Obtenção de híbridos de pimentão com resistência a nematóides de galhas Meloidogyne incognita

Abstract

The sweet pepper breeding line PIX-027F-01-09-01 bears the Me1 alelle for resistance to races 1, 2, 3 and 4 of Meloidogyne incognita and Meloidogyne javanica, and was issued in crosses with lines PIM-003, PIM-013, PIM-016 and Myr-29. These four hybrids, presumable nematode resistance, were tested along with four susceptible hybrids of similar backgrounds and with four commercial hybrid check treatments. Evaluations were carried out in greenhouses, in soil naturally infected with Meloidoigyne incognita. There were significant differences among treatments for all traits under study, except for early and total yields. The hybrids with higher mean fruit mass (in early and total yields) were Laser (168,3g e 206,1g) and the nematode-susceptible hybrid F1(PIM-013xLinha-004), 167,7g e 201,4g, which also showed the highest fruit length. The hybrid with lower mean fruit mass was F1(PIX-027F-01-09-01xPIM-003) with 89,7g and 101,6g for early-yield and total yield mean fruit mass, respectively; this was also the hybrid with shortest fruit length, and one of hybrids with largest fruit width. For nematode-related traits, all four hybrids with PIX-027F-01-09-01 as a common parent were indeed more resistant to M. incognita than their susceptible counterparts with line-004 (susceptible) as parent. The commercial hybrid checks were higher in mean fruit mass, fruit length, fruit width, fruit shape score and gall index, than the mean of the 8 experimental hybrids. Data support the hypothesis that the deployment of F1 hybrids, heterozygous for the Me1 alelle, is efficient towards reducing nematode incidence.