Screening of resistance to Meloidogyne arenaria in wild accessions of Arachis SPP. from Embrapa Recursos Genéticos e Biotecnologia Germplasm Bank.
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Embrapa Recursos Genéticos e Biotecnologia holds a germplasm bank of more than a thousand accessions of Arachis spp. This genetic material can be a valuable source of resistance to Arachis pests in traditional breeding, and also be used to clone resistance genes for direct introduction into cultivars by genetic transformation. In this work, we searched for resistance sources to the plant parasitic nematode Meloidogyne arenaria. A bioassay was performed with M. arenaria race 2 collected in Gramado, RS. Five thousand eggs and 1200 second stage juveniles (J2) were used to inoculate accessions of A. stenosperma, A. duranensis, A. cardenasii and the cultivated A. hypogea cv. Tatu. Both resistant and susceptible responses were found in different accessions of A. stenosperma and A. duranensis. The single accession of A. cardenasi tested was resistant to this nematode species. The A. hypogea cv. Tatu showed low levels of infection. Since the species tested are from the section Arachis which is sexually compatible with A. hypogea, the resistant accessions could be used in traditional breeding programs. We intend to screen more accessions with different Arachis pests, and also, to create diploid populations which segregate for multiple resistances. These population will be used, together with a genetic approach to clone the resistance genes, which could be directly transferred into other cultivated species.
Na publicação: S. Leal Bertioli, R. G. Carneiro.; P. Guimarães.
Na publicação: S. Leal Bertioli, R. G. Carneiro.; P. Guimarães.
Palabras clave
Resistance, Meloidogyne Arenaria, Arachis