Abstract
Several root-knot nematode (Meloidogyne spp.) resistance genes have been discovered in different pepper (Capsium annuum L.) lines; however, none of them has yet been cloned. In this study, a candidate root-knot nematode resistance gene (designated as CaMi) was isolated from the resistant pepper line PR 205 by degenerate PCR amplification combined with the RACE technique. Expression profiling analysis revealed that this gene was highly expressed in roots, leaves, and flowers and expressed at a lower level in stems and was not detectable in fruits. To verify the function of CaMi, a sense vector containing the genomic DNA spanning the full coding region of CaMi was constructed and transferred into root-knot nematode susceptible tomato plants. Sixteen transgenic plants carrying one to five copies of T-DNA inserts were generated from two nematode susceptible tomato cultivars. RT-PCR analysis revealed that the expression levels of CaMi gene varied in different transgenic plants. Nematode assays showed that the resistance to root-knot nematodes was significantly improved in some transgenic lines compared to untransformed susceptible plants, and that the resistance was inheritable. Ultrastructure analysis showed that nematodes led to the formation of galls or root knots in the susceptible lines while in the resistant transgenic plants, the CaMi gene triggered a hypersensitive response (HR) as well as many necrotic cells around nematodes.
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Acknowledgments
The authors would like to thank Dr. Zhangjun Fei for critical review of this manuscript and Ms. Michelle Yu and Ms. Chitti Dharmanolla for proofreading. This research was supported by grant from the National Natural Science Foundation of P.R. China (30671416), Doctorate Program of University of Ministry of Education (200504028) and National Advanced Technology Research and Development Plan of China (AA212221).
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Communicated by P. Lakshmanan.
Rugang Chen and Hanxia Li are contributed equally to this work.
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Chen, R., Li, H., Zhang, L. et al. CaMi, a root-knot nematode resistance gene from hot pepper (Capsium annuum L.) confers nematode resistance in tomato. Plant Cell Rep 26, 895–905 (2007). https://doi.org/10.1007/s00299-007-0304-0
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DOI: https://doi.org/10.1007/s00299-007-0304-0