Genome-wide identification of Thellungiella salsuginea microRNAs with putative roles in the salt stress response
文献类型: 外文期刊
第一作者: Zhang, Quan
作者: Zhang, Quan;Sun, Wei;Liu, Yan;Wang, Xingjun;Zhao, Yanxiu;Zhao, Chuanzhi;Li, Ming;Xia, Han;Sun, Mingnan;Li, Aiqin;Li, Changsheng;Zhao, Shuzhen;Hou, Lei;Picimbon, Jean-Francois;Wang, Xingjun
作者机构:
关键词: Thellungiella salsuginea;Salt stress;miRNA identification;Solexa sequencing;Expression analysis
期刊名称:BMC PLANT BIOLOGY ( 影响因子:4.215; 五年影响因子:4.96 )
ISSN: 1471-2229
年卷期: 2013 年 13 卷
页码:
收录情况: SCI
摘要: Background: MicroRNAs are key regulators of plant growth and development with important roles in environmental adaptation. The microRNAs from the halophyte species Thellungiella salsuginea (salt cress), which exhibits extreme salt stress tolerance, remain to be investigated. The sequenced genome of T. salsuginea and the availability of high-throughput sequencing technology enabled us to discover the conserved and novel miRNAs in this plant species. It is interesting to identify the microRNAs from T. salsuginea genome wide and study their roles in salt stress response. Results: In this study, two T. salsuginea small RNA libraries were constructed and sequenced using Solexa technology. We identified 109 miRNAs that had previously been reported in other plant species. A total of 137 novel miRNA candidates were identified, among which the miR* sequence of 26 miRNAs was detected. In addition, 143 and 425 target mRNAs were predicted for the previously identified and Thellungiella-specific miRNAs, respectively. A quarter of these putative targets encode transcription factors. Furthermore, numerous signaling factor encoding genes, defense-related genes, and transporter encoding genes were amongst the identified targets, some of which were shown to be important for salt tolerance. Cleavage sites of seven target genes were validated by 5' RACE, and some of the miRNAs were confirmed by qRT-PCR analysis. The expression levels of 26 known miRNAs in the roots and leaves of plants subjected to NaCl treatment were determined by Affymetrix microarray analysis. The expression of most tested miRNA families was up-or down-regulated upon NaCl treatment. Differential response patterns between the leaves and roots were observed for these miRNAs. Conclusions: Our results indicated that diverse set of miRNAs of T. salsuginea were responsive to salt stress and could play an important role in the salt stress response.
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