Secondary amplification of siRNA machinery limits the application of spray-induced gene silencing

Molecular Plant Pathology
Xiu-Shi SongMingguo Zhou

Abstract

Spray-induced gene silencing (SIGS) is an innovative strategy for crop protection. However, the mechanism of SIGS is not known. Here, we first demonstrate that secondary small interfering RNA (siRNA) amplification limits the application of SIGS. A myosin5 gene (Myo5) was chosen as the target of SIGS in an agronomically important pathogen-Fusarium asiaticum. Five segments corresponding to the different regions of the Myo5 gene were found to efficiently silence Myo5, resulting in cell wall defects, life cycle disruption and virulence reduction. Myo5-8 (one of the Myo5 segments) induced sequence-specific RNA interference (RNAi) activity in F. asiaticum, F. graminearum, F. tricinctum and F. oxysporum, but not in other fungi, in vitro. Remarkably, the silencing of Myo5 lasted for only 9 h unless the double-stranded RNA (dsRNA) was continuously supplied, because F. asiaticum is unable to maintain siRNA amplification. After spraying on plants, dsRNAs were more efficiently taken up via the wounded surface. The antifungal activity of dsRNAs taken up by plant cells was higher and longer lasting than that dried onto the plant surface. In contrast with dsRNAs in fungi, dsRNAs in plant cells could efficiently turn into substantial siRNAs vi...Continue Reading

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Citations

May 11, 2019·International Journal of Molecular Sciences·Alexandra S Dubrovina, Konstantin V Kiselev
Nov 20, 2019·Pest Management Science·Clauvis Nji Tizi TaningGuy Smagghe
Sep 25, 2019·Current Pharmaceutical Biotechnology·Tianzhong LiMengsu Yang
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Apr 3, 2019·International Journal of Molecular Sciences·Alexandra S DubrovinaKonstantin V Kiselev
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May 18, 2021·Current Opinion in Biotechnology·Ena Šečić, Karl-Heinz Kogel
Jul 4, 2021·Current Opinion in Biotechnology·Dongdong NiuHailing Jin

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