Host-delivered RNAi-mediated root-knot nematode resistance in Arabidopsis by targeting splicing factor and integrase genes

Springer Science and Business Media LLC - Tập 83 - Trang 91-97 - 2017
Anil Kumar1,2, Atul Kakrana1,3, Anil Sirohi4, K. Subramaniam5, R. Srinivasan1, M. Z. Abdin2, Pradeep K. Jain1
1ICAR-NRC on Plant Biotechnology, New Delhi, India
2Department of Biotechnology, Faculty of Science, Centre for Transgenic Plant Development, Jamia Hamdard, New Delhi, India
3Center for Bioinformatics and Computational Biology, University of Delaware, Newark, USA
4Division of Nematology, ICAR-Indian Agricultural Research Institute, New Delhi, India
5Department of Biotechnology, Indian Institute of Technology, Madras, Chennai, India

Tóm tắt

Root-knot nematodes (RKNs) are one of the most important biotic factors limiting crop productivity in many crop plants. The major RKN control strategies include development of resistant cultivars, application of nematicides and crop rotation, but each has its own limitations. In recent years, RNA interference (RNAi) has become a powerful approach for developing nematode resistance. The two housekeeping genes, splicing factor and integrase, of Meloidogyne incognita were targeted for engineering nematode resistance using a host-delivered RNAi (HD-RNAi) approach. Splicing factor and integrase genes are essential for nematode development as they are involved in RNA metabolism. Stable homozygous transgenic Arabidopsis lines expressing dsRNA for both genes were generated. In RNAi lines of splicing factor gene, the number of galls, females and egg masses was reduced by 71.4, 74.5 and 86.6%, respectively, as compared with the empty vector controls. Similarly, in RNAi lines of the integrase gene, the number of galls, females and egg masses was reduced up to 59.5, 66.8 and 63.4%, respectively, compared with the empty vector controls. Expression analysis revealed a reduction in mRNA abundance of both targeted genes in female nematodes feeding on transgenic plants expressing dsRNA constructs. The silencing of housekeeping genes in the nematodes through HD-RNAi significantly reduced root-knot nematode infectivity and suggests that they will be useful in developing RKN resistance in crop plants.

Tài liệu tham khảo

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