REAÇÃO DA CULTIVAR CZ48B32 IPRO DE SOJA À Pratylenchus sp.

Abstract

The objective of this study was to evaluate the reaction of the soybean cultivar CZ 48B32 IPRO to Pratylenchus sp. Samples composed of 300cm3 of soil were collected (0-20 cm deep) in an area cultivated with soybean in Rio Verde - GO. To multiply the nematodes, they were extracted from the soil and root for quantification using the flotation-sedimentation-sieving method, followed by centrifugation. This contaminated soil was placed in pots containing susceptible soybeans. After 60 days, the experiment was installed in a completely randomized design, where 5-liter pots were filled with substrate mixed with 600 cm3 of soil each, on 03/12/2022 containing soil contaminated by Pratylenchus sp. Cultivar CZ48B32 IPRO plants were transplanted into pots 15 days after emergence. After 60 days of inoculation, laboratory analyzes were performed with soil and root extraction, calculating the reproduction factor. If greater than 1, the cultivar is said to be susceptible and less than 1, it is resistant. The cultivar CZ 48B32 IPRO proved to be resistant to the root lesion nematode.