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Registration of ‘Calhoun’ Soybean
Author(s) -
Pfeiffer T. W.
Publication year - 1994
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/cropsci1994.0011183x003400050058x
Subject(s) - citation , library science , biology , humanities , computer science , philosophy
'Calhoun' soybean [Glycine max (L.) Men.] (Reg. no. CV-322, P1576440) was developed by the Kentucky Agricultural Experiment Station. It was released in 1993 because of its superiority in seed yield in both full-season and double-crop plantings compared with the most widely grown public cultivars in Kentucky. Calhoun originated as an F4 plant selection from the cross 'Ripley' (2) X 'Pershing' (1). The cross was made in the greenhouse and the Fr plants were grown in the field at the Kentucky Agricultural Experiment Station in 1983. The seeds were advanced from the F2 to the F4 generation by modified single-seed descent (harvesting one pod per plant, followed by subsampling to maintain a constant population size) at the Iowa State University soybean breeding nursery at the University of Puerto Rico, Isabela Substation. The F4 plant selection was made in 1984 in Lexington, KY. The Fa-derived line was evaluated for seed yield in Kentucky from 1987 through 1992 and in the Uniform Soybean Tests Northern States (Group IV) in 1989 and 1990 under the designation KY85-09073 (4). Calhoun is a determinate Maturity Group IV cultivar (relative maturity 4.4) that matures = 2 I d later than Ripley and 5 d earlier than 'Pennyrile' (3). Its latitude of adaptation for full-season production is about 36.5° to 40° N. Mature plants of Calhoun are = 8 cm taller than those of Ripley; lodging resistance is similar for the two cultivars. Plants of Calhoun have purple flowers, gray pubescence, and tan pod walls. Seeds are yellow with buff hila and a positive seed peroxidase activity. Seed size is 10% larger than that of Ripley. Seeds of Calhoun have acceptable protein and oil concentrations, »410 g kg" protein and 210 g kg" oil on a dry weight basis. Seed yield of Calhoun was 6% higher than Ripley in 42 state and regional tests and 3.5% higher than Pennyrile in 60 state and regional tests. Calhoun is resistant to Race 1 and susceptible to Race 7 of phytophthora rot (4) (caused by Phytophthora sojae M.J. Kaufmann & J.W. Gerdemann). It is also susceptible to the soybean cyst nematode (Heterodera glytines Ichinohe). U.S. Plant Variety Protection will be applied for. Foundation seed was distributed for planting in 1993. Breeder seed will be maintained by the Kentucky Foundation Seed Project, Kentucky Agricultural Experiment Station, Lexington, KY 405460091. Small quantities of seed for research purposes may be obtained from the author for a minimum of 5 yr.