Análise proteômica de raízes de feijão-de-corda (Vigna unguiculata), CV. CE-31, inoculadas com o nematóide das galhas (Meloydogine incognita)

Abstract

The cowpea [Vigna unguiculata (L.) Walp.] is an important leguminous used as food, being cultivated, mostly in arid African savannas , Asia and south of America, covering more over 12 millions of hectares, with annual production about 3 millions of tons. The cowpea it’s a culture greatly important in tropics zones characterized by low pluviometric precipitation, high temperature , gravely soils and poor fertility. Among the pathogenic organism that cause plant disease, the nematode, mainly Meloydogine sp. generate annual losses about several billions of dollars all over the world and the Meloidogyne incognita and Meloidogyne javanica species be the most damagers. One of the main cultures attacked by nematodes is the cowpea. Regard it, there is always needs to improve the knowledge about the relationship between host and pathogens aimed develop novels strategies to diminish eventual losses. The present work aimed identify the differential expression of proteins in Meloidogyne incognita resistant cowpea total roots and mitochondria roots cv Pitiúba (CE-31), inoculated and mock inoculated, using 2D electrophoresis assay associated with MS identification and gene expression analyses by semi-quantitative PCR. The results obtained showed at least 22 altered proteins in inoculated total roots and more 22 proteins of mitochondria roots, when compared with their respective controls and the top of alterations occurred next to 6° day after inoculation with pathogen. Mitochondria proteins cannot be identified reliability. Among the total roots proteins we can emphasize PR-1, 2 and 3, recognized as defense proteins, ascorbate peroxidase and superoxide dismutase (anti-oxidative brush enzymes) and a leghemoglobin, which can be the first report about this protein in this pathosystem. The gene expression analyses coincided with proteomics finds.