Characterization of rust, early and late leaf spot resistance in wild and cultivated peanut germplasm

Scientia Agricola

Alessandra Pereira Fávero²  Sérgio Almeida De Moraes¹  Antonio Augusto Franco Garcia¹  José Francisco Montenegro Valls²  Natal Antonio Vello¹ 

[1] ,Embrapa Recursos Genéticos e Biotecnologia SAIN Parque Estação Biológica Brasília DF ,Brasil

关键词: Puccinia arachidis;    Cercospora arachidicola;    Cercosporidium personatum;    groundnut;    Arachis spp;    Puccinia arachidis;    Cercospora arachidicola;    Cercosporidium personatum;    Arachis spp;   

DOI  :  10.1590/S0103-90162009000100015

来源: SciELO

【 摘 要 】

Groundnut (Arachis hypogaea) has an AB genome and is one of the most important oil crops in the world. The main constraints of crop management in Brazil are fungal diseases. Several species of the genus Arachis are resistant to pests and diseases. The objective of our experiments was to identify wild species belonging to the taxonomic section Arachis with either A or B (or " non-A" ) genomes that are resistant to early leaf spot (Cercospora arachidicola), late leaf spot (Cercosporidium personatum) and rust (Puccinia arachidis). For the identification of genotypes resistant to fungal diseases, bioassays with detached leaves were done in laboratory conditions, with artificial inoculation, a controlled temperature of 25ºC and a photoperiod of 10 h light/14 h dark, for 20-42 days, depending on the fungi species. Most of the accessions of wild species were more resistant than accessions of A. hypogaea for one, two or all three fungi species studied. Arachis monticola, considered to be a possible tetraploid ancestor or a derivative of A. hypogaea, was also more susceptible to Cercosporidium personatum and Puccinia arachidis, as compared to most of the wild species. Therefore, wild germplasm accessions of both genome types are available to be used for the introgression of resistance genes against three fungal diseases of peanut.

【 授权许可】

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