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Registration of Five Spring Wheat Germplasm‐Lines with Improved Resistance to Common Root Rot ( Cochliobolus Sativus )
Author(s) -
Tinline R. D.,
Harding H.,
Depauw R. M.
Publication year - 1989
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/cropsci1989.0011183x002900040078x
Subject(s) - germplasm , cochliobolus sativus , swift , crop , horticulture , spring (device) , biology , resistance (ecology) , library science , geography , agronomy , cultivar , physics , computer science , astrophysics , thermodynamics
eny of the X,, designated series DX, were tested for resistance to S. nodorum and S. tritici in the greenhouse as seedlings and in the field as adult plants at Bozeman, MT. Resistant selections were examined cytologically in Stillwater, OK to confirm a normal (27V = 42) chromosomal complement. These lines, pedigree Vona/72-52 X, were tested in the field at Bozeman, MT in 1984, and the X4 generation was increased for release in 1988. Heading at Bozeman, MT normally occurs on 10 June; height is 100 cm; test weight is 67 kg/hL; and yield is 3.4 T/ha. This may be compared to Centurk, which has an average heading date of 20 June; height of 105 cm; test weight of 77 kg/hL; and yield of 4.9 T/ha. The disease reactions of the lines in the field relative to the reaction of Centurk are indicative of their levels of resistance to the two Septoria spp. and to the local stripe rust (Puccinia striiformis) inoculum (Table 1). Some of the component lines that comprise this bulk germplasm have been tested in the USDA International Septoria Nursery, and have shown various, but useful, levels of resistance to Septoria populations in several parts of the world. This bulk should be valuable for improving levels of resistance to either S. nodorum or S. tritici. Germplasm amounts of seed are available from A.L. Scharen, USDA-ARS, Department of Plant Pathology, Montana State University, Bozeman, MT 59717. Seed will also be available from the USDA-ARS Small Grain Collection at Aberdeen, ID, when that facility becomes operational.