Abstract
ABSTRACT The aim of this study was to assess resistance to some of the major sweet pepper pathogens {Phytophthora capsici, Pepper yellow mosaic virus (PepYMV) and Meloidogyne incognita} in a group of experimental hybrids and their respective parental lines, and to identify hybrids possibly resistant to all three pathogens. Ten parental breeding lines, thirty experimental hybrids and seven commercial controls (Konan-R, Magali-R, Martha-R, Stephany, Mallorca, Magnata Super and Criollo de Morelos-334) were used. Each experiment was set up in a randomized complete block design with three replications and plots consisting of 16 plants. For assessment of resistance to P. capsici and PepYMV, the percent of asymptomatic plants was considered. In evaluating reactions to M. incognita, both the nematode reproduction index and the nematode reproduction factor were calculated. Five hybrids were found with resistance to all three pathogens. For all three pathogens, there was evidence that hybrids with two resistant parental lines showed slightly higher levels of pathogen resistance than those with only one resistant parental line.
Highlights
O objetivo deste trabalho foi caracterizar híbridos experimentais de pimentão e suas linhagens parentais, quanto às reações de resistência a Phytophthora capsici, Pepper yellow mosaic virus (PepYMV) e Meloidogyne incognita, e identificar híbridos possivelmente resistentes a esses três patógenos
Meloidogyne incognita may lead to the greatest damage in sweet pepper because it occurs most frequently in crop fields (Lopes & Ávila, 2003)
PIX-044B-01-01, PIX-044B-13-01, PIX-045B-27-02, PIX-045B-32-03, PIX-052B-06-01 and PIM-013 did not differ from the resistant control Criollo de Morelos-334 in regard to reaction to P. capsici, but they differed significantly in regard to the susceptible control Magnata Super, and were considered resistant to the pathogen (Table 2)
Summary
O objetivo deste trabalho foi caracterizar híbridos experimentais de pimentão e suas linhagens parentais, quanto às reações de resistência a Phytophthora capsici, Pepper yellow mosaic virus (PepYMV) e Meloidogyne incognita, e identificar híbridos possivelmente resistentes a esses três patógenos. Para os três patógenos foram encontradas evidências de que híbridos com duas linhagens parentais resistentes apresentam níveis de resistência ligeiramente superiores àqueles com apenas uma linhagem parental resistente. Meloidogyne incognita may lead to the greatest damage in sweet pepper because it occurs most frequently in crop fields (Lopes & Ávila, 2003). Genetic resistance to these plant pathogens is one of the most efficient ways of minimizing damages, as well as having less impact on the environment. Genetic resistance to these plant pathogens may be exploited in hybrid combinations because studies show that genetic control of resistance is usually due to the presence of dominant alleles, with monogenic inheritance
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