Root-Specific Role for Nicotiana benthamiana RDR6 in the Inhibition of Chinese wheat mosaic virus Accumulation at Higher Temperatures
文献类型： 外文期刊
作者： Andika, Ida Bagus 1 ; Sun, Liying 1 ; Xiang, Rong 2 ; Li, Junmin 1 ; Chen, Jianping 1 ;
作者机构： 1.Zhejiang Acad Agr Sci, State Key Lab Breeding Base Zhejiang Sustainable, Minist Agr, Key Lab Biotechnol Plant Protect,Inst Virol & Bio, Hangzhou 310021, Zhejiang, Peoples R China
2.Zhejiang Normal Univ, Coll Chem & Life Sci, Jinhua 321004, Peoples R China
期刊名称：MOLECULAR PLANT-MICROBE INTERACTIONS （ 影响因子：4.171； 五年影响因子：4.836 ）
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收录情况： SCI
摘要： Some viruses only infect plants at cool temperatures but the molecular mechanism underlying this low-temperature dependence remains unclear. Chinese wheat mosaic virus (CWMV, genus Furovirus) was able to infect wheat and Nicotiana benthamiana plants at 16 but not at 24 degrees C. When CWMV-infected plants were transferred to 24 degrees C for 2 weeks, the newly emerged leaves and roots became virus free. Co-infection with Potato virus Y rescued CWMV accumulation in N. benthamiana plants after a temperature shift to 24 degrees C. In transgenic N. bentizamiana plants silenced for the N. benthamiana RNA-dependent RNA polymerase 6 (NbRDR6), CWMV was able to accumulate in roots but not in leaves after a temperature shift to 24 degrees C. Deep sequencing of small RNAs showed that, at 16 degrees C, abundant CWMV small interfering (si)RNAs accumulated in infected N. benthamiana plants. Silencing of NbRDR6 increased the abundance of CWMV siRNAs and the generation of siRNAs from hotspots in the CWMV genome. In contrast, when shifted to 24 degrees C for 1 week, CWMV siRNAs were markedly fewer in roots of NbRDR6-silenced than in roots of wildtype plants but were similar in the leaves of those plants. Our results demonstrate the root-specific role of NbRDR6 in the inhibition of CWMV accumulation and biogenesis of CWMV siRNAs at higher temperatures.
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