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Differential Expression and Regulation of Switchgrass Root MicroRNA in Response to alkali-salt stress Using High-throughput Deep Sequencing

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Journal of Northeast Agricultural University(English Edition) 2020年第2期27卷 81-89页

作者： Liu Jian Wang Qian-nan Guo Xin Duo Tian-qi Li Ran Hu Guo-fu Zhang Xun-zhong College of Animal Sciences and Technology Northeast Agricultural UniversityHarbin150030China School of Plant and Environmental Science Virginia TechBlacksburgVAUSA24061

Switchgrass(Panicum virgatum L.)as a high-quality bioenergy crop that can effectively improve saline-alkali soil has strong resistance to stress and grows well in marginal soil and some abiotic stress *** study used alkali-sensitive genotype AM(AM-314/MS-155)and alkali-tolerant genotype ALA(Alamo)as experimental materials to investigate molecular mechanisms of switchgrass tolerance to alkali-salt *** the plants were grown to E5 stage,the alkali-salt stress treatment was carried out by soaking method(Na2CO3:NaHCO3=1:9,C(Na+)=150 mmol·L-1 and pH=9.0)and fresh root samples were taken after treatments for 0(CK),6 and 24 h,respectively,the differentially expressed microRNAs and their regulatory network were analyzed.A total of 1049 known miRNAs and 68 novel miRNAs were ***-two differentially expressed miRNAs in ALA were more than three times higher than those in AM and 36.1%differentially expressed miRNAs was significantly down-regulated(palkali-salt stress,differentially expressed miRNAs in AM were mainly involved in the regulation of cellular ROS clearance,ethylene signal transduction,and root,leaf and flower *** in ALA were also involved in water transport,DNA methylation,response to high osmotic pressure,activation of stress-related genes and more complex responses to alkali-salt stress processes,but those in AM were *** was significantly higher than AM in the number of microRNAs responding to alkali-salt stress and in the functional diversity of their regulatory target genes.

关键词： miRNA alkali-salt stress high-throughput sequencing switchgrass

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