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Inheritance of Resistance to the Javanese Root‐Knot Nematode in Soybean
Author(s) -
Luzzi Bruce M.,
Tamulonis John P.,
Hussey Richard S.,
Boerma H. Roger
Publication year - 1995
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1995.0011183x003500050019x
Subject(s) - biology , meloidogyne javanica , gall , heritability , nematode , botany , transgressive segregation , root knot nematode , population , cultivar , quantitative trait locus , horticulture , gene , genetics , ecology , demography , sociology
The inheritance of resistance in soybean [ Glycine max (L.) Merr.] to the javanese root‐knot nematode [ Meloidogyne javanica (Treub) Chitwood] was determined for crosses of a susceptible genotype, ‘CNS’, with three resistant genotypes, ‘Gordon’, PI80466, and PI230977. For each cross, F 1 , F 2 , and/or F 3 populations were screened in a greenhouse for resistance to gall formation by counting individual galls on the roots of plants inoculated with nematode eggs. The distribution of galls for each F 2 and/or F 3 population was continuous. Variance component heritability estimates for the three crosses ranged from 0.23 to 0.51 on a plot basis and 0.48 to 0.76 on a mean basis. The correlation between gall number on F 2 plants and mean gall number on F 3 progeny (heritability on a plant basis) was 0.26 for CNS × Gordon and 0.29 for CNS × PI230977. These data suggest that resistance to M. javanica in Gordon, PI80466, and PI230977 is quantitatively inherited. The uniqueness of resistance genes was determined for crosses among Gordon, PI80466, and PI230977. Segregation for gall number within F 2 populations and significant differences (P 0.05) among F 3 families from each cross indicated that each resistant parent may possess M. javanica resistance genes at different loci or different alleles at the same loci. This information can be used to more efficiently develop soybean cultivars with a high level of resistance to M. javanica .