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Registration of DM‐1 Sunflower Germplasm Composite Resistant to Race 3 Downy Mildew
Author(s) -
Gulya Thomas J.,
Miller Jerry F.
Publication year - 1985
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/cropsci1985.0011183x002500040057x
Subject(s) - downy mildew , germplasm , sunflower , geneticist , miller , library science , biology , mildew , race (biology) , horticulture , botany , computer science , genetics , ecology
PI 430541), from the Soviet Union. Initial screening of the sunflower collection indicated approximately 19% of Progress plants were resistant to race 3. Eighteen resistant plants were identified, and self-pollinated in the greenhouse. The same procedure utilized for DM-2 was used to develop DM3. S2 seed from 84 individual plants was planted in the winter nursery. Forty-seven of the 84 S2 lines were completely resistant to the race 3 isolate. Plants from S3 seed were tested in the spring of 1983 with 111 verified as resistant. Five seedlings per resistant line were transplanted into the field during the summer of 1983. Two of the five plants were treated with 50 pprn of GA3 to achieve male sterility. Pollen from the remaining fertile plants was collected in one bag and applied to all male-sterile plants. A composite was made by bulking seed from the randommated (male-sterile) plants. The plants from the S3 seed verified as completely resistant from both the Novinka and Progress sources were included in the DM-1 source of race 3, downy mildew resistant germplasm. In genetic studies, plants from Novinka and Progress were found to have a single, dominant gene controlling resistance to race 3, downy mildew. This gene, however, does not impart resistance to race 2 or the Red River race of downy mildew. Studies have been initiated to determine whether the DM-2 and DM-3 sources have the same or different gene as other sources reported resistant to race 3. Limited quantities of seed of each germplasm source are available from the Seedstocks Project, Agronomy Dep., North Dakota State Univ., Fargo, ND, 58105.