02249naa a2200253 a 450000100080000000500110000800800410001910000190006024500680007926000090014750000930015652014170024965000360166665000310170265000260173365000130175965000220177265300180179470000230181270000220183570000260185770000200188377300920190319154712018-04-17       2011    bl uuuu     u00u1 u    #d1 aLIMA, J. A. A.  aSimple and multiple resistances to viruses in cowpea genotypes.  c2011  aTítulo em português: Resistência simples e múltipla a vírus em genótipos de caupi.  aThe objective of this work was to identify new sources of simple and multiple resistances to Cowpea severe mosaic virus (CPSMV), Cowpea aphid-borne mosaic virus (CABMV) and Cucumber mosaic virus (CMV) isolates in cowpea (Vigna unguiculata). Thirty-three genotypes from the germplasm bank of Universidade Federal do Ceará were tested as to their resistance to four CPSMV isolates, two CABMV isolates and one CMV isolate. Twenty-five days after the first virus inoculations, all inoculated plants, including the asymptomatic ones, were tested by serology. Genotypes were classified as: immune, plants without symptoms and negative serology; resistant, plants with mild mosaic and positive serology; susceptible, plants with mosaic and positive serology; and highly susceptible, plants with severe mosaic, other systemic symptoms, including systemic necrosis, and positive serology. Simple and multiple resistances to viruses were identified among the evaluated genotypes, but none of them showed multiple immunities to all isolates. Four genotypes showed immunity to all CPSMV isolates, two were immune to CABMV and two showed immunity to CMV. Eleven genotypes showed multiple resistances to two viruses, allowing for the development of new cultivars with more stable and broader resistance. Genotypes Purple Knuckle Hull-55, MNC-03-731C-21 and CNCx284-66E show resistance to CABMV, even when inoculated with CMV.  aCowpea aphid-borne mosaic virus  aCowpea severe mosaic virus  aCucumber mosaic virus  aserology  aVigna Unguiculata  aVirus control1 aSILVA, A. K. F. da1 aARAGÃO, M. do L.1 aFERREIRA, N. R. de A.1 aTEÓFILO, E. M.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 46, n. 11, p. 1432-1438, nov. 2011