Seleção de genótipos de soja resistentes a raças de Heterodera glycines e a Pratylenchus brachyurus
Data
2014-12-04
Autores
Silva, Samara Lorâine Soares da
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Universidade Federal de Mato Grosso
Resumo
The nematodes are among the factors that contribute for decrease in of
soybean production mainly in the central region of the country. Although the culture is
attacked by various nematodes Heterodera glycines e Pratylenchus brachyurus
worth mentioning, by difficulty in finding resistant cultivars P. brachyurus by the
various existing physiological races of H. glycines. Faced of this scenario the
objective with the present study select soybean genotypes resistant to races 1, 2, 4,
5, 6 and 14 H. glycines and P. brachyurus. The experiments were conducted in a
greenhouse in a completely randomized design. The first in a factorial design 18 x 6
corresponding to soybean genotypes and races of soybean cyst nematode and the
second with 12 soybean genotypes for resistance to P. brachyurus, both with five
replications. The genetic material consisted of promising breeding genetic lineage of
soybean, University Federal of Uberlândia program. Were included the differential
cultivars Peking, Pickett, PI 88788, PI 90763, Lee Hartwig and 74 were included for
characterization of races and Pintado, Conquista and crotalaria as patterns of
susceptibility and resistance of P. brachyurus. Each experimental drive has been
represented by two plants grown in a vase with a capacity of 1.5 dm3 of soil,
containing a mixture of soil and sand in the proportion (2: 1). After seven days after
sowing the seedlings were inoculated with their suspensions of 5 mL containing 3000
eggs and juveniles of H. glycines in the first experiment and 600 specimens of P.
brachyurus second experiment in the root 2 cm hypocotyl. Were analyzed: plant
height, stem diameter, chlorophyll index Falker and dry weight of shoot for H.
glycines. After 30 days of inoculation with H. glycines, the roots were carefully
removed from the vases for counting females and estimate the resistance index
based on females. For P. brachyurus at 90 to days after inoculation the root system
was removed for recovery nematode and calculated the reproduction factor
calculated for each genotype. The genotypes UFUS 6901 and UFUS Mineira were
moderately resistant to race 5 and 6, respectively .In relation to the nematode
Genotypes UFUS 119, UFUS Guará, UFUS 6901, UFUS Tapajós, UFUS 8401,
UFUS 7401, Villa Rica, UFUS 32 and UFUS 37 were statistically equal to the
standard Crotalaria of the nematode resistance, and unfavorable or poorly suited to
playing Pratylenchus spp.
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SILVA, Samara Lorâine Soares da. Seleção de genótipos de soja resistentes a raças de Heterodera glycines e a Pratylenchus brachyurus. 2014. 90 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2014.