Resistance evaluation of corn genotypes to Meloidogyne graminicola
Abstract
The reaction of 18 corn genotypes (FepagroRS 21, FepagroRS 22, AM4001, AM4002, AM4003, AM4004, AM4005, BRS4103, BRS1002, BRSCaimbé, BRSMissões, BRSPlanalto, Fundacep 35, SCS 154 Fortuna, SCS 156 Colorado and SCS155 Catarina, PMS1641A08 and PMS1635A08) to Meloidogyne graminicola (VS1) was evaluated at green house conditions. Seedlings of the different genetic materials grown in pots with sterilized soil, were inocu- lated with 5.000 eggs + J2 of M. incognita/plant. Seedlings of ‘Santa Cruz’ tomato plants were used as controls. The experiment was carried out under a randomized design with six replications. Fifty-five days after the inoculation, the plant resistance was evaluated by counting the gall number egg number and nematode reproduction factor (RF = final population / initial population) determination. The host reaction of each cultivar was rated according to RF, as immune RF = 0,00, resistant RF < 1,00 and susceptible RF > 1,00. No galls were found at corn roots on none of the evaluated genotypes. The ‘AM 4001’, ‘BRS 1002’, ‘SCS154Fortuna’, and ‘BRS 4103’, genotypes were resistant to M. graminicola, and the other genetic materials behaved as immune to the nematode, whereas the control presented a great number of galls in the roots and permitted a high nematode reproduction factor (RF = 73,54).
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