Ciência e Agrotecnologia
Print version ISSN 1413-7054
NASCIMENTO, Ildon Rodrigues do et al. Reaction of hybrids, lines and progenies of sweet pepper the blight caused by Phytophthora capsici and to Pepper yellow mosaic virus (PepYMV ). Ciênc. agrotec. [online]. 2007, vol.31, n.1, pp. 121-128. ISSN 1413-7054. http://dx.doi.org/10.1590/S1413-70542007000100018.
Resistance to pepper blight induced by Phytophthora capsici and to yellow mosaic caused by a potyvirus species (PepYMV) are two priorities of most pepper (Capsicum annuum L.) breeding programmes in Brazil. The reactions of three commercial hybrids (Magali-R, Atenas F1, and Fortuna Super F1) to both P. capsici and PepYMV was studied, along with those of 20 experimental hybrids, 6 inbred lines and two F2:4 progenies from the Universidade Federal of Lavras pepper breeding programme. Trials in randomized complete block designs were carried out independently for each of the pathogens, with four and two replications, respectively. Each replications comprised 8 plants in 128-cell speeding styrofoam trays, kept in plastic-covered greenhouses protected with screen at the sides. Evaluation of symptoms was made from the 4th to the 14th and from the 15 th to the 40th day after inoculation (DAI) for P. capsici and PepYMV, respectively. Inoculation with P. capsici was made by dispensing 5mL of a 104 zoospore.mL-1 solution at the soil around the base of each plant. PepYMV was mechanically inoculated from extracts of previously infected leaves of TNN tobacco. Hybrids Magali-R and Fortuna Super were susceptible to P. capsici, while the hybrid Atenas, the access Criollo de Morellos 334, the progeny PIX-030 pl#03-2 and PIX-030 pl#06-3 (both originated from crosses with Criollo de Morellos), and the line PIM-013 were resistant. Among the experimental hybrids, three were also resistant to P. capsici, all three having PIM-013 as one of the parental lines. Resistance to PepYMV was found in Criollo de Morellos 334, progeny PIX-030 pl#03-2 and PIX-030 pl#06-3, and in the commercial hybrid Magali, besides 6 other experimental hybrids having line MYR-29 as one of the parental ines. The only treatment with resistance to both P. capsici and PepYMV were families PIX-030 pl#03-2 and PIX-030 pl#06-3, and the experimental hybrid F1(PIM-013 x MYR-29). Progeny PIX-030 pl#03-2 and PIX-030 pl#06-3 proved to be promissing sources of resistance to both pathogens to be deployed in breeding programmes. PIM-013 and MYR-29 are promissing sources of resistance to P. capsici and PepYMV, respectively, to be deployed in development of hybrids with resistance to these pathogens.
Keywords : Capsicum annuum; potyvirus; resistance; bligh.