Genetics of resistance to soybean cyst nematode, Heterodera glycines ichione (Race 3), in a brazilian soybean population

Mauro, Antônio Orlando Di; Oliveira, Antonio Luiz de; Mauro, Sônia Marli Zingaretti Di

doi:10.1590/s1415-47571999000200021

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…HG Type 0 and HG Type 7 were found in 94 and 6% of tested populations, respectively. According to surveys of H. glycines races conducted in most soybean-growing areas in the world, race 3 is the most common race in the USA (Sikora & Noel, 1991;Niblack et al, 1993Niblack et al, , 2003Chen et al, 2001), in Japan (Riggs & Schmitt, 1991) and in Brazil (Mauro et al, 1999). The field populations of H. glycines in Iran seem to be less variable compared to other SCN populations in the world.…”

Section: Discussionmentioning

confidence: 99%

Distribution, population density, race and type determination of soybean cyst nematode, Heterodera glycines, in Iran

Salati¹,

Riggs

Maafi

2008

Nematol

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The soybean cyst nematode (SCN), Heterodera glycines, found in most soybean growing regions in the world, is considered the most economically damaging pathogen of soybean worldwide. A survey conducted in the northern provinces of Mazandaran and Golestan, the main soybean-producing areas in Iran, revealed SCN was widespread in different localities of these regions. Of the 55 and 88 soil samples collected from soybean fields in Mazandaran and Golestan provinces, respectively, ten (18.8%) and 23 (26%) samples were infested with H. glycines; the population densities of second-stage juveniles (J2) and eggs ranged from 500 to 60 000 and 500 to 100 000 per 250 cm 3 soil, respectively. These population densities of H. glycines are indicative of reductions in soybean yield. HG Type tests were conducted on 16 field populations. HG Type 0 (race 3) was the most common with 94% frequency, whereas HG Type 7 (race 6) was found in 6% of tested populations. Most populations of H. glycines parasitised PI88788 and PI548316. Eight of the most commonly used soybean cultivars were tested against H. glycines HG Type 0; seven of them, Sepideh, Sahar (Pershing), Gorgan 3, Williams 82, JK (Sari), BP (Telar) and Hill, had high female indices and were considered susceptible to HG Type 0. Only the cultivar DPX showed low female indices and was resistant to race 3. The initial observations showed that the first life cycle of SCN required 30-34 days in early-planted fields (late May and early June), whereas in late-planted fields (early July), white females were visible 20 days after planting. Several generations could be expected in a single growing season under field conditions in northern Iran.

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Section: Discussionmentioning

confidence: 99%

Distribution, population density, race and type determination of soybean cyst nematode, Heterodera glycines, in Iran

Salati¹,

Riggs

Maafi

2008

Nematol

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“…Dominance effects were also ascertained to be important by several earlier researchers in the determination of resistance to NCS races 1 (Qiu et al, 1997;Yue et al, 2000), 2 (Yue et al, 2000), 3 (Matson & Williams, 1965;Rao-Arelli et al, 1992b;Rao-Arelli, 1994;Qiu et al, 1997;Di Mauro et al, 1999;Yue et al, 2000), 5 (Myers & Anand, 1991;Anand, 1994;Qiu et al, 1997;Yue et al, 2000) and 14 (Thomas et al, 1975;Yue et al, 2000) of SCN.…”

Section: Estimating Genetic Parameters Of Means and Variancesmentioning

confidence: 99%

“…This was most likely due to the presence of main-effect resistance genes. The presence of these genes justifies the use of qualitative methods in most studies on inheritance of resistance to H. glycines (Caldwell et al, 1960;Matson & Williams, 1965;Thomas et al, 1975;Hancock et al, 1987;Myers & Anand, 1991;Rao-Arelli et al, 1992a;Anand, 1994;Rao-Arelli, 1994;Young & Killen, 1994;Qiu et al, 1997;Di Mauro et al, 1999;Yue et al, 2000).…”

Section: Estimating the Number Of Genesmentioning

confidence: 99%

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Genetic control in soybean of resistance to soybean cyst nematode race 4+

et al. 2005

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Race 4 + refers to a population of soybean cyst nematode (SCN), Heterodera glycines, identified for the first time in Brazil, which differs from the classic race 4 for its ability to infect the cv. Hartwig, but not its ancestor PI 437654. Studies were carried out at Embrapa Soybean in Londrina, PR State, Brazil. Resistant genotypes E97-2502-9-3-1 and E97-2502-9-3-5 (types PI 437654) were crossed to the susceptible parent E96-776 (type 'Hartwig') to obtain 20 F 1 plants, 120 F 2 plants and 120 F 2:3 families. The greenhouse trials involved those generations plus 20 plants of each parental genotype. Seedlings of each generation and of the race-differential cultivars were transplanted to clay pots and inoculated with 4000 eggs. After 28 days, the root system of each plant was washed and the females collected and counted. The inoculations resulted in high numbers of females in the susceptible genotypes in both crosses, confirming the presence of race 4 + . The genetic analysis revealed no reciprocal cross effects, but some transgressive segregation with partial dominance toward resistance, and heritability estimates of medium to high magnitude. Resistant control in cross E96-776 × E97-2502-9-3-1 involved expression of additive, dominant and additive × additive epistatic effects, which suggests the presence of at least two genes. A single-gene hypothesis sufficed to explain the observed segregation in the E96-776 × E97-2502-9-3-5 cross with a simple additive-dominant model showing good fit to the data. The i-locus (expressing black seedcoat color) was associated with resistance.

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“…The control of the resistance to SCN in the cultivar Peking by three recessive genes, was reported by Caldwell et al (1960), while Matson and Williams (1965) identified only one dominant gene. Mauro et al (1999) identified one dominant gene and two recessive genes together controlling the resistance to race 3 in one line derived from the crossing of the cultivar FT-Cristalina (susceptible) and the line BR-904722, with resistance to race 3 acquired from the cultivar Peking.…”

Section: Inheritance Of Resistance Of Scnmentioning

confidence: 99%

Molecular markers linked to the resistance to race 3 of the soybean cyst nematode Heterodera glycines

Carvalho

Abdelnoor²,

Almeida³

et al. 2002

CBAB

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The objective of this study was to identify molecular markers associated with the resistance to race 3 of the SCN. Two microsatellites (Satt187 and Satt309) and three RAPD markers (OPAG-05 946 , OPF-04 1038 , and OPAQ-01 1987 ) were found which explained 31.3%, 28.9%, 13.8%, 11.4% and 9.9%, respectively, of the phenotypic resistance variation to race 3 of the SCN. However, by multiple regression analysis, with the elimination of markers which least contributed to an explanation of the resistance, the most significant combination occurred with the inclusion of the markers Satt187 and Satt309, which together explained 75.2% of the resistance. These markers were mapped in two distinct regions. One located in the linkage group G with the markers OPAG-05 846, OPF-04 1038 , OPAQ-01 1987 and Satt309 at an interval of 34.7 cM, and another located in the group A 2 with the marker Satt187. Inheritance studies have shown those two dominant genes control resistance to SCN, in the population analyzed.

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Genetics of resistance to soybean cyst nematode, Heterodera glycines ichione (Race 3), in a brazilian soybean population

Cited by 4 publications

References 9 publications

Distribution, population density, race and type determination of soybean cyst nematode, Heterodera glycines, in Iran

Distribution, population density, race and type determination of soybean cyst nematode, Heterodera glycines, in Iran

Genetic control in soybean of resistance to soybean cyst nematode race 4+

Molecular markers linked to the resistance to race 3 of the soybean cyst nematode Heterodera glycines

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