Premium
Registration of PR6555 Rice Germplasm Line with Moderate Resistance to Sheat Blight
Author(s) -
wick E. M.,
Groth D. E.
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/cropsci1989.0011183x002900040073x
Subject(s) - germplasm , blight , horticulture , biology , citation , resistance (ecology) , library science , humanities , agronomy , art , computer science
A fine-stemmed leafy switchgrass (Panicum virgatum L.) germplasm, KY 1625 (Reg. No. GP-57) (PI431575) was developed by the USDA Soil Conservation Service and released as germplasm in 1987 in cooperation with the Kentucky Agricultural Experiment Station. This germplasm is an increase of a strain that was collected in 1966 from Raleigh County, West Virginia, along the south side of the New River Alluvium, 1 km upriver from Highway 19 bridge, and accessioned KY 584. Seed from KY 584 was planted and selected from a collection of 35 other native switchgrass accessions at the Quicksand Plant Material Center from 1967 to 1970. In 1971, 20 clones were planted in a 5 m row for comparison with 51 switchgrass accessions that included the original 35, plus new accessions that included the cultivars Blackwell, Cave In Rock, Nebraska 28, Pathfinder, Wabasso, Pangburn, Kanlow, and Carthage. Evaluations were made to select for fine stems, leafy characteristics, and late maturity. KY 584 was the superior accession for these traits. Clonal material was increased from KY 584 and placed in a 0.04 ha field for seed increase and was designated KY 1625. Seed from the 0.04 ha plot was used to expand the increase field to a total of 1.14 ha. KY 1625 switchgrass is a perennial warm-season grass with a high leaf-to-stem ratio and has consistently shown higher protein and digestibility levels than other switchgrass accessions. According to an unpublished study at the University of Kentucky in 1986 by T.H. Taylor, R.O. Parriott, and L.T. Jones, Jr., KY 1625 showed the higher average percent total nonstructural carbohydrates over 3 yr than cultivars Blackwell, Cathage, and Kanlow. KY 1625 is more leafy and has finer stems than Kanlow or Blackwell; however, it has poor seed quality and seedling vigor (1). Cytogenetic studies of nine plants of KY 1625 indicated chromosome numbers of In = 36, 54, and 72. Apparently, both polyploidy and aneuploidy (x = 9 in switchgrass) may be present in this germplasm. This variability in chromosome number may account in part for the poor viable seed set. Area of adaptation is similar to that of other switchgrass strains. It has performed satisfactorily in plots for forage and on surface mine spoils in Kansas, Kentucky, Ohio, Pennsylvania, New York, New Jersey, North Dakota, and West Virginia. Seed will be maintained by the USDA-SCS Plant Materials Center at Quicksand, KY 41363. Small quantities of seed up to 500 g may be obtained upon request.