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Sources and Inheritance of Resistance to Phytophthora megasperma var. sojae in Soybeans 1
Author(s) -
LamSanchez A.,
Probst A. H.,
Laviolette F. A.,
Schafer J. F.,
Athow K. L.
Publication year - 1968
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/cropsci1968.0011183x000800030020x
Subject(s) - phytophthora megasperma , biology , backcrossing , inoculation , phytophthora sojae , phytophthora , resistance (ecology) , botany , inheritance (genetic algorithm) , phycomycetes , horticulture , gene , genetics , agronomy
Inheritance of resistance to Phytophthora megasperma var. sojae in soybeans was studied in a group of crosses involving nine resistant varieties, originally from fairly diverse geographical areas. Each of eight resistant varieties was crossed to the ninth, ‘Mukden,’ or one of its resistant backcross derivatives (‘Lindarin 63’ or ‘Clark 63’), and seven also were crossed to the susceptible varieties ‘Wabash,’ ‘Lindarin,’ or ‘Clark.’ From inoculation tests performed on F 3 progenies of F 2 plants of crosses between susceptible x resistant parents, monohybrid segregations were obtained, indicating that the resistance to phytophthora rot of soybeans is conditioned by a single dominant gene in each case. Inoculation tests on F 2 populations of crosses between resistant parents gave no segregation, suggesting that all resistant parents have Mukden‐type resistance reported by Bernard et al. (1) and assigned the gene Rps (formerly Ps ).