low-phosphorus stress

Autoři: Lingling Lv aff001;  Kaiye Yu aff001;  Haiyan Lü aff001;  Xiangqian Zhang aff001;  Xiaoqian Liu aff001;  Chongyuan Sun aff001;  Huanqing Xu aff001;  Jinyu Zhang aff002;  Xiaohui He aff003;  Dan Zhang aff001
Působiště autorů: Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, China aff001;  Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, China aff002;  Smart City Institute, Zhengzhou University, Zhengzhou, China aff003
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article


Low-phosphorus (LP) stress is a major factor limiting the growth and yield of soybean. Circular RNAs (circRNAs) are novel noncoding RNAs that play a crucial role in plant responses to abiotic stress. However, how LP stress mediates the biogenesis of circRNAs in soybean remains unclear. Here, to explore the response mechanisms of circRNAs to LP stress, the roots of two representative soybean genotypes with different P-use efficiency, Bogao (a LP-sensitive genotype) and Nannong 94156 (a LP-tolerant genotype), were used for the construction of RNA sequencing (RNA-seq) libraries and circRNA identification. In total, 371 novel circRNA candidates, including 120 significantly differentially expressed (DE) circRNAs, were identified across different P levels and genotypes. More DE circRNAs were significantly regulated by LP stress in Bogao than in NN94156, suggesting that the tolerant genotype was less affected by LP stress than the sensitive genotype was; in other words, NN94156 may have a better ability to maintain P homeostasis under LP stress. Moreover, a positive correlation was observed between the expression patterns of P stress-induced circRNAs and their circRNA-host genes. Gene Ontology (GO) enrichment analysis of these circRNA-host genes and microRNA (miRNA)-targeted genes indicated that these DE circRNAs were involved mainly in defense responses, ADP binding, nucleoside binding, organic substance catabolic processes, oxidoreductase activity, and signal transduction. Together, our results revealed that LP stress can significantly alter the genome-wide profiles of circRNAs and indicated that the regulation of circRNAs was both genotype and environment specific in response to LP stress. LP-induced circRNAs might provide a rich resource for LP-responsive circRNA candidates for future studies.

Klíčová slova:

Gene expression – Gene regulation – Long non-coding RNAs – MicroRNAs – Phosphates – Plant resistance to abiotic stress – RNA sequencing – Soybean


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