Reação de cultivares de soja a Meloidogyne incognita e M. javanica
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Data
2013-02-28
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Universidade Federal de Goiás
Resumo
Soybean has great economic importance for Brazil, which is among the major
producing countries. The crop is attacked by various pathogens and among them are the
nematodes of the genera Meloidogyne that can reduce the yeld. Among the various
methods of control the use of resistant cultivars is one of them, but there are several
cultivars still without information about its reaction to this genera of nematodes. In this
study we evaluated the response of soybean cultivars to Meloidogyne incognita race 3 and
Meloidogyne javanica, and the penetration of these nematodes in soybean cultivars
exposed to different inoculoum concentrations. The experiments were conducted in a
greenhouse installed at the Universidade Federal de Goiás, Goiânia, GO. Seeds were
planted into a sterilized substrate and the seedlings were inoculated with M. incognita or
M. javanica eggs and J2. In assessing the cultivars response to the nematodes we evaluated
the population density (eggs and J2/10 g root) and reproduction factor (RF) at 60 days after
inoculation. In another experiment the penetration of nematodes was observed at 10 days
after inoculation by counting the number of J2 and J3 within the plant tissue. 45 days after
inoculation the population density (eggs and J2/10 g root) was also evaluated. M. incognita
had the RF < 1,0 in most of the cultivars tested and M. javanica had RF > 1,0 in all the
cultivars. By using Moura & Régis (1987) criteria fifteen cultivars were ranked as resistant
or highly resistant and none as registant to M. javanica. In general, the increase of
inoculum concentration increased the amount of nematodes in the roots.
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Teixeira, R. A. Reação de cultivares de soja a Meloidogyne incognita e M. javanica. 2013. 63 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2013.